JP2005194813A - Connecting metal fitting for concrete segment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connecting metal fitting for concrete segments capable of suppressing a lowering of watertightness between the concrete segments by sufficiently coping with locally acting large load without enlarging a connecting metal fitting itself extremely. <P>SOLUTION: In this connecting metal fitting for the concrete segments, a connecting metal fitting body 1 is integrally provided with a bolt insertion part 2 with a bolt insertion hole 3 opened to a body front end face 1a, and a plurality of anchor connecting parts 4 for connecting anchor members 6 in the backward extended state, and the connecting metal fitting body 1 is used embedded in the concrete segments, exposing the body front end face 1a from the connected faces of the concrete segments. From the axis L1 direction view of the bolt insertion hole 3, the bolt insertion part 2 and the plurality of anchor connecting parts 4 are all located inside the body front end face 1a, and a plurality of anchor members 6 connected to the anchor connecting parts 4 extend outward toward the rear side. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  In the present invention, the connection fitting main body is integrally provided with a bolt insertion portion provided with a bolt insertion hole that opens to the front end surface of the main body, and a plurality of anchor connection portions that extend and connect the anchor member backward, The present invention relates to a connecting bracket for a concrete segment that is used by connecting an anchor member to an anchor connecting portion, exposing the front end surface of the main body from the connecting surface of the concrete segment, and embedding it in the concrete segment.

Conventionally, as shown in FIG. 6, a bolt insertion portion 12 having a bolt insertion hole 3 is constituted by a truncated cone having a larger diameter toward the rear side, as shown in FIG. 14 is constituted by a substantially similar truncated cone, and the bolt insertion part 12 and the anchor connection part 14 are integrally connected via a substantially plate-like support part 11.
In this conventional connecting fitting, the plurality of anchor connecting portions 14 are disposed in a state of being retracted rearward from the bolt insertion portion 12, and the plurality of anchor members 6 connected to the respective anchor connecting portions 14 are substantially parallel. It is comprised so that only the front end surface 12a of the bolt insertion part 12 may be exposed from the connection surface F of the concrete segment CS, and it may be embedded and used in the concrete segment CS (for example, refer patent document 1). .

JP 2001-355395 A

However, when the concrete segments CS are connected using the conventional connecting metal fittings, the connecting surfaces F of the concrete segments CS tend to be separated from each other as shown by phantom lines in FIG. There is a risk that watertightness may be hindered.
That is, as shown in FIG. 1, a large load W may act locally on the tunnel T. When a large load W acts on the tunnel T, the connection of the concrete segment CS at the position where the load W is applied. Faces F try to separate.

In order to counteract the separation force, a tensile force indicated by an arrow A acts on the bolt insertion portion 12 and a tensile force indicated by an arrow B acts on each anchor connecting portion 14, and as a result, each support portion 11 moves to an arrow. Try to bend in the direction indicated by C.
In that case, since each support part 11 is a comparatively thin plate shape in the conventional connection metal fitting, there exists a tendency for the connection surfaces F of both concrete segments CS to leave | separate by all means, and thereby the watertightness between both the segments C falls. There is a drawback of doing.

In order to eliminate such a defect, for example, it is conceivable that the support portion 11 is made very thick so that it can sufficiently resist the load W acting locally.
However, when trying to make such a configuration, the connecting metal fitting itself becomes very large, resulting in an increase in cost.

  The present invention pays attention to such a conventional problem, and its purpose is to sufficiently resist a large load acting locally without increasing the size of the connecting metal itself, and to concrete. It is an object of the present invention to provide a concrete segment connecting bracket that can suppress a decrease in watertightness between segments.

  According to a first characteristic configuration of the present invention, a connecting metal fitting main body includes a bolt insertion portion provided with a bolt insertion hole that opens to a front end surface of the main body, and a plurality of anchor connection portions that extend and connect an anchor member backward. A joint fitting for a concrete segment, which is integrally provided, wherein an anchor member is coupled to the anchor coupling portion, the front end surface of the main body is exposed from the coupling surface of the concrete segment, and is embedded in the concrete segment. In the axial direction view of the hole, the bolt insertion part and the plurality of anchor connecting parts are all located inside the front end surface of the main body, and the plurality of anchor members connected to the anchor connecting part are outward toward the rear side. It is in a place that is configured to spread.

