JP3960471B2 - Precast segment joining device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a technique for joining precast segments, which are units constituting a structure, for example, when a structure such as a bridge is constructed.
[0002]
[Prior art]
In the normal construction method (construction method other than the precast segment), a formwork is assembled and concrete is in contact with the site, followed by curing.
However, it takes a long time for concrete placement and curing, and when concrete placement and curing is performed on site, the entire construction period is prolonged.
[0003]
On the other hand, according to the precast segment construction method, reinforced concrete and prestressed concrete segments are manufactured at a segment production yard or factory near the site, so that the time required for concrete placement and curing at the site is not required. It can be manufactured in parallel with the work or before the construction work. Therefore, according to the precast segment construction method, the construction period can be greatly shortened compared to the normal construction method (construction method other than the precast segment).
[0004]
Here, when building a building using precast segments, there are no reinforcing bars between the segments, and there are no reinforcing bars between the segments, so if a tensile force acts on the joint, there is a gap in the joint. There is a problem that a so-called “opening” occurs.
[0005]
In order to suppress such “opening”, for example, when bonding with an epoxy resin, it is necessary to ensure a surface pressure applied during curing of the epoxy resin on the bonding surface. In order to ensure the surface pressure, it is necessary to apply a compressive force to the joint surface 1Ga between the segments 1G and 1G by the attracting steel material (steel bar) 9 as shown in FIGS.
Further, it is necessary to provide a concrete projection 30 on the segment body 1G for fixing the attracting steel material.
[0006]
Further, the attracting steel material (steel bar) 9 for applying compressive force to the joint surface and the concrete protrusion 30 are not related to the strength of the bridge itself, and are not only unnecessary, but also increase in weight and cost. It leads to increase.
[0007]
The above method is in a cantilever state at the time of construction, and the amount of deformation is large. To suppress “opening” in this state, it is necessary to increase “prestress”. For this reason, the amount of steel material increases.
[0008]
Furthermore, the cantilever method shown in FIG. 25 shows the construction method (segments J0, J1, J2, J3.. In the construction method), the steel rod 90 for overhanging is for supporting and moving the work table. The steel rod 90 for overhang is quite thick, and some of them are not necessary when completed, which is also uneconomical.
[0009]
[Problems to be solved by the invention]
The present invention has been proposed in view of the above-described problems of the prior art, and when joining precast segments constituting a bridge or the like, the gap between the segment joint surface pipes, so-called "opening" is prevented, Or, while controlling the “opening”, the amount of steel used is reduced, and it is not necessary to use a so-called “drawing steel” when pulling the precast segments to be joined together. The object is to provide a precast segment joining device that can be used.
[0010]
[Means for Solving the Problems]
According to the present invention, a male joint is fixed to one of the adjacent precast segments constituting the structure, and a female joint is fixed to the other. The joint 4 includes a male joint case 11 provided in one precast segment 1A, a joint bolt 12 provided in the male joint case 11, and a female thread portion having an inner diameter portion screwed with a thread portion 12a of the joint bolt 12. The male joint case 11 is open to the joint surface 1a side of one precast segment 1A, and the joint bolt 12 is inserted in the hole 11a so as to be movable in the axial direction. An anchor 11c is formed on the inner side of the precast segment of the male joint case 11. An incomplete thread 12b is provided on the inner side of the precast segment of the joining bolt 12, and the worm wheel 13 is formed in a male joint and meshes with the worm gear 15 inserted from the worm gear insertion hole 15a. Is a female joint case 21 provided on the other precast segment 1B, a nut 22 inserted in the female joint case 21 so as to be movable in the axial direction, and the nut 22 on the side of the joint surface 1b of the other precast segment 1B. And an opening-side end face 21d with which the nut 22 abuts, and the female joint case 21 has an opening 21a on the joint surface 1b of the precast segment 1B on the other side, and the inner side of the precast segment 1B. An anchor 21c is formed at the end.
