JP2824496B2 - Method of arranging reinforcing bars and jig for mechanical joint used therefor - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a method of arranging reinforcing bars, and in particular, to a pile head provided in a boiler foundation work or the like and a mesh-like structure temporarily assembled. The present invention relates to a method of arranging a reinforcing bar in which a mesh-shaped reinforcing bar is mounted on an upper portion of a steel pipe pile and then a pile head reinforcing bar is mounted on the steel pipe pile, and a jig for a mechanical joint used in the method.

"Conventional technology and its problems" Conventional methods of arranging this type of rebar are shown in Figs.
As shown in Fig. 17, there is known one used for boiler foundation work and the like.

In the figure, reference symbol G denotes the ground on which the foundation is installed.
Inside, a steel pipe pile 1 is cast at regular intervals such that its head slightly protrudes above the ground. A plurality of pile heads are welded along the outer periphery of the pile head of the steel pipe pile 1 to be erected, and a temporarily assembled mesh-shaped reinforcing bar 3 is provided on the upper part thereof. Lower mat A,
The base is constructed by dividing the middle mat B and the upper mat C into blocks and assembling them.

However, in the conventional method of arranging the reinforcing bars, the pile head is welded and fixed to the head of the steel pipe pile for ease of operation, and then the mesh of the lower mat A temporarily assembled in advance from the upper portion thereof. Since the reinforcing bar is provided, the pile head 2 and the mesh-shaped reinforcing bar 3 interfere with each other, thereby lowering the work efficiency and avoiding interference with the pile head. For this reason, there is a problem that the accuracy of the arrangement position of the mesh-shaped reinforcing bar 3 is reduced.

The present invention has been made in order to solve the above problems, without interfering between the pile head and the mesh-shaped rebar, a method of arranging the rebar capable of efficiently performing the foundation mat construction and The purpose is to provide a jig for the mechanical joint.

"Means for Solving the Problems" The method of the present invention comprises placing a steel pipe pile so that its head protrudes into the ground, and then placing a reinforcing jig on the top end of the steel pipe pile. After marking the arrangement position of the mesh-shaped rebar constituting the lower mat on the steel pipe pile, and then fixing the mechanical joint to the outer periphery of the steel pipe pile using the jig so as not to overlap the marked part, the steel pipe A mesh-shaped reinforcing bar is arranged at the position of the mark on the top of the pile, and a pile head is inserted from between the mesh-shaped reinforcing bars, and the tip is attached to the mechanical joint.

Further, the jig used in the method of the present invention has a supporting portion mounted on the top end of the steel pipe pile, and a jig suspended from the supporting portion and holding the mechanical joint along the outer peripheral portion of the pile head. An annular holding part for fixing the mechanical joint fixed to the bottom side of the holding part and dropped from the top of the pile head between the pile head and the holding part to a predetermined height of the pile head It has a receiving portion for holding.

[Operation] In the method of the present invention, the position where the mesh-shaped rebar is provided is marked on the top end of the pile head using a reinforcing jig, and then the mark is formed along the circumferential direction of the pile head. Since the mechanical joint is fixed so that it does not overlap, even after the mesh rebar is placed on the top of the pile head, the pile head rebar does not interfere with the mesh rebar from the top. It is fixed to a pile head and attached to a mechanical joint.

In the jig of the present invention, when the holding portion is located on the outer periphery of the pile head and dropped along the pile head, the support portion fixed to the upper portion of the holding portion is locked to the top end of the pile. As a result, the jig is easily mounted on the pile head. Also, by simply dropping the mechanical joint from the top of the pile between the pile head and the holding part, the mechanical joint is held on the outer periphery of the pile head, and the bottom of the mechanical joint is supported by the receiving part and the It will be supported at a predetermined height.

Hereinafter, the present invention will be described with reference to the drawings.

1 to 14 show a first embodiment of the method of arranging reinforcing bars according to the present invention. In these figures, the same reference numerals are given to the same components as the components shown in the above-mentioned conventional technology.

