JPH0738559Y2 - Driving pin - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is a driving pin used as a standard for the spraying thickness of sprayed concrete during concrete spraying work such as lining of tunnel work and slope protection work. Regarding

[Prior Art] For example, in tunnel construction, a primary lining for spraying concrete on the rock mass of an excavated tunnel and a secondary lining for spraying concrete onto the sprayed concrete, respectively. Welding wire mesh is intervened in the weak part of the bedrock between the concrete sprayed by the primary lining and the secondary lining, respectively, to reinforce it, and a water blocking sheet is placed over the entire surface. We are trying to prevent cracking of concrete.

Further, in the secondary lining, first, in the concrete sprayed in the primary lining, a plurality of sites over the entire surface, drill holes, there, by hammering the driving pin using a hammer or the like, The tip end of the driving pin is driven while leaving the base end of the driving pin for a predetermined length, and then the secondary lining is sprayed on the surface of the blasting concrete of the primary lining that forms the base. This is performed until the base end portion of the pin projecting is buried with reference to the base end portion protruding from the pin, whereby the spraying thickness of the sprayed concrete of the secondary lining is set to be uniform.

In addition, in general concrete spraying work other than tunnel construction, the driving pin is directly driven onto the foundation such as bedrock, and the concrete is sprayed onto the foundation based on the projecting driving pin. ing.

Here, as the driving pin, an L-shaped anchor-shaped one or a nail-shaped one with a straight head is used. In this driving work, in many cases, the operator makes a visual observation. It is the current situation that the driving depth is decided by and the driving is done manually, but recently, a pin driving machine for driving the driving pin by power drive has been developed.

[Problems to be solved by the invention] By the way, in the above-mentioned conventional manual driving of the driving pin, the driving depth is determined by visual inspection.
Since the number of driving pins to be driven is large, the driving work requires skill and time, and also the driving depth of the driving pin at the tip end, that is, the protruding length of the driving pin at the base end. However, there was a problem that high accuracy could not be obtained, the standard of spray thickness became ambiguous, and the spray thickness of sprayed concrete became uneven.

On the other hand, when driving a driving pin with a pin driving machine, the driving pin cannot be driven straight from the inside of the gun cavity due to the presence of the head of the driving pin. There is a problem that it is necessary to provide a guide leg having the same diameter as the head of the driving pin at the tip portion and guide the head and the guide leg along the wall of the gun cavity.

Further, since the outer peripheral surface of the driving pin is smooth, there is a problem that it does not bite well against the shot concrete.

The present invention has been made in view of the above conventional problems, and an object thereof is to easily and swiftly drive a driving pin when driving a driving pin into a foundation such as a bedrock and to improve workability. In addition to improving the accuracy of the driving depth of the tip of the driving pin, that is, the protruding length of the base end of the driving pin, the reference of the spraying thickness of the shotcrete is made accurate, and the spraying thickness It is an object of the present invention to provide a driving pin which enables the driving pin to be driven straight from the inside of the gun cavity, particularly when a pin driving machine that is driven by power is used.

Another object of the present invention is to provide a driving pin which can have a good bite against shot concrete.

[Means for Solving the Problems] In the present invention, in order to solve the above-mentioned conventional problems,
In a driving pin used as a reference for the thickness of the concrete sprayed onto the base by projecting the base end from the base by driving the base end into the base such as rock. On the base end of the driving pin, a tubular body for setting the reference length of the spraying thickness of shotcrete is press-fitted and fixed, and the outer diameter of the tubular body is adjusted to The present invention proposes a driving pin characterized in that it corresponds to the inner diameter of the gun cavity wall of the provided pin driving machine, and is configured to serve as a guide portion when the cylindrical body is driven into the driving pin.

Further, in the above configuration, a configuration is proposed in which a concavo-convex portion is provided on the outer peripheral surface of the tubular body.