[0011]
According to the present invention, in the precast segment joining apparatus for joining the precast segments, the male joint is fixed to one of the adjacent precast segments constituting the structure, and the female joint is fixed to the other. The male joint 2 includes a shaft portion 2a provided in one precast segment A, an anchor portion 2c provided on the segment inner side of the shaft portion 2a, and a storage chamber 2b provided on the joining surface Aa side of the shaft portion 2a. The housing chamber 2b accommodates a joining bolt 6 for joining the female joint 3 and a worm wheel 13A having an inner diameter portion screwed with a threaded portion 6c of the joining bolt 6, and the joining bolt 6 is a shaft. A segment 6a, a tip 6b at the outer end of the segment, and a head 6e at the segment inner end, and the threaded portion 6c is formed on the head 6e side. The back surface 6d of the tip 6b forms a locking surface with the female joint 3, the storage chamber 2b has a slightly larger cross section than the head 6e, and the joining bolt 6 is in the storage chamber 2b. The housing chamber 2b is formed with a worm gear insertion hole 15Aa for inserting a worm gear 15A for rotating the worm wheel 13A, and the other segment R has a shaft portion 3a and its shaft portion. A female joint 3 including an anchor portion 3c provided on the segment inner side of 3a and a joining bolt locking chamber 3b provided on the joining surface Ba side of the shaft portion 3a is embedded, and the joining bolt locking chamber 3b is opened. A slit 3s having an opening is formed on the other side, and a recess Bb into which the head 6b of the joining bolt 6 can be inserted is formed.
[0012]
According to the precast segment joining apparatus of the present invention, not only “full prestress design” for applying prestress to the entire precast, but also “partial prestress design” in which “opening” is controlled is possible.
Since “partial prestress design” is possible, the segment cross-section can be reduced, the capacity of PC steel can be reduced, and the cost can be reduced.
In addition, by controlling the “opening”, it is possible to expect an improvement in durability from the beginning of the design, which is useful for maintenance after completion.
[0013]
The conventional pulling steel material for temporary use and the concrete protrusion to fix the pulling steel material can be omitted (if the joint is grasped, the next segment is pulled, and the joint is inserted into the male and female when it reaches a predetermined position. Cost reduction).
[0014]
In the case of PC steel bars, the number is reduced from construction work, but it is difficult to introduce uniform surface pressure. On the other hand, in the present invention, by introducing the compressive force of the uniform joint surface, it becomes possible to design the durability and life in which the entire segment is balanced. That is, the use of members can be minimized.
In other words, the joints can be freely arranged so that a uniform fastening force acts on the entire segment joint surface.
[0015]
In the cantilever method, the joint can be used as a substitute for the overhanging steel material, so that the overhanging steel material can be omitted and the construction cycle can be made more efficient.
[0016]
After joining, the joint acts as a structural steel. The presence of the structural member between the precast segments can improve the yield strength and reduce the gap between the precast segments (so-called “mesh”).
[0017]
Even if the opening occurs, the opening can be closed by tightening the joint.
[0018]
In carrying out the present invention, it is preferable that the male joint (11E) and / or the female joint (21E) are coupled to a tension support member (for example, a reinforcing bar 18) extending in the joining direction of the precast segment (1E).
Here, if the tension supporting member and the joint (11E, 21E) are directly connected, it is a substitute for the overhanging steel material. With such a structure, the dispersibility of cracks is good.
[0019]
Even in the anchor type, if the material and structure between the anchor and the surface of the precast segment are devised, the steel material for extension, the steel material for drawing and the steel material for permanent installation can be substituted.
Here, if the anchor type is to embed male bolts or female nuts in concrete and transmit the tensile force acting on the entire beam, the shape of the compressive force of the concrete between the anchor part and the segment joint surface Therefore, a tensile force will be given.
[0020]
In the present invention, it is preferable that after the fastening step, the solidified material flows into the fastened male joint (4) and female joint (5).
Similarly, in the precast segments (1A, 1B) to which the male joint (4) and / or the female joint (5) are fixed, the solidified material is supplied to the inside of the fastened male joint (4) and female joint (5). It is preferable that a solidifying material supply channel (H1i, H2i) is formed.