FIG. 1 shows a pile head rebar and a reinforcing mesh assembled on a pile head using the jig for a mechanical joint of the present invention, wherein the steel pipe pile is buried in the ground G and slightly protrudes from the ground. A plurality of couplers (mechanical joints) 11 are welded and fixed to the head 1 along the circumferential direction, and the tip of the pile head 2 is screwed to the coupler 11 to be erected. Between the head muscles 2, a mesh-shaped reinforcing steel bar 3 constituting a lower mat is disposed.

As shown in FIGS. 2 and 3, the coupler 11 has a main body 11a formed in a cylindrical shape and a screw 11b formed inside the main body 11a. The injection hole c is formed. The coupler 11 is fixed to the outer periphery of the steel pipe pile 1 by welding along the longitudinal direction, and the tip of the pile head 2 is screwed inside the coupler 11. Further, the coupler 11 is formed of a material having a fixed length dimension capable of allowing a force acting from the pile head 2 and having a predetermined strength and good weldability with a steel pipe pile.

In this embodiment, both ends of the coupler 11 are provided so as to be separated by about 10 cm from the top end of the pile and the lower end of the foundation.

Next, a jig for a mechanical joint used in the method of the present invention will be described with reference to FIGS.

The jig T for mechanical coupling (hereinafter, simply referred to as “jig”) T of the present embodiment is a support mounted on the top end of a steel pipe pile 1 provided with a slightly protruding head in the ground G. A part 12, and a holding part 13 which is suspended from the support part 12 and is formed in an annular shape for holding a coupler (mechanical joint) 11 between the pile head along the outer periphery of the pile head, To receive the coupler 11 fixed to the bottom side of the holding part 13 and inserted between the pile head and the holding part from the top of the pile head, to hold the coupler 11 at a predetermined height of the pile head And a receiving portion 14 of the main body.

The four support portions 12 are provided at equal intervals along the circumferential direction of the steel pipe pile 1 and extend in the radial direction so that the tips are locked to the top end of the steel pipe pile. And four rectangular plate members 12a.

The holding portion 13 is composed of an upper ring plate 15a and a lower ring plate 15b which are formed in an annular shape on the outer peripheral portion of the steel pipe pile by being separated by the diameter of the coupler 11, and the upper ring plate 1
5a and the lower ring plate 15b are connected by connecting plates 15c extending in the longitudinal direction of the steel pipe pile and provided at predetermined intervals along the circumferential direction of the steel pipe pile. Then, the holding unit 13
The inner peripheral surface of the upper ring plate 15a is suspended from the plate 12a by being fixed to the outer end of the plate 12a.

The receiving portion 14 bends the round steel 14a into an L shape, and extends the round steel 14a so that one side extends toward the center O of the steel pipe pile 1 and the tip is close to the outer peripheral surface of the steel pipe pile. One side is fixed inside the lower ring. The round bars 14a are provided at predetermined intervals along the circumferential direction of the steel pipe pile according to the number of couplers (that is, pile heads) fixed to the outer peripheral surface of the steel pipe pile. The position of the round bar 14a is set to such a height that the coupler dropped into the holding portion is held at a predetermined position.

In this embodiment, the round steel 14a has a central angle θ = 6.
By being fixed to the inner side of the lower ring plate 15b every ゜, twelve pile heads along the circumferential direction (in this case, every central angle θ = 30）) or twelve along the circumferential direction ( in this case,
It is made possible to arrange a pile head with a central angle = every 18 °).

Further, the upper ring plate 15a and the lower ring plate 15b,
The notch K is provided at one position, so that the diameter can be freely increased. With this, the jig T can be easily mounted on the head of the steel pipe pile 1, and the steel pipe pile can be mounted from above the steel pipe pile 1. The coupler 11 can be easily dropped between the upper ring plate 15a and the lower ring plate 15b. On both sides of each cutout K of the upper ring plate 15a and the lower ring plate 15b, locking members 15d for connecting the cutouts K are provided, and between the steel pipe pile 1 and the holding portion 13. After the coupler 11 is dropped, the upper ring plate 15a and the lower ring plate 15b are respectively reduced in diameter by the locking member 15d, so that the coupler 11 is urged to the outer peripheral surface of the steel pipe pile 1. .

