JPH0642295A - Joint hardware for connecting pc lining and shape of cutting die for forming void for clamping joint hardware - Google Patents

Abstract

PURPOSE:To make it possible to reinforce the strength of a connecting part to a greater extent and prevent the falling of cured mortar which had buried and finished this void. CONSTITUTION:A screw 7 at the tip of a buried bolt 3 is directly fastened and connected with a cylinder-shaped joint hardware 5 and a hexagon-shaped joint hardware 6 (A nut 4 is incorporated into this cylinder-shaped space and fastened.) A clamping space 9 is formed in the shape of an inverted chevron.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a strong joint metal fitting when connecting RC lining materials for tunnels (including secondary concrete products in general, which also receive a large external force), and a cavity for tightening the joint metal fitting. Concerning the shape of the punching die and the method of installing and removing it.

[0002]

2. Description of the Related Art A conventional joint fitting for connecting RC lining materials is

6 (a) and (b), (c), and (d) showing the cross-sections of the joint metal fittings are typical ones, and the joint metal fitting 19 is a tightening bolt which is brought into contact with each other at the joint surface 2. And nut 20 to connect. In addition, various construction methods have been proposed, such as a long spot bolt or a bent bolt method in which the steel plate tightened with this bolt is made far.

Incidentally, Japanese Patent Laid-Open Publication No. Sho 54-54
In 45938, the steel material is U-shaped without using the steel plate as described above, the required length of the straight portion is embedded in the lining material, and the semicircular portion is projected from the joint surface 2. When they are joined together, they are assembled with each other to form a circular shape, and pins are inserted into the circular shape for connection. For this connection, only this portion is provided with a semicircular die-shaped cavity inside each other from the joint surface 2 and the joint surface 2 is in contact with and tightened.

On the other hand, since the shape of the space for tightening the bolt and the nut of the ordinary joint is wide on the inner surface of the tunnel in any direction, it is finished by mortar filling after connection. In this case, this mortar may fall off after curing.

[0005]

In the conventional RC lining material, when a large bending moment is applied to the connecting portion by an external force, the bolts and nuts 20 which are tightened by connecting the joint metal fittings are sufficiently strong against the force. Although the steel plates of the joint metal which are tolerable but are in contact with each other at the joint surface are greatly deformed even when the external force is small, the opening of the joint surface 2 becomes an inverted V shape and yield fracture occurs. For this reason, various methods have been devised to reinforce the steel plate of the joint metal so as to increase its rigidity. However, the material cost of the joint metal significantly increases and there is a problem in construction. In addition to this, there are examples of long spot bolts and bent bolts, but there were problems in manufacturing or construction.

The above

In the Japanese Patent Laid-Open Publication No. 1993-331, a semicircular steel material for connection projects from the joint surface. As an example of construction in a shield machine

FIG. 5 shows. It is impossible to insert the K lining material in the direction of the black arrow in the figure due to this protrusion. In addition,
When assembling A and B1 or B2, there were problems such as damage to concrete and water-blocking rubber that contact each other.

On the other hand, in order to make the tunnel a permanent structure, especially in the case of a tunnel through which water flows, concrete for the secondary lining is placed on the inner surface side after the primary lining. This had problems such as an increase in the construction period and a corresponding increase in construction costs.

The object of the present invention is to ensure that the connecting portions of the RC lining material have sufficient bearing strength of the tightening bolts and nuts when a large bending moment is applied to them by an external force, and in the construction work. In order to easily assemble the RC lining material into the cylindrical shape of the tunnel inside the shield machine,
Fittings and fittings do not protrude from the joint surface.

Furthermore, after the completion of the primary lining with only the RC lining material, when the cavities for tightening the joint metal fittings are filled with mortar and finished as a tunnel, for the purpose of forming cavities that do not fall off after the mortar hardens. Need to be die-cut.

[0010]

In order to achieve the above object, in the shape of the coupling fitting of the present invention and the die for forming a void for tightening the fitting,

The connecting joint metal fitting is not the joint metal fitting in the conventional method but the connecting tightening bolt itself at the normal connecting joint position of the RC lining material, and the diameter and length required for the force acting at that point. As a result, the screw side tip is positioned near the joint surface, and the head side of the bolt is an embedded bolt set in concrete of RC lining material. At this time, the tip of the screw side should not come out of the joint surface, and the minimum length required for mounting the tightening hardware described below should be accurately exposed in the space for tightening the joint hardware.

