JPH0372437B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an anchor bolt core press-in machine used for fixing an anchor bolt embedded in a concrete wall or the like after the anchor bolt is embedded.

[Technical background of the invention and its problems]

As an anchor bolt to be embedded in a concrete wall (floor) or concrete block, a slit is made at the tip of the embedded side to form multiple (usually 4) lip parts, and a core rod is driven into the top of the bolt head. A type of implant is known in which the lip portion is expanded and deformed by advancing, thereby fixing the implanted side.

Conventionally, the method of embedding and fixing this type of anchor bolt is to first embed the anchor bolt with the bolt part protruding from the wall (floor) by a predetermined length, and then use a hammer etc. to tighten the core. The head of the rod was struck to move the core rod forward, causing the lip to expand and deform.

Alternatively, a method was used in which a screw hole was provided in the casing tip of a press-fitting device equipped with a hydraulic piston mechanism, the bolt part of the anchor bolt was screwed into the screw hole, and the core rod was press-fitted by moving the piston rod forward. .

However, in the method of driving with a hammer, the driving force increases considerably as the diameter of the anchor bolt increases, making driving work extremely difficult when embedded in walls, ceilings, etc., and also requiring accuracy in the driving direction. It has the disadvantage that it is difficult to securely fix it.

Furthermore, in the press-fitting method using a conventional press-fitting device, it is necessary to replace the attachment every time the diameter of the bolt changes, and the connection is troublesome, resulting in poor workability. Furthermore, since the state in which the core rod is pushed in cannot be seen, it is impossible to confirm whether or not it has been completely pushed in, making it difficult to securely fix the core rod.

[Purpose of the invention]

The present invention has been made with these points in mind, and it is possible to securely attach anchor bolts of various sizes.
It is an object of the present invention to provide a core rod press-fitting machine for anchor bolts that can be easily fixed.

[Summary of the invention]

The present invention provides a casing body with a built-in hydraulic drive mechanism, a press-fitting piston rod that protrudes from the front end surface of the casing body so as to be movable forward and backward and comes into contact with the head of a core rod of an anchor bolt, and a piston rod that is screwed onto the anchor bolt. The anchor bolt clamp mechanism has a stepped contact part that contacts the outer circumference and side surface of the nut, and a nut holding part that fixes and holds the nut while it is in contact with the contact part, and the anchor bolt clamp mechanism is attached to the casing body. The present invention relates to an anchor bolt core rod press-in machine comprising a support member that is fixedly held at a front position spaced a predetermined distance from the front end surface of the anchor bolt and has a space in which the core rod can be accommodated.

According to the present invention, the anchor bolt clamp mechanism fixes and holds the nut screwed onto the anchor bolt, and moves the pressure piston rod forward to push in the core rod of the anchor bolt. According to the present invention, the work can be performed with one touch, the work is easy, and anchor bolts of various sizes can be securely fixed.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a side sectional view of a core rod press-fitting machine for anchor bolts according to the present invention. In the figure, reference numeral 11 denotes an electric motor, which is attached to the casing body 13 with the motor shaft 12 inserted into the casing body 13. An oil tank 14 in which oil is stored is provided inside the casing body 13, and a pump mechanism 15 for pumping the oil in the oil tank 14 is also provided. The pump mechanism 15 includes a cam portion 16 formed at the tip of the motor shaft 12, a piston 17 that is reciprocated by the cam portion 16 via a needle bearing, and an on-off valve 18 disposed in an oil passage. , this on-off valve 18
Normally, a spring 19 closes off the oil passage. A cylinder chamber 20 is formed approximately in the center of the casing body 13, and the cylinder chamber 20 and the oil tank 14 are partitioned off by a vertical wall 21. There are a plurality of pump mechanisms 15 (for example, three).
Except for one pump mechanism 15 (shown in the upper position in FIG. 1), the other pump mechanisms 15a
An oil supply passage 22 for supplying pressure oil from (indicated by a chain line at the bottom in FIG. 1) passes through the vertical wall 21 and communicates with the cylinder chamber 20. Cylinder chamber 20
The oil tank 14 is communicated with the oil tank 14 by a communication passage 23 provided through the vertical wall 21, and a spool valve mechanism 24 is disposed in the middle of the communication passage 23. The spool valve mechanism 24 functions to open and close the communication passage 23, and creates a minute gap (for example, 0.1mm
The spool 26 is configured to be slidably disposed in the axial direction with a diameter gap of 1, and a spring 27 is disposed within the cylindrical cylinder 25 so as to come into contact with the tip of the spool 26. The cylindrical cylinder 25 has a cylinder chamber 20 and an oil tank 1 at the front position.
The valve seat 28 has a valve seat 28 formed in the middle of a communication passage 23 that communicates with the pump mechanism 4, and a passage 29 that communicates with one of the pump mechanisms 15 of the plurality of pump mechanisms is opened at the rear. Moreover, at the tip of the spool 26,
A valve body 30 is formed to open and close the valve seat 28 in the cylindrical cylinder 25 . When the pump mechanism 15 does not operate, the spool 26 is connected to the spring 2
7, the rear end is pushed up until it comes into contact with the stopper 31. An oil tank 14 is installed on the vertical wall 21.
An oil return path 32 that communicates with the front end (end opposite to the vertical wall 21) of the cylinder chamber 20 is formed through the oil return path 32. It branches into a buffer chamber 34. A pressure buffer chamber 34 is formed within the handle 35 of the hoop wrench. Further, a release hole 36 communicating with the pressure buffer chamber 34 is bored at an appropriate position closer to the front end than the middle of the cylinder chamber 20 .