The upper ring plate 15a and the lower ring plate 15b have
A screw plate may be provided on the opposite side of the cutout portion so that these can be folded outward in two.

Next, a method of arranging the reinforcing bars according to the present embodiment will be described with reference to FIGS.

(I) After placing the steel pipe piles 1 at predetermined intervals in the ground so that the head slightly protrudes from the ground, as shown in FIG. The jig 16 for the back muscle is placed at a position where the jig 16 does not overlap with the pile head muscle, and the arrangement position of the mesh-shaped rebar constituting the lower mat is marked with paint or the like. The uniform distribution design is such that the pitch and rebar diameter of the mesh-shaped rebar are predicted in advance, and the position of the pile head rebar is designed so that they are arranged so as to have a specified strength. .

(Ii) Next, as shown in FIG. 7, a jig T is attached to the outer peripheral portion of the head of the steel pipe pile 1, and the steel pipe pile 1 and the holding portion 13 of the jig T are mounted from above the steel pipe pile 1. The coupler 11 is dropped every central angle θ = 30 ° (or θ = 18 °) along the circumferential direction. The lower end of the coupler 11 dropped into the holding portion 13 contacts the receiving portion 14 and is automatically held at a predetermined height position of the steel pipe pile 1. When the coupler 11 dropped into the jig T overlaps the mark marked on the top end of the steel pipe pile 1 on a plane, the coupler 11 is moved in the circumferential direction, and then the holding portion is tightened. This urges the coupler 11 to the outer peripheral portion of the steel pipe pile.

(Iii) After temporarily attaching the coupler 11 around the steel pipe pile in the above state, the jig T is removed from the pile head.

(Iv) After curing so that dust such as spatter does not enter the inside of the coupler 11 temporarily attached to the pile head, as shown in FIGS. 8 (a) and 8 (b), put the coupler 11 on the pile head. Fully weld and fix.

(V) Next, as shown in FIG. 9, the lower end surface of the lower mat A is formed by casting concrete C on the ground surface.

(Vi) Next, as shown in FIGS. 10 (a) and (b),
At the position of the mark on the top end of the steel pipe pile, the reinforcing mesh 3a at the lower end mesh
Place.

(Vii) Next, as shown in FIG. 11, the upper mesh reinforcing bar 3b is arranged in accordance with the lower mesh reinforcing bar 3a.

(Viii) Next, as shown in FIGS. 12 (a) and 12 (b), the upper end mesh-shaped reinforcing bar 3b and the lower end meshed reinforcing bar
A pile head 2 having a screw formed between 3a is inserted and its tip is screwed to the coupler 11, and then a grout material (resin) is injected into the inside of the coupler 11. This can prevent the pile head muscle from moving within the coupler.

In addition, instead of injecting the grout material, a torque method, that is, a torque is applied to two nuts arranged at both ends of the coupler, an axial force is introduced into the joint portion, and the joint portion is forcibly brought into close contact with the meshing portion to reduce play. May be used.

(Ix) Next, as shown in FIG. 13, the upper mesh reinforcing bar 3b is pulled up to a predetermined position by a crane or the like.

As described above, according to the method of arranging the reinforcing bar of the present embodiment, the reinforcing bar jig 16 is placed on the top end of the steel pipe pile 1 to mark the position where the mesh-shaped reinforcing bar is to be laid, and then to mark. After attaching a mechanical joint to the outer peripheral portion of the steel pipe pile 1 using a jig T so as not to overlap with the portion, the upper and lower mesh reinforcing bars 3a and 3b are arranged at the positions of the upper marks of the steel pipe pile 1. Since the pile head 2 is inserted from between the mesh reinforcing bars and its tip is attached to the mechanical joint 11, the pile head 2 and the mesh reinforcing bar 3 may interfere with each other. In addition, the work efficiency can be improved, and the arrangement of the reinforcing bars 3a and 3b in the mesh shape can be determined in advance, so that the accuracy of the arrangement of the reinforcing bars can be improved.

