JPH11117233A - Precast concrete board connecting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the connecting method of a precast concrete board used for a bridge floor board, pavements and the like. SOLUTION: When adjoining precast concrete boards 1, 2 are to be connected to each other, a first arrangement hole 11 having its opening on the connecting end surface is provided in the interior of one of the precast concrete boards 1 with a reinforcement 3 stowed inside the first arrangement hole 1 and a second arrangement hole 21 having its opening on the connecting end surface is provided in the interior of the other precast concrete plate 21 with a communicating hole 22 communicating outward provided at good length in the inner part thereof and a cord stowed inside the second arrangement hole 21 so that the further end may protrude beyond the surface of the hole 21. When the precast concrete plate 2 is to be laid so that the first and the second arrangement holes 11, 21 may face each other, the end of the cord 4 is fastened to the end of the reinforcement 3 by means of a fastening means provided on the reinforcement 3 or the core 4 or both, after which the reinforcement 3 is pulled and moved to position it inside the first and the second arrangement holes 11, 21 by pulling the code 4 from the communicating hole 22 side and the reinforcement 3 is fixed inside both precast concrete boards concrete 1, 2 by filling the first and the second arrangement holes 11, 21 with a filler.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for joining a precast concrete slab used for a floor slab or a pavement of a bridge.

[0002]

2. Description of the Related Art Replacement of slabs of deteriorated steel bridges, roads,
Since it can be constructed on an apron pavement or a parking lot at an airport in a short construction period, the demand for a covering work using a precast concrete slab is increasing. In particular, with regard to pavement, taking advantage of the fact that replacement can be performed relatively easily, the number of cases where precast concrete slabs are constructed from the time of new construction has increased. When laying precast concrete slabs to make paving slabs, there is a problem in the joint treatment between the concrete slabs. Various joining methods have been proposed. In particular, in the joining method proposed in Japanese Patent Application Laid-Open No. 8-128006, a reinforcing bar is provided in a storage hole formed in a precast concrete slab, and a supply hole extending from the back end of the storage hole to the surface is formed. By supplying a fluid such as air, grout liquid, mortar or the like at a high pressure through this supply hole, the reinforcing bar is propelled, and the reinforcing bar is arranged so as to extend over the adjacent precast concrete slab. It has the advantage that it can be joined without using it.

[0003]

However, in the conventional joining method described above, the fluid has to be supplied from the supply hole at a high pressure in order to propel (move) the reinforcing bar with the fluid. At that time, since the rebar has a frictional force between the weight of the rebar itself and the inner wall of the hole, a special compressed air supply device is required particularly when air having a low specific gravity is used. In addition, when using a grout solution or mortar, there is an advantage that the grout solution or mortar can be filled as it is without being recovered, but since it must be supplied at a high pressure, the grout solution or mortar flows backward through the supply holes, and joints, etc. , It was necessary to prepare a grout solution or mortar in excess of the filling amount. Of course, there is also a problem that the propulsion cannot be reliably performed unless a relatively lightweight reinforcing bar is used. In addition, the grouting liquid or mortar flowing backward from the vertical hole or jumping out of the joints stains the surface of the precast concrete slab, so that a recovery facility and a cleaning operation are required. Further, in order to confirm whether or not the reinforcing bar has been propelled, it is necessary to take a method of appropriately opening a vertical hole or the like and removing it from the surface. Therefore, the present inventors have studied a method capable of quickly and reliably performing a joining operation without causing the above-described problem.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and has been proposed in connection with joining of adjacent precast concrete slabs. In the first installation hole, a reinforcing bar is housed, and a second installation hole is provided in the other precast concrete slab, the opening being open to the joint end face. A communication hole extending to the second arrangement hole is extended, and the cord material is stored in the second arrangement hole such that the back end protrudes from the surface, and the first arrangement hole and the second arrangement hole face each other. When the precast concrete slab is laid as described above, the leading end of the reinforcing bar and the leading end of the cord are locked by the locking means provided on one or both of the reinforcing bar and the cord, and then the cord is pulled from the communication hole side. To pull and move the rebar, and put the rebar first Precast concrete characterized by being located in the installation hole and the second installation hole, further filling the first installation hole and the second installation hole with a filler, and fixing the reinforcing steel to both precast concrete plates. It relates to a method of joining plates.

