JPH0626634Y2 - Joint structure of concrete segment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a joint structure of a concrete segment used when constructing a wall body such as a tunnel for a railway and a road or an underpass.

[Prior Art] Conventionally, in the case of constructing a wall body such as a tunnel or an underground passage, generally, a plurality of arc-shaped concrete segments which are tubular in a connected state are used, and the segment is excavated in the ground. This is done by connecting sequentially.

As a joint structure of the concrete segments joined in this way, for example, one shown in FIG. 8 is known. Specifically, the joint end faces 2, which are connected to each other,
Recesses 3, 3 are provided in the vicinity of 2 respectively, and a bolt insertion hole 5 that intersects the joint end faces 2, 2 between the inner surface 6, 6 of one side of the recesses 3, 3 facing the joint end faces 2, 2. A pair of concrete segments 1 and 1 formed by penetrating the above are joined by screwing the bolt tip through the bolt 19 into the bolt insertion hole 5 and the nut 18.

In such a joint structure, the joining end faces 2, 2 of a pair of concrete segments 1, 1 are usually aligned, and in this state, the recess 3 of one concrete segment 1
9 is passed through the insertion hole 5 to project the tip of the bolt into the recess 3 of the other concrete segment 1, and then a nut 18 is introduced into the recess 3 to screw it into the bolt tip. Has been obtained.

[Problems to be Solved by the Invention] However, according to such a joint structure, since recesses are formed in both segments, the strength is unsatisfactory. That is, specifically, when both segments are connected in a cylindrical shape and subjected to a force such as a shearing force or a bending moment due to an external pressure such as earth pressure, the head of the bolt and the nut are large on the inner surface of the recess. It works by contacting and pressing in under pressure. Then, when this pressure becomes large, there arises a problem that the joint strength is insufficient and the joint surface is displaced.

Moreover, since one end of the bolt has a structure in which the bolt head is simply locked to the inner surface on one side of the recess, if the screwing with the nut at the other end loosens due to some trouble, However, there was also a concern that the above-mentioned segment would be disconnected or loosened.

In addition, if the thickness of the flange between the joint end face and the recess is increased in order to increase the strength of the joint structure of this segment, a long bolt is inevitably required as the flange thickness increases. Therefore, in the actual joining work,
A long bolt was introduced into the narrow recess, and the bolt was forced to be inserted from the recess into the insertion hole, resulting in dissatisfaction with extremely poor workability.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a concrete segment joint structure having sufficient strength and excellent workability when joining concrete segments to each other.

[Means for Solving the Problem] In the present invention, a recess is provided in one of the concrete segments in the vicinity of the joint end face, and an insertion hole penetrating from the recess toward the joint end face is formed. A through hole is formed in the concrete segment from the joint end face toward the inside, and a bottomed cylindrical reinforcing member that covers at least the tip of the through hole is embedded in the inner wall of the through hole, and the inner wall of the through hole is formed. An engaging member having a multi-step engaging protrusion that protrudes in a sawtooth shape toward the tip of the insertion hole is provided in a part of the above, and the pair of concrete segments are connected to each other so that the insertion holes communicate with each other. By inserting the pin into the insertion hole, the multi-step engagement projection provided on the tip of the pin and protruding in a sawtooth shape toward the base is engaged with the engagement projection of the engagement member, Outside the proximal end A solution means is to connect the pair of concrete segments by screwing a screw portion provided on the peripheral portion with a nut on the inner surface on one side of the recess.

[Operation] According to the joint structure of the concrete segment of the present invention,
One of the segments does not have a recess as in the past and is embedded with a reinforcing member, so the strength of the segment is improved and high joint strength can be maintained over a long period of time. it can. Specifically, for example, when the segment receives a force such as a bending moment due to an external pressure such as earth pressure, a local pressure applied to the segment by the pin is received by the reinforcing member. By making this reinforcing member large enough to receive this pressure, the surface pressure on the segment becomes small, and therefore, the reinforcing effect can be obtained with almost no damage such as cracks occurring in the segment.

The engaging projection provided on the tip of the pin that joins the pair of segments is multi-stepped and protrudes in a sawtooth shape toward the base end of the pin. In the state in which the engaging projections are engaged by being pushed into the member, the movement of the pin in the direction opposite to the insertion direction is suppressed, and since the engagement is multi-staged, reliable and strong joining is ensured. Will be realized.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

FIG. 1 shows the whole joint structure of this concrete segment.