In the first embodiment, the reinforcing bar 3a having a mesh shape at the lower end is used.
After arranging and overlapping the upper mesh reinforcing bar 3b, the pile head 2 was inserted between them and screwed to the coupler 11, and then the upper mesh reinforcing bar 3b was lifted to a predetermined position. As a modified example, a lower end mesh-shaped reinforcing bar 3a is arranged at a pile head, and a pile head 2 is inserted between the reinforcing bars 3a and screwed to a coupler of the pile head. You may make it arrange | position a reinforcing bar of a mesh upper end.

Next, a second embodiment of the method of the present invention will be described with reference to FIGS. 14 to 15 (a) and (b). In this embodiment, the same components as those shown in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

The pile head used in this method is shown in Fig. 15 (a),
As shown in (b), the pile head is shorter than that used in the first embodiment, and the fixing plate 17 is attached to the upper end thereof, thereby improving the adhesive force of concrete. .

Then, as shown in FIG. 14, after placing the lower end mesh-shaped reinforcing bar 3a on the head of the steel pipe pile 1, the pile head 2 is inserted from between the lower end meshed reinforcing bars 3a and fixed to the pile head. After the tip is screwed to the coupler 11, a reinforcing bar 3 b having a mesh shape at the upper end is disposed above the coupler 11.

Therefore, in the method of arranging the rebar according to the present embodiment,
In addition to having the same operation and effect as the above-described embodiment, the pile head 2 and the upper mesh reinforcing bar 3b do not overlap in the height direction, and the introduction of the upper mesh reinforcing bar 3b is facilitated. Workability and safety can be improved, such as easy curing of the ends of the streaks 2 and easy assembly of the middle mat B on the upper part of the lower mat A.

In the jig for the mechanical joint shown in the above embodiment,
The support portion 12, the holding portion 13, and the receiving portion 14 are not limited to those described above, and can be appropriately designed and changed according to conditions, and the support portion 12 is mounted on the top end of the steel pipe pile 1. The holding portion 12 may be any one that is positioned annularly around the steel pipe pile 1 to hold the mechanical joint 11 between the steel pipe pile and the steel pipe pile 1. Okay, receiving part
14 is a mechanical joint dropped between the steel pipe pile 1 and the holding part 12
One that receives the bottom of 11 and holds the mechanical joint 11 at a predetermined height of the steel pipe pile 1, for example, a bottom plate fixed to the lower end of the holding part 12 and fixed in an annular shape may be provided. .

[Effects of the Invention] As described above, the method of arranging reinforcing bars according to the present invention is based on the method of arranging the reinforcing bar jig on the top end of the steel pipe pile provided in the ground, , And after attaching a mechanical joint to the head of the steel pipe pile using a jig, a mesh-shaped reinforcing bar is arranged at the position of the mark, and a pile head is inserted from between the mesh-shaped reinforcing bars. Since the reinforcement is inserted and attached to the mechanical joint, the mesh-shaped reinforcement arranged earlier and the pile head connected later to the steel pipe pile do not interfere with each other, and construction can be performed efficiently. It can be carried out.

Further, a jig used in the method of the present invention includes a support portion mounted on the top end of the steel pipe pile, and a holding portion formed in an annular shape for hanging a mechanical joint suspended from the support portion. And a receiving part fixed to the bottom side of the holding part for holding the mechanical joint at a predetermined height of the pile head, so that the jig is supported on the upper part of the steel pipe pile. The mechanical joint can be easily mounted on the pile head simply by locking the part, and the mechanical joint can be easily arranged at a predetermined location of the pile head simply by dropping the mechanical joint between the steel pipe pile and the holding part. As a result, there is an effect that the working efficiency can be greatly improved.