When used as a structural member, if a mortar or a resin material (for example, epoxy resin) is supplied as a solidifying material, the worm gear does not rotate, so that it is prevented from loosening. Moreover, it is because the antirust effect is also acquired.
[0021]
When a joint member for joining joints (tensile support member extending in the joining direction of the precast segment: rebar 18) is provided (the male joint 11E and / or the female joint is embedded in the precast segment (1E) in an anchor shape. The sheath covering the joint member (11E) may or may not be provided.
When the sheath is provided, the tensile force acting on one end immediately acts on the joint member on the other end side. When the sheath is not provided, even if a tensile force acts on one end, the sheath member is attenuated by the adhesion force between the joint member and concrete and reaches the joint member on the other end side.
[0022]
When the joint is of the type shown in FIGS. 13 to 22 (second embodiment), the bolt (6) of the male joint (2) faces the axial center of the female joint (3) in the bolt insertion step. Prior to the fastening operation, the precast segment (A) to which the male joint (2) is fixed is slid to slide the bolt (6) of the male joint (2) to the eccentric position. It is preferable to move from the offset position to a position facing the axial center of the female joint.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
[0024]
First, a first embodiment of the present invention will be described with reference to FIGS.
1 and 2 show an alignment process for aligning a male joint fixed to one of the precast segments to be joined and a female joint fixed to the other, and inserting a bolt inside the male joint into the female joint. The initial process before starting is displayed.
[0025]
The left side of the figure is the male joint 4, and the right side is the female joint 5.
The male joint 4 includes a male joint case 11 provided in the segment 1A to be connected, a joining bolt 12 inserted into the case 11, and a worm wheel 13 screwed with the joining bolt 12.
The male joint case 11 opens to the joint surface 1a, and the joint bolt 12 is inserted through the hole 11a so as to be movable in the axial direction X. An anchor 11c is formed at the end of the male joint case 11 on the segment inner side, and serves to prevent the segment 1A from coming off.
[0026]
The threaded part 12 a of the joining bolt 12 is screwed with a female threaded part (not shown) formed on the inner diameter part of the worm wheel 13, and moves in the X direction by the rotation of the worm wheel 13. The joint bolt 12 turns to the right without rotating by the rotation of the worm wheel 13, and after the left end of the female screw portion (not shown) of the worm wheel 13 reaches the incomplete thread portion 12b of the joint bolt 12, the right row is stopped. The worm wheel 13 is configured to rotate.
[0027]
The worm wheel 13 is engaged with a worm gear 15 inserted from a worm gear insertion hole 15 a formed in a male joint, and rotates by rotating the worm gear 15.
[0028]
On the other hand, the female joint 5 includes a female joint case 21 provided in the existing segment 1B, a hex nut 22 inserted into the case 21, and a spring 23 as elastic means.
The female case 21 has an opening 21a in the joint surface 1b of the segment, and a hole 21b having a hexagonal cross section is formed on the inside thereof. A hexagonal nut 22 is fitted in the hexagonal hole 21b so as to be movable in the axial direction X. The nut 22 is inserted and biased in the opening direction by the spring 23. Furthermore, an anchor 21c is formed at the end portion of the female joint case 21 on the inner side of the segment, and serves to prevent the segment 1B from coming off.
[0029]
3 and 4, the worm wheel 15 provided in the male joint 11 is rotated by rotating the worm gear 15, and the joining bolt 12 is advanced in the direction of the female joint 21.
[0030]
5 and 6, the worm wheel 13 provided in the male joint case 11 is further rotated, and the tip of the joining bolt 12 is connected to a female screw portion (not shown) of the hexagon nut 22 inside the female joint 21. It abuts on the end.
On the other hand, the incomplete thread portion 12b of the joining bolt 12 reaches a female thread portion (not shown) of the worm wheel 13, and the worm wheel 13 and the joining bolt 12 are integrated to start rotating.
[0031]
When the joining bolt 12 starts to rotate, the female hex nut 22 cannot be rotated, so it is screwed into the joining bolt screw 12a and started to be pulled toward the male side.