When the joint is connected, only the tip of the embedded bolt on the screw side is opposed to the other in the joint metal fitting fastening space. Directly utilizing this screw, it is tightened and connected by the following two kinds of joint metal fittings having a strength considerably higher than the tensile force of the buried bolt.

A round steel rod is cut into a predetermined length to form a cylindrical shape, a female screw corresponding to the male screw of the embedded bolt is provided on the inner surface, and the outer surface on the joint surface side corresponds to the diameter. Then, make a male screw of the required length to make one of the cylindrical fittings, and fix it to the screw at the tip of the embedded bolt.

The metal object corresponding to this is that a hexagonal steel rod is cut into an appropriate length, and the bottom plate is left inside from one side of the cut surface so that two cylindrical inner spaces are U-shaped. To make. First, at the entrance, make a female screw corresponding to the male screw provided on the outer surface of the above-mentioned cylindrical fitting hardware, and on the inside, there was a margin so that the nut for the embedded bolt could easily rotate to the bottom plate. A cylindrical inner space is provided. Further, in order to insert the buried bolt in the center of the bottom plate, a circular hole having the above-mentioned allowance is formed. This is the second hexagonal fitting.

This metal piece is inserted into the tip of one of the embedded bolts from the side of the circular hole provided in the bottom plate, and the nut is inserted into the inner space to fix the embedded bolt at a predetermined position in the threaded section of the embedded bolt. When the hexagonal fitting is tightened on the mating cylindrical fitting, it is rotated by a spanner, so that this embedded bolt is strongly tightened and connected so that it is brought closer to the mating bolt.

Further, regarding the shape of the cavity forming die for tightening the joint metal fitting, since the hexagonal joint metal fitting is rotated and tightened by a spanner, it has a wide C-shape on the inner surface side of the tunnel in a front view. The mortar that is filled and finished does not fall off after hardening because it has an inverted V shape laterally.

[0017]

As described above, the buried bolt in the RC lining material is set at the correct position from the beginning in the concrete manufacturing factory. The tightening is performed with a cylindrical joint metal fitting and a hexagonal joint metal fitting that are more precisely than the tensile force of the bolt and are precisely manufactured. The former is fixed up to the screw end of one of the embedded bolts, and the latter is rotated with a spanner while the inner surface of the bottom plate of its inner space is in contact with one surface of the nut fixed in place, and is strongly tightened to the other side. . Since the head of the buried bolt is set in the concrete, the tensile force generated by the external force works effectively on the entire RC lining material by connecting the surrounding concrete to the distribution bar and the main reinforcing bar.

By changing the position of the buried bolt to the height in the thickness direction of the RC lining material, it is possible to increase the proof stress due to an external force.

Since the hexagonal joint hardware is set with a margin, there is no problem in construction.

[0020]

Embodiments will be described with reference to the drawings.

[Fig. 1] shows a ring, which was named A, B1, B2, and K, when a tunnel was recently excavated with a normal shield machine in Japan and a 4-part lining material was assembled as an RC lining material in the machine. Since it is used, it will be described by its name.

[Fig. 4]

FIG. 5 is the same. (A) is a view of the three rings assembled in a cylindrical shape in the shield machine as seen obliquely. The dotted line in the figure shows an example of equal quadrant lining material. (B) is a front view when assembled in a cylindrical shape as shown in the above figure. (C) is an enlarged view when A and B1 are assembled. (D) is a development view of the above figure from the outside. (E) is sectional drawing of CC and DD of the above figures (c) and (d). (Note) In the above (c), (d) and (e), the embedded bolt 3 of the present invention, the joint fastening space 9 and the like are schematically shown.

[0021]

FIG. 2 (a) is a side view (cross-sectional view) of an RC lining material joint portion, in which RC lining materials 1 are joined and joined at opposing joint surfaces 2. Since the head side of the embedded bolt 3 is set to the inner side of the concrete, the screw 7 at the tip thereof is exposed in the space 9 for tightening the joint metal fitting. A cylindrical joint fitting 5 is fixed to the screw 7 of one of the connecting sides. On the other hand, a hexagonal joint metal fitting 6 is inserted into the other embedded bolt 3 and a nut 4 is inserted into the inner space of the hexagonal fitting hardware 6 to fix the screw 4 at a predetermined position. The tip (the one closer to 5)
The female screw 8 corresponding to 8 of 5 is attached to.