[Operation] According to the present invention, with the above configuration, the tubular body is press-fitted and fixed onto the base end portion of the driving pin, and the tubular body sets the reference length of the spraying thickness of the shotcrete. So
When driving a driving pin into a bedrock or the like, the driving work can be performed easily and quickly, which improves workability and also the driving depth of the driving pin tip, that is, the projection of the driving pin base end. The accuracy of the length is improved, the reference of the spray thickness of the sprayed concrete is made accurate, and the spray thickness is made uniform, and in particular, the outer diameter of the tubular body is set to the gun cavity for driving the driving pin. Since the tubular body corresponds to the inner diameter of the gun cavity wall of the pin driving machine and serves as a guide portion when the driving pin is driven, the tubular body can also be used as a guide, and a separate guide is provided. Without using the pin driving machine, the driving pin can be driven straight from the inside of the gun cavity, and good driving can be performed.

Further, since the uneven portion is provided on the outer peripheral surface of the cylindrical body,
Good biting to shotcrete can be achieved.

[Embodiment] First and second embodiments of a driving pin according to the present invention.
It will be described in detail with reference to the drawings.

In the figure, reference numeral 1 is a driving pin, which is composed of a pin body 2 and a tubular body 3.

The pin body 1 extends straight, the tip is sharply formed,
As shown in FIG. 2, it is designed so that it can be easily driven into the bedrock 4 that constitutes the base, and has a large-diameter head 5 at the base end that is struck by a hammer (not shown).

The tubular body 3 is press-fitted and fixed on the base end portion of the pin body 1, is connected to the head 5, and is arranged substantially along the axial direction of the pin body 2,
Occupies half the area.

As shown in FIG. 2, when the tip of the driving pin 1 is driven into the bedrock 4 by a pin driving machine as shown in a second embodiment described later, the lower end of the tubular body 3 in the figure is reached. The portion is in contact with the surface of the bedrock 4, and the protrusion length H of the base end portion protruding from the surface of the bedrock 4 is regulated according to the length of the tubular body 3. The protrusion length H is, for example, 50 mm
It is regulated to about 100 mm.

When the concrete 6 is sprayed onto the bedrock 4 so as to bury the projecting base end, the thickness of the sprayed concrete 6 becomes a thickness according to the projecting length H of the base end, and the projecting base end Using the parts as the reference for the spraying thickness of the concrete 6 sprayed on the bedrock 4, the lengths of the tubular bodies 3 are made different to obtain the projecting length H corresponding to them, thereby spraying The reference length of the spray thickness of the concrete 6 can be set.

With the above configuration, the tubular body 3 is press-fitted and fixed on the base end portion of the driving pin 1, and the tubular body 3 sets the reference length of the spraying thickness of the sprayed concrete 6, so that the bedrock 4
When the driving pin 1 is driven into the shaft, the driving work can be performed easily and quickly to improve workability, and the driving depth of the tip of the driving pin 1, that is, the protruding length of the base end of the driving pin 1. Accuracy is improved, the reference of the sprayed thickness of the sprayed concrete 6 is made accurate, and the sprayed thickness is made uniform.

The tubular body 3 made of resin is
The base end portion of the pin body 1 can be easily press-fitted, the corrosion resistance and the durability are good, and further, coloring is easy, and when the concrete 6 is sprayed, the driving pin 1 can be clearly seen, The concrete 6 can be sprayed so that the base end of the driving pin 1 is surely buried, and the standard of the spraying thickness of the spraying concrete 6 is made more accurate, and the spraying thickness of the spraying concrete 6 is further improved. Good spraying is possible, for example, it can be made uniform.

In the first embodiment described above, the schematic shape of the driving pin and the outline of the driving state are described, but in the second embodiment below, the relationship between the driving pin and the pin driving machine, which is the feature of the present invention, will be specifically described. .

In the driving pin 21 of the present embodiment, the outer diameter of the tubular body 22 is made to correspond to the inner diameter of the gun cavity wall 25 of a pin driving machine (not shown) that is provided with a gun cavity 23 for driving the driving pin 21. With this, when the driving pin 21 is driven, the tubular body 22 is slid along the gun cavity wall 25, and the tubular body 22 has a reference length of the spraying thickness of the sprayed concrete 4. Not only is it set, but it also works as a guide and is also used.

The pin driving machine is designed to drive the driving pin 21 from the inside of the gun cavity 23 via the driver 26 by driving power such as air pressure and gunpowder.