Inside the cylinder chamber 20, a piston flange 37 is provided.
is arranged to be slidable in the axial direction, and a piston rod 38 is joined to the back surface of this piston flange 37. The piston rod 38 is used to push in the core rod (center pin) C of the anchor bolt B, and protrudes from the front end surface 13a of the casing body 13 so as to be movable forward and backward. Further, a recessed portion having a shape corresponding to the head H of the core rod C is formed in the front end surface 38a of the piston rod 38 so that the piston rod 38 can reliably abut against the head H of the core rod C.
Back side of piston flange 37 and casing body 1
A piston flange return spring 47 is disposed between the piston flange return spring 47 and the front end surface 13a of the piston flange.

A support member 39 having a substantially semicircular cross section is fixed to the front end surface 13a of the casing body 13, and fixes and holds the anchor bolt clamp mechanism 40 at a forward position separated from the front end surface 13a of the casing body by a predetermined distance. The support member 39 has a shape like a hollow cylindrical member cut in half, and has a space 39a in which the core rod C can be accommodated.

The anchor bolt clamp mechanism 40 includes a stepped structure and a substantially semicircular cross-section contact portion 41 that contacts the outer periphery and front side surface of the nut N screwed onto the anchor bolt B; The nut holding part 42 is fixedly held in a state in which it is in contact with the nut holding part 41. The nut holding section 42 includes a pair of balls 43 that abut against the outer periphery (preferably a circumferential groove is formed) of a pair of nuts N disposed at opposite positions, and a ball 43 that contacts the outer periphery of the nut N. It is provided with a spring 44 that elastically presses against the portion. Further, the spring 44 is backed up by a screw member 45 having a concave cross section, and the spring force can be adjusted by moving the screw member 45 forward and backward.

Next, the operation of this embodiment having such a configuration will be explained.

First, a pilot hole of a predetermined depth is made in the concrete wall (floor) W, and the anchor bolt B is inserted. A nut N of the required size is screwed onto the protrusion of the anchor bolt B from the wall surface. As for this nut N, it is desirable to prepare one having the same outer circumferential diameter and the same axial thickness regardless of the thread size for each thread size.

Next, the core rod press-fitting machine is moved relative to the anchor bolt B from a direction perpendicular to the axial direction of the anchor bolt B, and the nut N is held by the anchor bolt clamp mechanism 40. This holding of the nut N involves moving the nut N relatively between the pair of balls 43 and the spring 44, bringing the outer periphery and side surface of the nut N into contact with the abutment part 41, and the spring 4
This is done by pressing and clamping the ball 43 against the outer periphery of the nut N with a force of 4. After setting the core rod press-fitting machine to the anchor bolt B in this manner, the switch 11a of the electric motor 11 of the core rod press-fitting machine is turned on.

The motor shaft 12 is driven to rotate by driving the electric motor 11, and the cam 16 also rotates. This causes the piston 17 to reciprocate, sucking and compressing the oil in the oil tank 14 to generate pressure oil. Pump mechanism 1
The pressure oil generated by the pump mechanism 5 pushes up the on-off valve 18 against the spring 19, and is sent under pressure to the spool valve mechanism 24 through the passage 29, while the pressure oil generated by the other pump mechanism 15a is supplied to the spool valve mechanism 24. Road 2
2 into the cylinder chamber 20. The pressure oil fed to the spool valve mechanism 24 is fed from the rear of the cylindrical cylinder 25 and pushes the spool 26 forward against the spring 27. Spool 26
, the valve body 30 at the tip moves into the cylindrical cylinder 2.
The opening of the valve seat 28 is closed. As a result, the oil tank 14 and the cylinder chamber 2
The communication path 23 communicating with 0 is blocked and closed. Subsequently, the pressure oil that is force-fed into the cylindrical cylinder 25 from the pump mechanism 15 flows through the gap between the spool 26 and the inner diameter of the cylindrical cylinder 25, and flows into the oil tank 14.
through the communication path 23. As a result, the spool valve mechanism 24 maintains the communication path 23 between the oil tank 14 and the cylinder chamber 20 in a blocked state.