According to the first characteristic configuration of the present invention, the plurality of anchors that connect the bolt insertion portion provided with the bolt insertion hole and the anchor member in the axial direction of the bolt insertion hole through which the bolt for connecting the concrete segment is inserted. All of the connecting portions are configured to be located inside the main body front end surface of the connecting metal fitting body.
That is, when the connecting metal fitting body is embedded in the concrete segment, there is only one connecting metal fitting body so that all of the bolt insertion part and the plurality of anchor connecting parts are located inside the main body front end surface exposed from the connecting surface of the concrete segment. Therefore, the deformation between the bolt insertion portion and the anchor connection portion is suppressed.
Nevertheless, since the plurality of anchor members coupled to the anchor coupling portion are configured to spread outward toward the rear side in the axial direction of the bolt insertion hole, the connection of the coupling metal body to the concrete segment is extremely strong. It will be a thing.
As a result, it is possible to firmly connect the concrete segments without enlarging the connecting bracket itself, and even if a large load is applied locally, the concrete segments can sufficiently resist the load. It is possible to suppress a decrease in watertightness between the two.

  According to a second characteristic configuration of the present invention, the plurality of anchor connecting portions are arranged at substantially equal intervals around the bolt insertion hole as viewed in the axial direction of the bolt insertion hole.

  According to the second characteristic configuration of the present invention, the plurality of anchor connecting portions are arranged at substantially equal intervals around the bolt insertion hole in the axial direction view of the bolt insertion hole. The connection of the main body is arranged at substantially equal intervals around the bolt insertion hole, and is further strengthened by a plurality of anchor members spreading outward toward the rear side, and as a result, the connection between the concrete segments is further ensured. Become.

  According to a third characteristic configuration of the present invention, a total of two anchor connection portions are arranged on opposite sides of the bolt insertion hole as viewed in the axial direction of the bolt insertion hole, and the anchor connection portion includes A total of two anchor members connected are configured to spread outward at substantially the same angle with respect to the axis of the bolt insertion hole.

According to the third characteristic configuration of the present invention, a total of two anchor connecting portions are arranged on opposite sides with respect to the bolt insertion hole as viewed in the axial direction of the bolt insertion hole. The two anchor members are used and embedded so that the two anchor members are positioned in a direction perpendicular to the thickness direction of the concrete segment, so that the connection of the connecting bracket body to the concrete segment is reliable and strong. It can be.
And since a total of two anchor members connected to the anchor connecting portion are configured to spread outward at substantially the same angle with respect to the axis of the bolt insertion hole, the connecting force of the connecting bracket body to the concrete segment Are equalized in the direction in which the two anchor members are arranged, and a reliable connection appears.

  The 4th characteristic structure of this invention exists in the place where the said connection metal fitting main body is a block made from cast iron.

  According to the fourth characteristic configuration of the present invention, since the connection fitting main body is a cast iron block, it can be manufactured at a relatively low cost while having the rigidity necessary for the connection fitting for the concrete segment, It also contributes to cost reduction.

An embodiment of a connecting fitting for a concrete segment of the present invention will be described based on the drawings.
As shown in FIG. 1 and FIG. 5, this connecting metal fitting is embedded in the connecting surface F of the arc-shaped concrete segment CS, and the adjacent concrete segments CS are connected to each other so that a tunnel for subway or water and sewerage can be formed. It is used to build.
The main body 1 of the connecting metal fitting is made of a cast iron block. As shown in FIGS. 2 to 4, one bolt insertion portion 2 and a total of two anchor connection portions 4 are integrally provided, and the bolt insertion portion 2. Are provided with bolt insertion holes 3, and each anchor connection portion 4 is provided with an anchor connection hole 5 made of an internal thread.

When viewed from the front end face 1a side of the main body, the connecting metal fitting body 1 has a substantially rectangular shape that is long in the lateral direction as shown in the front view of FIG. 3, and when viewed from the upper surface side, the plan view of FIG. As shown, it is a rectangle that is long in the lateral direction, and has a shape in which a part of the bolt insertion portion 2 protrudes backward.
Therefore, the rear end surface of the coupling metal body 1 includes a rear end surface 1b that protrudes rearward substantially parallel to the front end surface 1a of the main body, and side rear end surfaces 1c that are located on both sides of the rear end surface 1b. The bolt insertion hole 3 passes through substantially the center of the coupling metal body 1 and opens to the main body front end surface 1a and the protruding rear end surface 1b, and the anchor connection hole 5 opens only to the side rear end surface 1c. .

That is, the connecting metal fitting body 1 is a solid block made of cast iron, and has a structure in which a bolt insertion hole 3 and an anchor connecting hole 5 are formed in the solid block. As shown in FIG. The entire front end face 1a of the metal fitting body 1 is set so as to be exposed from the connection surface F of the concrete segment CS when the metal fitting body 1 is embedded in the concrete segment CS.
And in the direction view along the axial center L1 of the bolt insertion hole 3, one bolt insertion part 2 and two anchor connection parts 4 are inside the main body front end face 1a exposed from the connection surface F of the concrete segment CS. All are configured to be located.