With the above configuration, the outer diameter of the tubular body 22 is made to correspond to the inner diameter of the gun cavity wall 25 of the pin driving machine having the gun cavity 23 for punching the driving pin 21, and the tubular body 22 is driven by the driving pin 21. Since it serves as a guide part when ejecting, the tubular body 22 can also be used as a guide, and it is possible to directly eject the driving pin 21 from the inside of the gun cavity 23 even if a pin driving machine is used without providing a separate guide. , Enables good driving.

In addition, regarding other configurations, operations and effects,
It is similar to the embodiment of.

Next, a third embodiment will be described with reference to FIG.

In the driving pin 31 of this embodiment, the tubular body 22 of the second embodiment is used.
The cylindrical body 33 is configured by providing, for example, the protrusions 32 that form the uneven portion on the outer peripheral surface except both ends of the cylindrical body 33. The tubular body 33 is integrally molded.

With the above configuration, since the projection 32 is provided on the outer peripheral surface of the tubular body 33, it is possible to improve the biting of the sprayed concrete 6.

In particular, when steel fiber reinforced concrete is used as the sprayed concrete 6, the fibers are the protrusions 32 of the tubular body 33.
In addition, it is sufficiently entangled and good spraying is possible.

Further, since the projections 32 are not provided at both ends of the tubular body 33 and the smooth portion 34 which is formed smoothly is provided, the tubular body 33 is further provided along the gun cavity wall 25 of the pin driving machine 24. , Can be slid smoothly.

Regarding other configurations, operations and effects,
It is similar to the embodiment of.

Although the present invention has been described above with reference to the respective embodiments, the present invention is not limited to the above-mentioned embodiments and various modifications can be made without departing from the scope of the invention.

In each of the above embodiments, the case where the bedrock 4 is used as the base has been described, but the present invention is not limited to the bedrock 4, and is applicable to the case where the base is sprayed concrete for the primary lining in tunnel construction. Further, it is applicable not only to tunnel construction but also to concrete spraying construction performed in slope protection construction and the like.

[Effects of the Invention] As described above, according to the driving pin according to the present invention, the cylindrical body is press-fitted and fixed onto the base end portion of the driving pin, and the sprayed concrete is sprayed by the cylindrical body. Since the reference length of the mounting thickness is set, when driving the driving pin into the foundation such as rock, the driving work can be done easily and quickly, and the workability is good and the tip of the driving pin is It has various effects such as increasing the precision of the driving depth of the driving pin, that is, the accuracy of the projecting length of the base end of the driving pin, making the reference of the spraying thickness of sprayed concrete accurate, and making the spraying thickness uniform. At the same time, particularly when the outer diameter of the tubular body is made to correspond to the inner diameter of the gun cavity wall of a pin driving machine having a gun cavity for punching the driving pin, Since it serves as a guide part, the tubular body can also be used as a guide. Apart without providing a guide, even using a pin driving tool, a driving pin as Uchidaseru straight from the gun cavity, to allow a good implant.

Further, since the uneven portion is provided on the outer peripheral surface of the cylindrical body,
It is possible to improve the bite to shot concrete.

[Brief description of drawings]

FIG. 1 is a front view showing a first embodiment of a driving pin according to the present invention, FIG. 2 is a longitudinal sectional view showing its use condition, and FIG. 3 is a main part showing the use condition of the second embodiment. FIG. 4 is a vertical cross-sectional view of a main part showing a usage state of the third embodiment. 1, 21, 31 …… Driving pin 3, 22, 33 …… Cylindrical body, 4 …… Bedrock 6 …… Shot concrete, 23 …… Gun cavity 25 …… Gun cavity wall, 32 …… Projection

Claims (2)

[Scope of utility model registration request] 1. A base such as a bedrock or the like is driven with its tip end to project a base end from the base, and the protruding base end is used as a standard for a spraying thickness of concrete sprayed on the base. In the driving pin, a tubular body for setting the reference length of the spraying thickness of the shotcrete is press-fitted and fixed on the base end portion of the driving pin, and the outer diameter of the tubular body is set to the driving pin. A driving pin, which corresponds to the inner diameter of the wall of the gun hole of a pin driving machine having a gun hole to be driven, and which serves as a guide portion when the tubular body is driven. 2. The driving pin according to claim 1, wherein an uneven portion is provided on the outer peripheral surface of the cylindrical body.