The pressure oil fed into the cylinder chamber 20 acts on the flange surface of the piston flange 37 and moves the piston flange 37 and the piston rod 38 to the left in FIG. 1 against the return spring 47. As a result, the front end surface 38a of the piston rod 38 comes into contact with the head H of the core rod C, and the core rod C is pushed into the anchor bolt B. FIG. 3 shows the state in which the core rod C is pushed in. By pushing the core rod C, the slit S at the embedded end of the anchor bolt B is opened, and each lip portion T is expanded and deformed to bite into the concrete wall W. During this pushing operation of the core rod C, the reaction force of the pushing force of the piston rod 38 is supported by the anchor bolt clamp mechanism 40 and the support member 39, which fix and hold the nut N screwed onto the anchor bolt B. Therefore, the anchor bolt B inserted into the prepared hole is not pushed into the concrete wall any further, and the length of the bolt portion protruding outside the concrete wall can be maintained at a predetermined dimension. There is no need to cause unnecessary deformation of the anchor bolt B.

When the core rod C is pushed in sufficiently until the head H of the core rod C contacts the rear end of the anchor bolt B, the switch 11a is turned off and the operation of the electric motor 11 is stopped. The pushing state of the core rod C can be easily monitored by the operator since the support member 39 is formed into a half-split shape.

By stopping the operation of the electric motor 11,
The supply of pressure oil from the pump mechanism 15 is stopped,
The spool 26 of the spool valve mechanism 24 is pushed back rearward by the spring 27, and the engagement between the valve body 30 and the valve seat 28 is released. Cylinder chamber 20 and oil tank 1
4 through the communication passage 23, the pressure oil in the cylinder chamber 20 is returned to the oil tank 14, and the piston flange 37 and piston rod 38 are pushed back to the right in FIG. 1 by the return spring 47.

By completing the pushing operation of the core rod C as described above and moving the core rod press-fitting machine in a direction perpendicular to the axial direction of the anchor bolt B, the state in which the nut N is held by the anchor bolt clamp mechanism 40 is released. The core rod press-in machine can be removed from the anchor bolt B.

Although an example of a combination of a ball and a spring that elastically supports the ball has been shown as the nut holding portion, it may also be a leaf spring that elastically abuts on the outer periphery of the nut. Furthermore, as the means for holding the nut, a screw member whose tip abuts against the outer circumference of the nut may be used.

〔Effect of the invention〕

As explained above, according to the present invention, the core rod of the anchor bolt can be easily and reliably press-fitted and the anchor bolt can be fixed. Furthermore, since the pushing reaction force of the core rod can be received by the nut screwed onto the anchor bolt, the bolt head of the anchor bolt can be fixed in a state of protruding from the concrete wall (floor) surface by an arbitrary dimension. This makes it possible to always obtain an accurate anchor bolt embedment state. Furthermore, since the support member and anchor bolt clamping mechanism have a half-split structure, it is easy to set the core rod press-fitting machine to the anchor bolt, and the state of pressing the core rod can be monitored, ensuring a reliable finish. Fixing work can be done in good condition. Furthermore, since a hydraulic drive mechanism is built into the casing body, it is easy to carry and can be used anywhere. In particular, by using the core rod press-in machine according to the present invention, it is possible to quickly and reliably fix relatively large anchor bolts and fix them on a ceiling surface or the like.

[Brief explanation of drawings]

Fig. 1 is a side sectional view of the anchor bolt core rod press-in machine according to the present invention, Fig. 2 is a sectional view taken along the line of Fig. 1, and Fig. 3 is a partially enlarged cross section showing the anchor bolt core rod being pushed in. It is a diagram. DESCRIPTION OF SYMBOLS 11... Electric motor, 13... Casing body, 14... Oil tank, 15, 15a... Pump mechanism, 38... Piston rod, 39... Support member, 40... Anchor bolt clamp mechanism, 41
...Abutment part, 42...Nut holding part, B...Anchor bolt, C...Core rod, T...Rip part.

Claims (1)

[Scope of Claims] 1. A casing body with a built-in hydraulic drive mechanism; an embedded side tip that protrudes from the front end surface of the casing body so as to be movable forward and backward, and has a threaded portion formed in the head and forms a plurality of lip portions. a press-fitting piston rod that comes into contact with the head of a core rod that protrudes outward from the head of the anchor bolt, which is provided with a slit; An anchor bolt clamp having a stepped contact part having a substantially semicircular cross section and having a surface that comes into contact with the side opposite to the piston rod, and a nut holding part that fixes and holds the nut in a state in which the nut is in contact with the contact part. Anchor bolt core rod press-fitting, comprising: a mechanism; and a support member that fixes and holds the anchor bolt clamp mechanism at a front position separated by a predetermined distance from the front end surface of a casing body and has a space in which the core rod can be accommodated. Machine. 2. The nut holding section of the anchor bolt clamp mechanism includes a ball that comes into contact with the outer periphery of the nut and a spring that elastically presses the ball against the outer periphery of the nut. Core rod press-in machine as described in section. 3. Claim 1, characterized in that the nut holding part of the anchor bolt clamp mechanism is provided with a leaf spring that elastically abuts on the outer circumference of the nut.
Core rod press-in machine as described in section. 4. The core rod press-fitting machine according to claim 1, wherein the nut holding portion of the anchor bolt clamp mechanism includes a screw member whose tip abuts against the outer circumference of the nut. 5. The core rod press-fitting machine according to claim 1, wherein the support member has a substantially semicircular cross section.