In addition, the two anchor connecting portions 4 in total have the bolt insertion holes 3 arranged at substantially equal intervals around the bolt insertion holes 3 when viewed in the direction along the axis L1 of the bolt insertion holes 3. It arrange | positions so that it may be located in the mutually opposite side as a center.
The anchor connection holes 5 provided in each anchor connection portion 4 have an axis L2 having substantially the same inclination angle with respect to the axis L1 of the bolt insertion hole 3, for example, 15 ° in plan view. Therefore, when the anchor member 6 made of a steel bar is screwed and attached to each anchor connecting hole 5, both anchor members 6 are substantially the same in the direction along the axis L <b> 1 of the bolt insertion hole 3. It is configured to spread outward at an angle.

Next, a procedure for connecting the concrete segments CS to each other using the concrete segment connecting bracket will be described.
The concrete segment CS is manufactured in advance in a factory or the like with a necessary number of connecting metal fittings 1 embedded in the connecting surface F, and as shown in FIG. A working space 7 for tightening bolts and nuts is formed.
In such a concrete segment CS, the connection fitting main bodies 1 are arranged so that the connection fitting main bodies 1 face each other, the bolts 8 are inserted from the bolt insertion holes 3 of one connection fitting main body 1, and the bolt insertion holes of the other connection fitting main body 1 are inserted. The nut 9 is screwed and tightened to the bolt tip protruding from 3, and the adjacent concrete segments CS are connected to each other.

[Another embodiment]
(1) In the previous embodiment, the connecting metal fitting body 1 is embedded in both concrete segments CS to be connected, the bolts 8 are inserted between the connecting metal fitting bodies 1 of the both concrete segments CS, and tightened by the nut 9 to be connected. Although the connecting metal fitting body 1 is embedded in one of the two concrete segments CS and the nut member is embedded in the other, the bolt 8 inserted into the bolt insertion hole 3 of the connecting metal fitting body 1 is inserted into the nut member. It can also be configured to be connected by screwing.

(2) In the previous embodiment, the connection fitting main body 1 integrally including one bolt insertion portion 2 and two anchor connection portions 4 has been shown, but the bolt insertion portion 2 provided in the connection fitting main body 1 The number of anchor connecting portions 4 can be set arbitrarily.
For example, one bolt insertion part 2 and three or more anchor connection parts 4 may be integrated to form the connecting metal fitting body 1, or two bolt insertion parts 2 and two or more anchor connection parts 4. It is also possible to configure the connecting bracket main body 1 by integrating the above.
Further, the two or more anchor connecting portions 4 do not necessarily need to be arranged at substantially equal intervals around the bolt insertion hole 3 when viewed in the direction of the axis L1 of the bolt insertion hole 3, and further, the connecting metal fitting body 1 itself Also, for example, it is not limited to cast iron, and for example, it can be manufactured from a lump of metal by machining.

Perspective view of tunnel constructed with concrete segments Perspective view of connecting bracket for concrete segment Front view of connecting bracket for concrete segment Plan view of connecting bracket for concrete segment Cross section of connecting bracket for concrete segment Sectional view of a conventional metal fitting for a concrete segment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Connection metal fitting body 1a Front end surface of main body 2 Bolt insertion part 3 Bolt insertion hole 4 Anchor connection part 6 Anchor member CS Concrete segment F Connection surface of concrete segment L1 Axle of bolt insertion hole

Claims (4)

The connecting metal fitting body is integrally provided with a bolt insertion portion having a bolt insertion hole that opens to the front end surface of the main body, and a plurality of anchor connection portions that extend and connect the anchor member to the rear, and the anchor connection portion includes A connecting bracket for a concrete segment that connects an anchor member, exposes the front end surface of the main body from the connecting surface of the concrete segment, and is embedded in the concrete segment.
In the axial direction view of the bolt insertion hole, the bolt insertion portion and the plurality of anchor connecting portions are all located inside the main body front end surface, and the plurality of anchor members connected to the anchor connecting portion are on the rear side. A concrete segment connecting bracket that is configured to spread outward.   2. The connection fitting for a concrete segment according to claim 1, wherein the plurality of anchor connection portions are arranged at substantially equal intervals around the bolt insertion hole as viewed in the axial direction of the bolt insertion hole.   In the axial direction view of the bolt insertion hole, a total of two anchor connecting portions are arranged on opposite sides around the bolt insertion hole, and a total of two anchor members connected to the anchor connecting portion are: The connection fitting for a concrete segment according to claim 2, wherein the connection fitting is for a concrete segment so as to spread outward at substantially the same angle with respect to the axis of the bolt insertion hole. The said connection metal fitting main body is a block made from cast iron, The connection metal fitting for concrete segments of any one of Claims 1-3.

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