In the drawing, reference numeral 1 is a concrete segment (hereinafter abbreviated as a segment), and each segment 1, 1 is an end face in the circumferential direction or axial direction (in this example, only in the circumferential direction).
Substantially cylindrical segment units are formed by joining together at 2 and 2.

As shown in FIG. 2, a recess 3 is provided on the inner surface side of one of the segments 1a near the joint end surface 2a, and the flange portion 4 between the recess 3 and the joint end surface 2a has an insertion hole 5a. Are formed through. Further, in this example, a perforated disk-shaped reinforcing member 7 is embedded in the inner surface 6 of the recess 3 facing the joining end surface 2a with its hole aligned with the end of the insertion hole 5a. ing.

The other segment 1b is formed with an insertion hole 5b that extends inward from the joint end surface 2b, and the inner wall of the insertion hole 5b has a cylindrical support plate 8a for reinforcement at the end that covers at least the tip of the insertion hole. The reinforcing member 8 is embedded. In this example, as shown in FIG. 3, a cylindrical reinforcing member 9 is embedded in close contact with the bottomed cylindrical reinforcing member 8 and covers the vicinity of the intermediate portion of the insertion hole 5b. The cylindrical reinforcing member 9 is provided with a recess 10 on the inner surface of the end face which is in contact with the bottomed cylindrical reinforcing member 8. The recess 10 is formed by removing the inner surface of the reinforcing member 9 over the entire circumference, and the engaging member 11 is disposed in the recess 10.

The engagement member 11 has a substantially ring shape, and as shown in FIG. 3, the engagement member 11 has a multi-stage engagement that extends circumferentially inward and in a sawtooth shape inward toward the tip of the insertion hole 5b. It has a protrusion 12. Unlike the so-called screw, the engaging projections 12 are separate one-step and one-step projections formed over the entire circumference. The engaging member 11 may be disposed in the recess 10 of the cylindrical reinforcing member 9 as in this example, but may be formed as a part of the reinforcing member 9.

Then, in the state where the pair of segments 1a, 1b communicate with the respective insertion holes 5a, 5b and are aligned on the respective joint end faces 2a, 2b, the communication insertion hole 5 is formed, and the pin 13 is inserted into the insertion hole 5. Has been inserted.

The pin 13 is a rod having such a length that it penetrates the insertion hole 5 and one end thereof protrudes from the end of the insertion hole 5. As shown in FIG. The engagement member 11 extends circumferentially and protrudes outward and toward the base end in a sawtooth shape.
It has a multi-stage engagement protrusion 14 that engages with the engagement protrusion 12 of FIG. 1, and a screw portion 15 is formed on the outer peripheral portion of the base end portion. Here, the engagement protrusion 14 is different from a so-called screw like the engagement protrusion 12 of the engagement member 11, and is a separate one-step protrusion formed over the entire circumference.

The pin 13 is also provided with a locking groove 16 at its base end for preventing rotation. As shown in FIGS. 4 and 5, the locking groove 16 may be two grooves formed on both sides of the outer peripheral surface of the base end portion and extending from the base end portion toward the distal end portion. Alternatively, as shown in FIGS. 6 and 7, it may be a substantially rectangular groove formed in the vicinity of the inner center of the base end portion, or may be of any other shape. In the pin 13 having these locking grooves 16, for example, when the pin 13 has the locking grooves 16 having the shapes shown in FIG. 4 and FIG. And a locking jig for fixing which is used at the time of screwing a nut, which will be described later, is used.
When the locking groove 16 having the shape shown in the figure is provided, rectangular locking jigs that fit into the rectangular grooves are used, and these locking jigs are fitted into the locking groove 16 of the pin. By aligning them, the rotation of the pin 13 can be suppressed, and if the screwing work described below is performed in this state, the pin 13 will not rotate and the work can be performed stably and efficiently. become.

In addition, the tip of this pin 13 has one segment 1b.
The engaging projection 14 of the pin is engaged with the engaging projection 12 of the engaging member 11 in a state of being inserted into the through hole 5 toward the reinforcing member 8 and the base end portion thereof. Is projected into the recess 3 of the other segment 1a, and is locked to the inner surface of the perforated disc-shaped reinforcing member 7 embedded in the recess 3 via washers, washers, etc. Further, the nut 18 is screwed to obtain the segment joint structure of this embodiment, and one segment unit is constituted.