[Brief description of the drawings]

FIGS. 1 to 13 show a first embodiment of the present invention. FIG. 1 is a side view of a mesh-shaped reinforcing bar and a pile head bar constructed on a capital by the method of the present invention. FIG. 3 is a plan view of the coupler, FIG. 3 is a side view of the coupler, FIG. 4 is a sectional side view of the jig, FIG. 5 is a plan view of the jig, FIG.
FIG. 13 is a diagram for explaining a method of arranging reinforcing bars.
FIG. 7 is a perspective view of a pile head on which a jig for arrangement is arranged, FIG. 7 is a perspective view of a pile head on which a jig is arranged, and FIG. 8 (a) is a view of a pile head to which a coupler is fixed. FIG. 8 (b) is a perspective view of FIG. 8 (a), FIG. 9 is a side view of a pile head in a state where a dumping cone is hit,
FIG. 10 (a) is a side view of a pile head with a lower end mesh-shaped reinforcing bar disposed at an upper portion, FIG. 10 (b) is a perspective view of (a), and FIG. 11 is an upper end meshed reinforcing bar 12 (a) is a side view of the pile head with the pile head muscle attached, FIG. 12 (b) is a perspective view of (a),
FIG. 13 is a side view of a pile head in a state where a reinforcing bar having a mesh upper end is lifted, FIGS. 14 to 15 show a second embodiment of the present invention, and FIG. Side view of the constructed mesh rebar and pile head, Fig. 15 (a)
Is a plan view of the fixing plate, (b) is an enlarged side view of a pile head, and FIGS. 16 and 17 show a conventional technique.
Fig. 16 is a side view of a foundation in which a pile head is fixed to the upper part of the pile head, and a lower mat, a middle mat, and an upper mat are provided with mesh reinforcing bars. Fig. 17 is a portion of Fig. 16 It is the side view of the pile head which expanded. G: ground, T: jig for mechanical joint, A: lower mat,
DESCRIPTION OF SYMBOLS 1 ... Steel pipe pile, 2 ... Pile head reinforcement, 3 ... Mesh-shaped reinforcement, 11 ... Mechanical coupling, 12 ... Support part, 13 ... Holding part, 14
...... Receptacle, 16 ... Jig for reinforcement arrangement.

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Masafumi Adachi 2-16-1, Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Toshiaki Itabashi 2-16-1, Kyobashi, Chuo-ku, Tokyo Shimizu Construction (72) Inventor Mitsuhiro Egawa 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Corporation (72) Inventor Katsuaki Abe 3 Higashi-Ogishima, Kawasaki-ku, Kawasaki, Kanagawa Prefecture Tokyo Electric Power Co., Inc. (72) Inventor Shigeru Hayashi 3 Higashi-Ogishima Thermal Power Plant, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Tokyo Electric Power Co., Inc. In-house (58) Field surveyed (Int. Cl. ⁶ , DB name) E02D 5/34 E02D 27/12

Claims (2)

(57) [Claims] After a steel pipe pile is driven into the ground so that its head protrudes, a jig for reinforcing bars is placed on the top end of the steel pipe pile according to an equal distribution design, and a lower mat is placed on the steel pipe pile. After marking the arrangement position of the mesh-shaped reinforcing bars to be configured, and then fixing the mechanical joint to the outer peripheral portion of the steel pipe pile using a jig so as not to overlap the marked portion, the mark on the upper part of the steel pipe pile is marked. A mesh-shaped reinforcing bar is disposed at a position between the mesh-shaped reinforcing bars, and a pile head is inserted between the mesh-shaped reinforcing bars, and a tip thereof is attached to the mechanical joint. 2. A jig used in the method for arranging reinforcing bars according to claim 1, wherein the supporting portion is mounted on a top end of a steel pipe pile.
An annular holding portion suspended from the support portion and holding a mechanical joint along an outer peripheral portion of the pile head,
A receiving portion for holding a mechanical joint fixed to the bottom side of the holding portion and dropped between the pile head and the holding portion from above the pile head at a predetermined height of the pile head. A jig for a mechanical joint.