[0032]
7 and 8, the worm wheel 13 is further reversed, the female hex nut 22 is pulled toward the male side, and the end face of the hex nut is brought into contact with the female inner opening inner end face 21d. When the worm wheel 13 is further rotated, the female joint 21 for each segment 1B is drawn to the male joint 11, and the joining surfaces 1a and 1b are brought into close contact with each other to complete the fastening.
[0033]
FIG. 9 is a view showing an aspect of fixing the joint 11D and the precast segment 1D, and is an example in which an anchor portion 11d is formed at the joint end and embedded in the segment 1D.
In the figure, 12D indicates a joining bolt.
[0034]
FIG.10 and FIG.11 is a figure which shows the other aspect in fixation of the joint 11E and the precast segment 1E, and the joint 11E of the both ends of the segment 1E is connected by the reinforcing bar (tensile support member 18 extended | stretched in the joining direction of a precast segment). It is a combination.
[0035]
FIG. 12 is a view showing a state in which cement milk (solidifying material) is supplied to the inside of the joined joint, and is substantially the same as the fastening completed state shown in FIGS.
[0036]
The male joint case 11 on the segment 1A side is formed with an injection hole H1i and an air vent hole H1o for injecting a solidified material into the hole 11b for storing the joining bolt 12.
[0037]
On the other hand, the female joint case 21 on the segment 1B side is formed with an injection hole H2i and an air vent hole H2o for injecting the solidified material into the hole 21b for storing the hexagon nut 22.
[0038]
When the male / female joint is completed, the solidification material, for example, cement milk is injected through the injection holes H1i and H2i to complete the construction contents.
[0039]
As described above, according to the precast segment joining method and apparatus according to the first embodiment, the “partial pre-stress is applied to the joining apparatus using the joints 4 and 5 that are part of the precasts 1A and 1B, which controls the“ opening ”. "Stress design" becomes possible.
Since “partial prestress design” is possible, the segment cross-section can be reduced and the capacity of PC steel can be reduced compared to “full prestress design” that applies prestress to the entire precast, thereby reducing costs.
Also, by controlling the “opening”, it is possible to expect an improvement in the durability of the entire structure from the beginning of the design, which is useful for maintenance after completion.
[0040]
Once the joints 4 and 5 are grasped and the next segment 1A (or 1B) is pulled to the predetermined position, the male and female joints 4 and 5 can be fitted. The steel protrusion and the concrete protrusion for fixing the drawing steel material can be omitted, and the cost can be reduced.
[0041]
The joints 4 and 5 can be freely arranged so that a uniform fastening force acts on the entire surface of the segment joining surfaces 1a and 1b, and a uniform compressive force of the joining surfaces 1a and 1b is applied to the joints 4 and 5. By doing so, it is possible to design the durability and life in which the entire segments 1A and 1B are balanced.
Therefore, the use of members can be minimized.
[0042]
When applied to the cantilever method, the joints 4 and 5 can be used as a substitute for the overhanging steel material, so that the overhanging steel material can be omitted and the construction cycle can be made more efficient.
[0043]
After joining, the joints 4 and 5 act as structural members. The presence of the structural steel material between the precast segments 1A and 1B improves the strength and eliminates a gap (so-called “open”) between the precast segments 1A and 1B.
[0044]
Even if a mesh opening occurs, the mesh opening can be closed by tightening the joints 4 and 5.
[0045]
Since cement milk (solidifying material) is supplied into the joint cases 11 and 12 that have been joined and hardened, the screws are not loosened after construction, and the tension between the segments 1A and 1B is maintained. The
[0046]
Since the male joint 11E and / or the female joint 21E are coupled to the tension support member (rebar 18) extending in the joining direction of the precast segment 1E via the coupling member 12E, it serves as a substitute for the stretched steel material. Further, the connecting members 12E are connected to the reinforcing bars 18, respectively, and the dispersibility of cracks is good.
[0047]
Alternatively, if the male joint 11D and / or the female joint is embedded and fixed in the anchor shape 11d in the precast segment 1D, if the strength of the concrete between the anchor 11d and the surface of the segment 1D is taken into consideration, the overhanging steel material, the drawing It is a substitute for steel for construction and steel for construction.