Since all of the above screws are screws in the same direction, when 6 is rotated and tightened with 5, one side of nut 4 rotates while contacting with the inner surface of the bottom plate of 6, so that 4 moves freely. May occur. Therefore, 4 is fixed to the predetermined position of the threaded portion of 7 to secure the tightening effect of 5 and 6.

[0023]

2B is a cross-sectional view taken along the line AA in FIG. 2A, and there are various methods for fixing 4 other than by welding, but here, the nut 4 has one or two female screws. A small hole with a hole is provided, and 10 bolts for preventing rotation are provided at the above-described predetermined positions from 11 circular holes provided in 6 to the screw portion of 7 to fix the method.

Above

And

2] As shown in (a) and (b) of FIG.
The allowance of the diameter of 3-1 and the diameter of D4-1 with respect to D4 is defined in "Standard segment for shield construction" by the Japan Society of Civil Engineers and the Japan Sewer Association, which is a fitting for the diameter of the tightening bolt in the conventional method. The diameter of the circular hole should be within the margin. This will not hinder construction. Also, since fittings and the like do not project from the joint surface during construction, there is no problem.

[0025]

In the embodiment shown in FIG. 3, a shape of a die for forming a cavity for tightening a joint metal object of an RC lining material is shown, and is shown as an example of a construction method of a die, a buried bolt 3 and the like.

[0026]

3 (a), (b), and (c) of the embodiment of FIG. 12 is the main body of the formwork, 1
Reference numeral 4 is a die for forming a space for tightening a joint metal fitting, which is made of steel or hard rubber. Pedestal 13 of 14 is 12
It is fixed to. A shape in which 13 is used as a pedestal and is combined with 14 is the joint hardware tightening space 9. R
C lining material 1

Since it has a cylindrical shape as shown in FIG. 1, all surfaces in contact with 12 of 13 are circular. In addition, in the case of a circumferential joint, there are several types of shapes such as the joining surface 2 that is cut obliquely with respect to the cylindrical shape. To this end, 13 is made by precision machining to conform to its shape.

Reference numeral 15 is a metal fitting for fixing 3 and 14,
Reference numeral 16 is fixed to 12, and a part necessary for attaching and detaching 15 is removable with bolts or the like. Both (a) and (b) show the state where 15 is set to 14 or 3. After hardening the concrete,
15 is moved to the right by the screw 15-1 in 16 so that its left end is displaced to the right of the joint surface 2 of the main body 12 of the mold. Further, the screw 17 with 14 and the screw 7 with 3 are easily disengaged at the same time when the right hand is moved by this rotation. The RC lining material 1 thus cured is demolded from 12, 13 with 3 and 14 still incorporated therein. After that, since 14 has 18 margins, it can be easily removed from the tip of the exposed portion of the buried bolt 3.

In the method of setting 14 or 3, first, 14 is placed on 13, and 15 is fixed with 17 screws. 3 is inserted into the circular hole with a margin of 18 in 14 and is turned clockwise to the female screw 7 in 15 to be set at a predetermined position. 1
Cement milk penetrates into the margin circular hole 8 when pouring concrete, so it is necessary to put sponge or soft rubber near the entrance.

(C) is a front view of the die, and 3 is embedded in the center thereof. The connecting fittings 5 and 6 are shown in dotted lines. Since the front shape is a V-shape, it is easy to rotate 6 with a wrench at the time of construction.

[0030]

[Fig. 4]

[FIG. 5] is a schematic view of the one recently constructed in Japan as described above, and the name of the four-part lining material is used as it is.

FIG. 4 is a developed schematic diagram thereof. (Dotted line shows an example of equal quadrant lining material.)

[Fig. 5] RC inside shield machine during tunnel construction
It is a schematic diagram of the assembly state of a lining material. The white arrow pointing to the left indicates the excavation direction of the shield machine. The black arrows pointing to the right are A and B.
1 and B2 are assembled and finally the insertion direction of K is shown, and four pieces are connected to form a one-ring cylindrical tunnel.

[0031]

The present invention has the following effects because it is combined with the above-described structure and has a shape of a fastening space.