According to the segment joint structure of this example, no recess is formed in one segment 1b, and
Since each reinforcing member is embedded in 1a, 1b,
Due to these synergistic effects, a high reinforcing effect is achieved, and the local load that the segments 1a and 1b receive from the pin 13 is reduced, which makes it possible to stabilize the joining strength and joining state over a long period of time. Becomes

Further, in this example, since the one end of the pin 13 is joined by the engagement protrusion 14 provided on the pin tip and the engagement protrusion 12 of the engagement member 11 provided on the segment 1b, The movement of the pin 13 in the opposite direction to the insertion direction is suppressed,
Moreover, because of the multi-stage engagement, reliable and strong joining is realized.

Next, one construction example for obtaining the joint structure of this example will be described.

First, predetermined segments 1, 1 ... Are formed by casting.

These segments 1 are located near one end face in the circumferential direction,
It has a recess 3 and an insertion hole 5a extending from the recess 3 to the end face 2a, and the end face 2b on the opposite side of the recess 3 extends inward from the end face 2b and is joined with the respective joint end faces 2a, 2b. It is provided with an insertion hole 5b provided so as to sometimes penetrate therethrough.

Simultaneously with the driving of these segments 1, a perforated disk-shaped reinforcing member 7 is embedded in the inner surface 6 on one side facing the joint end surface of the recess 3 and the tip of the pin 13 is The pin 13 is inserted into the insertion hole 5a while protruding from the end surface 2a. By preliminarily holding the pin 13 on the one segment 1a in this manner, it is convenient for the subsequent joining work as described later.

Further, the insertion hole 5b formed on the other end surface of the segment covers a cylindrical bottomed cylindrical reinforcing member 8 that covers the vicinity of the tip end portion of the inner wall of the insertion hole 5b and the vicinity of the middle portion of the insertion hole 5b during casting. The reinforcing member 9 having a substantially cylindrical shape is embedded in close contact therewith, and further, the recess 10 provided in the inner surface of the portion where the reinforcing member 9 contacts the cylindrical reinforcing member 8 having a bottom has the above-mentioned engagement. Composite member 11
Are arranged by adhesion or the like.

And the respective joint end faces 2a, 1b of these segments 1a, 1b
2b are aligned with each other, and the pin tip portion protruding from the end surface 2a of one segment 1a is penetrated into the insertion hole 5b from the other end surface 2b to penetrate the insertion hole 5 that is in communication, and the engaging portion formed at the tip portion thereof. The mating protrusion 14 is forcibly pushed into the engaging member 11 arranged in the insertion hole 5b to engage the engaging protrusions 12, 14 with each other.
Engage each other and fix. The pushing operation of the pin 13 is usually performed by hitting the base end portion of the pin 13 from inside the recess 3 with a hammer or the like.

Next, the pin 13 protruding from the recess 3 into the recess 3
The nut 18 is screwed to the base end of the pin, and the screw portion 15 of the pin and the nut 18 are screwed together. In order to prevent rotation of the pin 13 during screwing, in a state in which an appropriate locking jig is fitted and fixed in the locking groove 16 provided in the base end portion of the pin 13,
A method of rotating the nut 18 with a hexagon wrench or the like is adopted.

Then, the adjacent joint surfaces are similarly sequentially connected, and a plurality of the segment units are connected in the circumferential direction and the axial direction to complete a cylindrical structure serving as a wall of a tunnel or an underground passage.

As described above, by holding the pin 13 on the segment 1a at the same time when the segments are cast, when the pair of segments 1a, 1b are connected together at the respective joint end faces 2a, 2b, the pin 13 protruding from the end face 2a. The tip of the other end
Since it suffices that the engaging projection 14 is engaged with the engaging projection 12 of the engaging member 11 arranged in the segment by inserting the engaging projection 14 from 2b into the insertion hole 5b, the workability is greatly improved. . That is, even if the long pin 13 is used, the unreasonableness and inconvenience are eliminated without causing the unreasonableness that the pin 13 goes right and left in the narrow recess 3 to hinder the progress of the work as in the conventional case.
Further, in this case, even if the pin 13 is long, the connecting work between the segments is not hindered, and accordingly, the thickness of the flange 4 of the segment and the volume of the recess 3 can be arbitrarily set. . Therefore, it is possible and convenient to increase the joint strength by increasing the flange thickness.