Although not shown, if the anchor type is to embed male bolts or female nuts in concrete and transmit the tensile force acting on the entire girder, the concrete between the anchor part and the segment joint surface A tensile force will be given in the form of a compressive force.
[0048]
Next, a second embodiment of the present invention will be described with reference to FIGS.
The second embodiment uses a joint of a different type from that used in the first embodiment.
[0049]
FIG. 13 shows a state in which the male joint 2 and the female joint 3 of the joint device used in the second embodiment are coupled. In addition, the arrow in a figure represents the operation | movement direction of each operation | movement part until coupling is completed.
[0050]
First, the configuration of the second embodiment will be described with reference to FIGS. 14 and 15. FIG. 15 is a view rotated 90 ° clockwise in the direction of the arrow with respect to FIG. 13 described above.
[0051]
In the first segment A, the male joint 2 is embedded with a joint surface common to the joint surface Aa of the segment A. The male joint 2 includes a shaft portion 2a, a storage chamber 2b, and an anchor portion 2c.
[0052]
In the storage chamber 2b, a joint bolt 6 for joining to the female joint 3 and a worm wheel 13A coaxial with the joint bolt 6 are housed.
The joint bolt 6 includes a shaft portion 6a, a hemispherical tip portion 6b at the outer end portion of the segment, a hexagonal head portion 6e at the inner end portion of the segment, and a screw formed on the hexagonal head portion 6e side. It is comprised with the part 6c. Further, the back surface 6 d of the hemispherical tip 6 b is a flat surface and forms a system stop surface with the female joint 3.
The storage chamber 2b has a hexagonal cross section slightly larger than the hexagonal head 6e of the joining bolt 6, and the joining bolt 6 can be freely moved in the axial direction in the storage chamber 2b having the hexagonal cross section. Has been.
[0053]
The screw portion 6c of the joining bolt 6 is screwed with a female screw portion (not shown) formed on the inner diameter portion of the worm wheel 13A, and the joining bolt 6 moves in the axial direction by the rotation of the worm wheel 13A.
The worm wheel 13A meshes with a worm gear 15A inserted from a worm gear insertion hole 15Aa formed in the storage chamber 2b of the male joint 2, and rotates by rotating the worm gear 15A.
[0054]
On the other hand, the female joint 3 is embedded in the second segment B with a joint surface common to the joint surface Ba of the segment B. The female joint 3 includes a shaft portion 3a, a joining bolt locking chamber 3b, and an anchor portion 3c.
One side of the joining bolt locking chamber 3b is opened completely, and a slit 3s having an opening is formed on the opened side. In addition, a segment-side depression Bb having a width that allows the spherical head 6b of the joining bolt 6 to be freely inserted is formed on the open side of the joining material locking chamber 3b of the second segment B. .
[0055]
Next, with reference to FIGS. 14 to 19, the joining process of the first and second segments A and B will be described.
[0056]
14 to 18 show positions where the male joint 2 fixed to one of the precast segments to be joined (first segment A) and the female joint 3 fixed to the other (second segment B) are aligned. After the mating step (FIG. 14) and the joint bolt 6 of the male joint 2 are inserted into the recess Bb on the second segment side (FIGS. 15 to 17), the joint bolt locking chamber 3b of the joint 3 is inserted through the slit 3s. FIG. 18 shows a bolt insertion process for sliding (FIG. 18).
That is, in FIG. 15 to FIG. 17, the joint bolt 6 of the male joint 2 is disposed at a position deviated from a position facing the joint bolt locking chamber 3 b of the female joint 3. The bolt 6 slides from the position offset from the center position of the shaft portion 3a of the female joint 3 to the center position of the shaft portion 3a of the female joint 3 through the slit 3s.
[0057]
19 and 20, by rotating the worm gear 15A, the worm wheel 13A is rotated, and the back surface 6d of the hemispherical tip 6b of the joining bolt 6 is pulled back to the male joint side, while the connecting member of the female joint 3 is used. It is locked to the locking wall 3d of the locking chamber 3b.
