JP6333774B2 - Construction method for top plate joints using threaded studs and mechanical joints - Google Patents

Description

  The present invention relates to a top plate joining work using a reinforcing steel stud method among the outer wall steel pipe sheet pile foundation works in the bridge lower part construction.

  Conventionally, when building a foundation of a frame such as a bridge, for example, as shown in FIGS. 2 to 4, a plurality of outer wall steel pipe sheet piles 2 are combined in a closed shape at a place where the foundation of the frame 1 is built, and driven into the ground. The closed shape is closed so that the inside of the closed shape becomes a closed space, the sand 3 and the bottom slab concrete are placed in the closed shape from the lower layer, the bottom slab 4 is placed, and then the top slab concrete is placed. The top plate 5 is constructed in order, and the inside wall steel pipe sheet pile 2 is filled with filled concrete 6.

  By the way, although the top plate 5 supports the housing 1, when the outer wall steel pipe sheet pile 2 also serves as a temporary deadline, the top plate 5 is coupled to the side surface of the outer wall steel pipe sheet pile 2.

  Conventionally, as a connecting structure between the outer wall steel pipe sheet pile 2 and the top plate 5, mainly a plate bracket method, a reinforcing bar method (for example, see Patent Document 1), and a reinforcing bar stud method (for example, see Non-Patent Document 1). Three schemes are used.

  Among these, in the reinforcing steel stud method, for example, as shown in FIG. 5, the top plate 5 has a reinforced concrete structure, so that one end of the moment reinforcing bar 7 and the shearing reinforcing bar 8 are directly stud-welded to the side surface of the outer wall steel pipe sheet pile 2. The steel plate sheet pile 2 is fixed, the other end is extended to the top plate 5 side, the top plate concrete is cast, and the top plate 5 and the outer wall steel pipe sheet pile 2 are integrated by the moment reinforcing bar 7, the shear reinforcing bar 8 and the top plate concrete. To make it possible to combine the two.

  The moment rebar 7 resists the moment and tensile force acting on the joint between the top plate 5 and the outer wall steel pipe sheet pile 2, and the shear rebar 8 acts on the top plate due to shear resistance against the vertical force on the joint. It is transmitted to the 5th bar. In this way, load transmission to the top slab 5 of the reinforced concrete structure is surely performed via the moment reinforcing bar 7 and the shearing reinforcing bar 8 of the connecting portion.

  By the way, in the joint structure of the conventional outer wall steel pipe sheet pile 2 and the top plate 5, welding work at the construction site is indispensable. Therefore, the construction is easily influenced by the situation of the construction site such as the weather and the power supply situation. It was a factor affecting quality.

JP 2001-214457 A

Nippon Steel Technical Report No. 382 “Reinforcing Bar High Quality Welding Method“ NS Stud Method ”” p. 96-98

  In view of the problems related to the conventional outer wall steel pipe sheet pile and top plate connection structure, the present invention is not subject to restrictions such as weather and power supply conditions, can shorten the work period, and further, the construction quality is reliable. It aims at providing the construction method regarding a top plate joint work with high property.

In order to achieve the above object, the construction method related to the top plate joint using the threaded stud and the mechanical joint according to the present invention is the outer wall steel pipe of the well foundation constructed by combining the outer wall steel sheet piles in a closed shape and driving them into the ground. It relates to a top plate joint that connects the top plate to the outer wall steel pipe sheet pile by extending the other end of the reinforcing bar with one end fixed to the side surface of the sheet pile to the top plate side and placing the top plate concrete. In the construction method, a well foundation is constructed using an outer wall steel pipe sheet pile with a threaded stud welded to the side in advance , one end of the rebar is connected to the threaded stud via a female thread member, and the threaded stud and the middle position are bent. The connecting portion with the female screw member is fixed by a lock nut so that the rebar does not rotate relatively, and the other end of the rebar is extended to the top plate side.

  In this case, after attaching the protective cap to the threaded stud welded to the side of the outer wall steel pipe sheet pile and constructing the well foundation, remove the protective cap from the threaded stud and connect the reinforcing bar to the threaded stud via the female thread member. Can be connected.