The buried bolt 3 having a diameter and length required for strength is set in advance in the concrete of the RC lining material, and the tip of the screw 7 is exposed in the space 9 for tightening the joint metal fitting. Since it is strongly connected by the cylindrical joint hardware 5 and the hexagonal joint hardware 6, the joint surface 2 does not have yield deformation of the steel plate in the conventional method, and the strength itself of the buried bolt resists external force. The strength becomes extremely strong. In addition, the joint between rings (in the axial direction of the tunnel) is much smaller in tensile force than the joint between the pieces (in the circumferential direction of the tunnel), and the strength transmission content is different. Can be converted.

In the conventional method

6 (b), (c), and (d) are cross-sectional views of the fittings taken from the one embedded as 19 in the RC lining material of (a). Most of these are hand-welded. Compared with this, the above-mentioned buried bolt 3
Is very cheap because it is one of the appropriate length. Further, both the cylindrical and hexagonal joint metal fittings 5 and 6 according to the present invention are capable of automatically cutting commercially available steel rods by a machine, and the inner and outer surfaces thereof can be precisely machined by a recent NC operation machine tool. By, it is almost unmanned (labor-saving), accurately,
And it can be manufactured at low cost.

When the material cost for increasing the rigidity and workability in a concrete factory and the workability of the reinforcing bar in the RC lining material are comprehensively summarized, the conventional joint metal fittings according to the present invention are as follows. Is excellent in all respects. It is also excellent in workability in the tunnel.

[Brief description of drawings]

FIG. 1 is a schematic diagram of RC lining material constructed recently in Japan.

It is

[Fig. 2]

FIG. 1 is a cross-sectional view of a joint metal fitting for connecting an RC lining material according to the present invention, which is shown in a straight line as an enlarged view of an X portion in (b).

FIG. 3 is a cross-sectional view showing the shape of the blank for forming a cavity for tightening the joint metal fitting.

[Figure 4]

FIG. 1 is a developed schematic view of a 4-division lining plate described in FIG. (Dotted lines are equally divided into 4)

FIG. 5 is a schematic view of an assembly state in a shield machine at the time of tunnel construction using the above-mentioned 4-division lining plate.

FIG. 6 is an example of a joint metal fitting for connecting RC lining material in a conventional method. (A) is

FIG. 2 is a similar enlarged side view. (B), (c), (d)
[Fig. 6] is a sectional view of the joint metal fitting 19 in (a).

[Explanation of sign]

DESCRIPTION OF SYMBOLS 1 RC lining material 1-1 Main reinforcement in RC lining material, 1-2 Power distribution bar on the same left 2 Joint surface (of RC lining material) 3 Buried bolt D3 Buried bolt diameter, D3-1 6 (below ) Diameter of the circular hole in the bottom plate 4 Nut of the embedded bolt 3 D4 Long diameter of the nut 4 of D3, D4-1 D4 6 (below) cylindrical diameter Inner diameter of the inner space 5 Cylindrical joint fitting 6 Hexagon joint fitting 7 Screws for the buried bolt 3 8 Screws for tightening 5 and 6 9 Space for tightening joint fittings 10 Bolts for preventing friend rotation 11 Circular holes for fixing the bolts of 10 12 For formwork (for RC lining material) Main body 13 14 pedestal 14 Joint metal fitting tightening cavity forming die 15 3 Fixing metal fitting 15 3 and 14 15-1 Screw for moving 15 left and right to set 15 Metal fitting fixed to 12 for setting 15 17 15 fix 14 That the screw 18 3 allowance circular hole 19 bolt and nut 21 (the conventional method) cavity for fastening fittings hardware for (the conventional method) fitting hardware 20 (conventional in construction method) clamped against the 14

Claims (2)

[Claims] Claim: What is claimed is: 1. When assembling an RC lining material (1) in a shield machine for excavation, a burying bolt (3) is previously placed in concrete at a predetermined position on the joint surface (2) in order to assemble the RC lining material. It is embedded and the screw (7) at its tip is exposed in the tightening space (9). A structure in which the cylindrical joint hardware (5) and the hexagonal joint hardware (6) are fixed by using the screw (7) and are firmly connected by screws (8) separately provided to (5) and (6). 2. A joint metal fitting made by combining a pedestal (13) fixed to a main body (12) of a cavity forming die for tightening a joint hardware and a cavity forming die (14) for tightening a joint hardware. It is the shape of the fastening cavity (9). It has an inverted V shape on the inside surface of the tunnel, as shown in FIGS. 2 (a) and 3 (a). It has a miniaturized shape to the minimum necessary.
Also, a construction method that facilitates installation and removal so that the buried bolt (3) can be set securely.