[0058]
In FIG. 21, the joining bolt 6 is pulled back to the male joint 2 side, the first segment A and the second segment B are firmly joined, and the fastening is completed.
[0059]
FIG. 22 is a diagram showing a state in which a solidifying material is supplied to the inside of the joined joint, and is substantially the same as the fastening completion state shown in FIG. is there.
[0060]
The second embodiment of FIGS. 13 to 22 has a structure in which the female side is locked to the distal end of the joint member on the male joint side, compared to the first embodiment of FIGS. The only difference is that the nut and the urging spring are eliminated, and the function of the joint and the fixing of the precast segment, the operational effect, and the like are the same as in the first embodiment, and detailed description thereof is omitted.
[0071]
It should be noted that the illustrated embodiment is merely an example, and is not a description to limit the technical scope of the present invention.
For example, in the illustrated embodiment, the joints on the joint surfaces of the segments are connected by a reinforcing bar, but the reinforcing bars may be covered with a sheath member.
Further, the coupling device can be applied to other than the illustrated one.
[0072]
【The invention's effect】
The present invention is configured as described above, and has the following effects.
(1) A “partial prestress design” is possible in which partial prestress is applied to a joining apparatus that uses a joint that is a part of precast, in which the “opening” of the joining surface is controlled.
Since “partial prestress design” is possible, the segment cross-section can be reduced and the capacity of PC steel can be reduced compared to “full prestress design” that applies prestress to the entire precast, thereby reducing costs.
(2) Also, by controlling the “opening”, the durability of the entire structure can be expected from the beginning of the design, which is useful for maintenance after completion.
(3) A conventional attracting steel material having a function for temporary use and a concrete protrusion for fixing the attracting steel material can be omitted, and the cost can be reduced.
(4) The joints can be freely arranged so that a uniform fastening force acts on the entire surface of the segment joint surface, and the entire segment can be balanced by applying a uniform joint surface compression force to the joint. Durable design can be taken.
Therefore, the use of members can be minimized.
(5) After joining, the joint acts as a structural member, and the presence of the structural member between the precast segments can improve the strength and reduce the “opening” between the precast segments. Further, even if an opening occurs, the “opening” can be closed by tightening the joints 4 and 5.
(6) Since the solidifying material is supplied to the inside of the joined joint and hardened, the screws are not loosened after the construction, and the tension between the segments is maintained.
(7) Since the male joint and / or the female joint are coupled to the tension support member that extends in the joining direction of the precast segment, it is a substitute for the overhanging steel material, the drawing steel material, and the permanent steel material. In addition, since the connecting members are connected to the reinforcing bars, a structure in which one reinforcing bar becomes a segment can be achieved, and the dispersibility of cracks is good.
(8) If a male joint and / or a female joint is embedded and fixed in an anchor shape in a precast segment, and considering the material and structure between the anchor and the surface of the segment, it will be a substitute for an overhang steel material.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an initial step in a first embodiment of the present invention.
FIG. 2 is a three-dimensional view showing in detail the joint portion of FIG. 1;
FIG. 3 is a sectional view showing a second step in the first embodiment of the present invention.
4 is a three-dimensional view showing in detail the joint portion of FIG. 3;
FIG. 5 is a cross-sectional view showing a third step in the first embodiment of the present invention.
6 is a three-dimensional view showing in detail the joint portion of FIG. 5;
FIG. 7 is a cross-sectional view showing a final process in the first embodiment of the present invention.
8 is a three-dimensional view showing in detail the joint portion of FIG. 7;
FIG. 9 is a cross-sectional view showing one mode of fixing the joint and the precast segment in the first embodiment of the present invention.
FIG. 10 is a cross-sectional view showing another aspect of fixing the joint and the precast segment in the first embodiment of the present invention.
FIG. 11 is a schematic view schematically showing the positional relationship between reinforcing bars and joints in the segments joined in the first embodiment of the present invention.
FIG. 12 is a cross-sectional view showing a manner in which a solidifying material is injected into the joint joined in the first embodiment of the present invention.
FIG. 13 is a perspective view showing a configuration and an operation direction of a second embodiment of the present invention.