  According to the construction method relating to the top plate joint using the threaded stud and the mechanical joint of the present invention, the welding of the threaded stud to the outer wall steel pipe sheet pile can be performed in a place where the work environment is good, such as a factory. Because it is possible to carry out using machine equipment, construction is not subject to restrictions such as weather and power supply conditions, the construction period can be shortened, and it is not affected by the skill of the operator The reliability of construction quality can be improved.

  In addition, the protective cap attached to the threaded stud may damage the male threaded part of the threaded stud during the transfer from the factory to the construction site and before it is driven into the ground to construct the well foundation. Can be prevented.

It is explanatory drawing which shows one Example of the outer wall steel pipe sheet pile which applied the construction method regarding the top plate joint work using the threaded stud and mechanical joint of this invention. It is a front view which shows an example of the conventional well-cylinder foundation. It is the same top view. It is the same side view. It is explanatory drawing which shows the connection structure of the same outer wall steel pipe sheet pile and a top plate.

  Hereinafter, an embodiment of a construction method relating to a top plate joint using a threaded stud and a mechanical joint according to the present invention will be described with reference to the drawings.

  FIG. 1 shows an embodiment of an outer wall steel pipe sheet pile to which a construction method related to a top plate joint using a threaded stud and a mechanical joint according to the present invention is applied.

  The construction method related to the top plate joint using this threaded stud and mechanical joint is constructed by combining the outer wall steel pipe sheet piles 2 in a closed shape and driving them into the ground in the same manner as the conventional well foundation shown in FIGS. A well that joins the top plate to the outer wall steel pipe sheet pile 2 by extending the other end of the reinforcing bar with one end fixed to the side surface of the outer wall steel pipe sheet pile of the finished well foundation to the top plate side and placing top plate concrete A foundation structure is constructed by connecting the outer wall steel pipe sheet pile 2 of the foundation and the top plate, and the well foundation is constructed by using the outer wall steel pipe sheet pile 2 in which the threaded stud 71 is previously welded to the side surface. The reinforcing bar 70 is connected to the moment reinforcing bar 7 to constitute the moment reinforcing bar 7, the other end side of the reinforcing bar 70 is extended to the top plate side, and the top plate concrete is placed, so that the top plate is attached to the outer wall steel pipe sheet pile 2. Like to join It is intended.

  In this case, welding of the threaded stud 71 to the outer wall steel pipe sheet pile 2 is performed in a place where the work environment such as a factory is good as shown in FIG. , So that the welding can be performed in a stable state, downward welding.

  As the threaded stud 71, for example, a general-purpose threaded stud of M20 to M30, preferably M22 to M24 can be used.

Since the threaded stud 71 defines the extending direction of the other end of the reinforcing bar 70 constituting the moment reinforcing bar 7, the center of the threaded stud 71 is matched with the designed extending direction of the moment reinforcing bar 7. The direction of the axis is made to coincide with the radial direction with respect to the center of the outer wall steel pipe sheet pile 2, the direction of the central axis of the plurality of threaded studs 71 is parallel, or the central axis of the plurality of threaded studs 71 It is possible to weld the outer wall steel pipe sheet pile 2 in a random direction.
Note that the extending direction of the moment reinforcing bar 7 can be adjusted by bending the reinforcing bar 70 (or using the bent reinforcing bar 70).
The welding density of the threaded stud 71 is set in accordance with the required number of moment reinforcing bars 7, that is, the design strength of the joint portion between the top plate and the outer wall steel pipe sheet pile 2.

And after attaching the protective cap 9 to the threaded stud 71 welded to the outer wall steel pipe sheet pile 2 and constructing the well foundation, the protective cap 9 is removed from the threaded stud 71 as shown in FIG. Thus, the reinforcing bar 70 is connected to the threaded stud 71 via the female screw member 72.
Thereby, the external thread steel pipe sheet pile 2 in which the threaded stud 71 is welded to the side surface in advance is transferred from the factory to the construction site, for example, and then the male thread portion of the threaded stud 71 until it is driven into the ground to construct the well foundation Can be prevented from being damaged.