Here, an example of a method in which the pin 13 is locked to the segment 1 in advance when the segment is set and the segments 1 and 1 are connected to each other by using the segment 1 has been described. Alternatively, the pin 13 may be inserted into the insertion hole 5 again from the recess 3 in a state where the 1 and 1 are combined.

In this embodiment, the concrete segment is a segment assembled in a cylindrical shape, but the concrete segment can be applied to segments having other shapes.

[Effects of the Invention] As described above, according to the joint structure of the concrete segment of the present invention, one concrete segment is provided with a recess near its joint end face, and penetrates from this recess toward the joint end face. Through hole is formed in the other concrete segment, and a through hole extending inward from the joint end face is formed in the other concrete segment, and the inner wall of the through hole has a bottomed cylindrical reinforcing member that covers at least the vicinity of the tip of the through hole. In addition to embedding, in a part of the inner wall of the insertion hole, an engagement member having a multi-step engagement protrusion that protrudes in a sawtooth shape toward the insertion hole tip is provided, and a pair of these concrete segments at each joint end face. Aligning the insertion holes with each other, the pins are inserted into the communication holes that are in communication with each other, and the pins are provided on the outer periphery of the distal end of the pin and protrude in a serrated shape toward the base end. By engaging the engagement protrusion of the step with the engagement protrusion of the engagement member, by screwing the screw portion provided on the outer peripheral portion of the base end portion with the nut on the inner surface on one side of the recess, Since the pair of concrete segments are connected to each other, a simple joining operation completely prevents movement of the pin in the direction opposite to the inserting direction, and reliable and firm joining can be realized. Also, unlike the conventional case, it is not necessary to form a recess near both end surfaces, and even if an excessive external pressure is applied to this segment due to the action of the reinforcing member provided to cover the inner surface on one side of the recess and the inner wall of the insertion hole. This external pressure can be received by the reinforcing member even when is applied, the local load on the segment can be reduced, and high joint strength can be stabilized over a long period of time. .

[Brief description of drawings]

1 to 3 are views showing an embodiment of the present invention, wherein FIG. 1 is a perspective view of an entire segment, FIG. 2 is a sectional view showing a state in which the segments are connected, and FIG. FIG. 4 is a sectional view showing a state in which a tip end portion of a pin used in the present invention and an engagement member arranged in a segment are engaged with each other, and FIGS. 4 and 5 are base end portions of the pin. FIG. 4 is a side view, FIG. 5 is a plan view, and FIGS. 6 and 7 are configuration diagrams showing another example of the base end portion of the pin. FIG. 6 is a side view, FIG. 7 is a plan view, and FIG. 8 is a sectional view showing a connected state of a conventional segment. 1 ... Segment, 2 ... Joining end face, 3 ... Recess, 5a, 5b ... Insertion hole, 5 ... Insertion hole, 8 ... Reinforcing member, 11 ... Engaging member, 12 ... Engaging protrusion , 13 ... pin, 14 ... engaging projection, 15 ... screw part, 18 ... nut.

Claims (1)

[Scope of utility model registration request] 1. A recess is provided in the vicinity of a joint end surface of one of a pair of concrete segments connected to each other,
An insertion hole penetrating from this recess toward the joint end face is formed, and an insertion hole extending inward from the joint end face is formed in the other concrete segment, and at least the insertion hole tip end portion is formed on the inner wall of the insertion hole. A bottomed cylindrical reinforcing member that covers the vicinity is embedded, and a substantially cylindrical engagement member that has a multi-step engagement protrusion that projects in a sawtooth shape toward the tip of the insertion hole is formed on a part of the inner wall of the insertion hole. A mating member is provided, and a pair of these concrete segments are aligned with each other through the insertion holes at each joint end face, and a pin is inserted into the communication through hole. Has a multi-step engaging projection that protrudes in a sawtooth shape toward the base end thereof and engages with the engaging projection of the engaging member, and has a screw portion on the outer peripheral portion of the base end. The engagement of the tip of this pin The projection engages with the engagement projection of the engagement member, and the screw portion of the base end portion is screwed with the nut on the inner surface on one side of the recess to connect the pair of concrete segments. The joint structure of the concrete segment characterized by.