FIG. 14 is a diagram showing a process of aligning both male and female joints in the second embodiment of the present invention.
FIG. 15 is a perspective view showing a state in which both male and female joints are arranged at offset positions after alignment.
FIG. 16 is a perspective view showing a process of inserting a male joint into the female joint side.
FIG. 17 is a plan view in which FIG. 16 is replaced with a plane.
FIG. 18 is a perspective view showing a process of sliding a male joint inserted into a female joint to a normal position to be joined.
FIG. 19 is a plan view showing a step of pulling the female joint by pulling the joining member of the male joint.
20 is a perspective view corresponding to FIG.
FIG. 21 is a plan view showing a state where joining is completed in the second embodiment of the present invention.
FIG. 22 is a cross-sectional view showing a state in which a solidifying material is injected into a joint in a state where joining is completed in the second embodiment of the present invention.
FIG. 23 is a cross-sectional view of a precast segment connecting device according to the prior art.
FIG. 24 is a front view of a precast segment connecting device according to the prior art.
FIG. 25 is a schematic diagram showing a conventional cantilever method.

Claims (2)

  A male joint is fixed to one of adjacent precast segments constituting the structure, and a female joint is fixed to the other. In the precast segment joining apparatus for joining the precast segments, the male joint (4) A male joint case (11) provided in the precast segment (1A), a joining bolt (12) provided in the male joint case (11), and a threaded portion (12a) of the joining bolt (12) A worm wheel (13) having a female thread portion of an inner diameter portion to be screwed, and the male joint case (11) is open to the joint surface (1a) side of one precast segment (1A), and the hole The joint bolt (12) is movably inserted in the axial direction in the portion (11a), and the precast segment of the male joint case (11) is inserted. An anchor (11c) is formed on the inner side of the joint, an incomplete thread portion (12b) is provided on the inner side of the precast segment of the joining bolt (12), and the worm wheel (13) is formed on a male joint. Is engaged with the worm gear (15) inserted through the worm gear insertion hole (15a). 21) a nut (22) that is inserted in the axial direction so as to be movable in the axial direction; and an elastic means (23) that presses the nut (22) toward the joint surface (1b) of the other precast segment (1B); An opening-side end surface (21d) against which the nut (22) abuts, and the female joint case (21) is connected to the other side of the precast segment (1B). 1b) the opening (21a), the welding device of precast segments, characterized in that the anchor (21c) is formed at the end of the precast segment (1B) inner side.   In a precast segment joining apparatus for joining a pre-joint segment in which a male joint is fixed to one of adjacent pre-cast segments constituting the structure and a female joint is fixed to the other, the male joint (2) is one Provided on the joint surface (Aa) side of the shaft portion (2a) provided on the precast segment (A), the anchor portion (2c) provided on the inner side of the segment of the shaft portion (2a), and the shaft portion (2a). And a storage bolt (6b) for joining the female joint (3) and a threaded portion (6c) of the joint bolt (6). The joint bolt (6) includes a shaft portion (6a), a tip end portion (6b) of the outer end portion of the segment, and a head portion (6b) of the segment inner end portion. 6 ), The screw portion (6c) is formed on the head (6e) side, and the back surface (6d) of the tip portion (6b) forms a locking surface with the female joint (3). The storage chamber (2b) has a cross section slightly larger than the head (6e), the joining bolt (6) is movable in the axial direction in the storage chamber (2b), and the storage chamber ( 2b) has a worm gear insertion hole (15Aa) for inserting a worm gear (15A) for rotating the worm wheel (13A), and the other segment (R) has a shaft portion (3a) and its shaft portion (3a). ) Embedded in a female joint (3) including an anchor portion (3c) provided on the segment inner side and a joining bolt locking chamber (3b) provided on the joining surface (Ba) side of the shaft portion (3a), The joint bolt locking chamber (3b) has an opening on the open side. To formed slit (3s) is, and the bonding apparatus of precast segments, characterized in that recesses can be inserted the head (6b) of the fastening bolt (6) (Bb) are formed.

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