A female screw member 72 that connects the threaded stud 71 and the reinforcing bar 70 is fixed to one end of the threaded stud 71 and a female threaded part that can be screwed with the male threaded part of the threaded stud 71. It is possible to use a female screw member in which a female screw part that can be screwed with the male screw part is formed.
Then, after the threaded stud 71 and the female screw member 72 are screwed together, and further, the female screw member 72 and the reinforcing bar 70 are screwed together, and then fixed by the lock nut 73 respectively.
In this case, the internal thread portion formed on the internal thread member 72 has a normal right-hand thread structure, and has a structure divided into a right-hand thread and a left-hand thread at the center, and is fixed to the threaded stud 71 and the reinforcing bar 70. The male screw portion may be provided with a male screw corresponding thereto. Accordingly, by rotating only the female screw member 72 without rotating the reinforcing bar 70, the reinforcing bar 70 can be connected to the threaded stud 71 so as to draw the reinforcing bar 70, for example, a bent reinforcing bar. Installation can be performed easily.
In addition, it replaces with the reinforcing bar 70 which fixed the said external thread part to the reinforcing bar 70, a screw node reinforcing bar can be used, and the internal thread member corresponding to it can also be used for the internal thread member 72.

  By the way, in the construction method related to the top plate joint using the threaded stud and the mechanical joint, not only the moment reinforcing bar 7 but also the sheared reinforcing bar 8 is similarly configured by the threaded stud, the female thread member, and the reinforcing bar 70. be able to.

  According to the construction method related to the top plate joint using the threaded stud and the mechanical joint, the well foundation is constructed using the outer wall steel pipe sheet pile 2 in which the threaded stud 71 is welded to the side surface in advance. In order to connect the reinforcing bar 70 via the female screw member 72, extend the other end of the reinforcing bar 70 to the top plate side, and place the top plate concrete, welding of the threaded stud 71 to the outer wall steel pipe sheet pile 2 is performed. It is possible to perform the operation using mechanical equipment in a place with a good working environment such as a factory, if necessary. In addition, the construction is not easily affected by the conditions of the construction site such as the weather and the power supply situation, the construction period can be shortened, the automation of the welding operation is easy, and the reliability of the construction quality can be easily secured.

  As mentioned above, although the construction method regarding the top plate joining work using the threaded stud and the mechanical joint of the present invention has been described based on the embodiment, the present invention is not limited to the configuration described in the above embodiment. However, the configuration can be changed as appropriate without departing from the spirit of the invention.

  The construction method related to the top plate joining work using the threaded stud and the mechanical joint of the present invention can be shortened in the construction period without being restricted by the weather or the power supply situation, and the reliability of construction quality. Since it has a high characteristic, it can be used suitably for the use of the construction of the top plate coupling of the well foundation.

DESCRIPTION OF SYMBOLS 1 Frame 2 Outer wall steel pipe sheet pile 3 Laying sand 4 Bottom plate 5 Top plate 6 Filled concrete 7 Moment reinforcement 70 Reinforcement 71 Threaded stud 72 Female thread member 8 Shear reinforcement 9 Protection cap

Claims (2)

The other end of the reinforcing bar with one end fixed to the side of the outer wall steel pipe sheet pile of the well pipe foundation constructed by combining the outer wall steel pipe sheet piles in a closed shape and laid into the ground, and cast the top plate concrete In the construction method related to the top plate joining work, where the top plate is joined to the outer wall steel pipe sheet pile, a well foundation is constructed using the outer wall steel pipe sheet pile with the threaded stud welded to the side surface in advance. Connect one end of the reinforcing bar through the female threaded member, and fix the connecting part of the female threaded member with a lock nut so that the threaded stud and the reinforcing bar bent at the middle position do not rotate relative to each other. A construction method related to a top plate joint using a threaded stud and a mechanical joint characterized in that the end side is extended to the top plate side.   After attaching the protective cap to the threaded stud welded to the side of the outer wall steel pipe sheet pile and constructing the well foundation, remove the protective cap from the threaded stud and connect the rebar to the threaded stud via the female thread member A construction method relating to a top plate joining work using the threaded stud and the mechanical joint according to claim 1.

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