[0005]

According to the method for joining precast concrete slabs of the present invention, a reinforcing bar is built in one precast concrete slab in advance, and a string material is built in the other precast concrete slab such that the back end projects from the surface. Keep it. Next, when laying the precast concrete slab adjacent to each other so that the arrangement holes are opposed to each other, the leading end of the reinforcing bar and the leading end of the cord are engaged by locking means provided on one or both of the reinforcing bar and the cord. To stop. Thereafter, the rebar is pulled (moved) by pulling the string material, and is arranged so as to cover both the precast concrete slabs. When the rebar moves and comes into contact with the rear end of the second arrangement hole, a large resistance is generated in the cord material. That is, when a large resistance is generated, it is confirmed that the rebar has been moved and has been completed. When the filler is filled in the arrangement hole in this state, the reinforcing bar is fixed at that position, and both precast concrete slabs are joined. Therefore, the method for joining precast concrete slabs of the present invention does not require the use of nuts, couplers, etc., and does not require special equipment for supplying a fluid at a high pressure as in the aforementioned conventional joining method, It can be easily and reliably joined.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The precast concrete slab used in the present invention has a first arrangement hole, a second arrangement hole,
Although the communication hole is formed, the specific structure (hole diameter, hole length, shape, and the like) and other structures are not particularly limited, and any structure may be used. It is preferable to provide a small-diameter hole for filling the filler on the surface.

Further, as the reinforcing bar, for example, a commercially available deformed steel bar can be used, but it is not limited to this. The dimensions of the reinforcing bar can be determined by design as appropriate according to the scale of the precast concrete slab, etc., but usually, the diameter is about 20 to 38 mm and the length is 500 to
It may be about 1000 mm.

The string material is not particularly limited in its material and structure as long as it has a tensile (breaking) strength capable of pulling the rebar, and any material can be used. In addition, the length dimension of the cord material can be appropriately determined by design according to the length of the second arrangement hole and the communication hole.

Further, the locking means provided on both or one of the reinforcing bar and the string member can be easily locked when the other precast concrete slab is laid, and has a locking strength capable of pulling the reinforcing bar. Anything can be used. For example, a magnet may be attached to the tip of the cord material and locked with the reinforcing bar by magnetic force, or hooks may be provided at the tip of the cord material and the tip of the reinforcing bar, and the hooks may be locked with each other. It is good.

[0010] In the present invention, as described above, the cord is pulled until the large resistance is generated, and the rebar is pulled (moved).
Then, the reinforcing bar is positioned over the first and second arrangement holes, and then the cord may be dropped (collected and abandoned) into the communication hole together with the locking means. Alternatively, even after a large resistance is generated (the reinforcing bar abuts on the back end of the second arrangement hole), the string material may be continuously pulled and collected until the string material itself or the locking means is broken. Further, in the method of attaching a magnet to the tip of the string material, when the tensile (breaking) strength of the string material is set larger than the locking strength between the magnet and the reinforcing bar, the string material is pulled even after the large resistance is generated. Thus, the locked state is forcibly released, and the string material can be collected intact with the magnet at the tip, and can be reused. Furthermore, also in the method of providing hooks at the tip of the cord and the tip of the reinforcing bar, when the tensile strength of the cord and the strength of the hook at the tip of the cord are made larger than the strength of the hook at the tip of the reinforcing bar, the large If the string material is pulled even after the resistance is generated, the locked state is forcibly released, and the string material can be collected intact together with the hook at the tip, and can be reused.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in the drawings. In one embodiment of the present invention shown in FIG. 1, one precast concrete slab 1 located on the right side of the drawing is provided with a first arrangement hole 11 which is opened at the joint end face and accommodates the reinforcing bar 3, and is located on the left side of the drawing. In the other precast concrete slab 2 to be formed, a second arrangement hole 21 opening to the joint end face was formed. In addition, a communication hole 22 that extends to the surface is provided at the back end of the second arrangement hole 21. Each of the first arrangement hole 11 and the second arrangement hole 21 is a straight hole having a circular inner wall cross section, and the first arrangement hole 11 is slightly longer than the reinforcing bar 3. About 2
It had a double length. The communication hole 22 is a hole whose inner wall cross section is circular and bent in an arc shape. Further, a supply hole 12 communicating with the surface was formed at a deep end of the first arrangement hole 11. In addition, it is desirable that the first arrangement hole 11 and the second arrangement hole 21 facilitate smooth movement of the rebar 3 by smoothing the inner wall surface.

[0012] Precast concrete slabs 1 and 2 are prepared as described above, and prior to the laying work,
As shown in FIG. 1 (a), the reinforcing bar 3 is housed in the first arrangement hole 11, and the string material 4 with the magnet 5 attached to the tip is placed in the second arrangement hole 21. It is stored so as to protrude from the (communication hole 12). The locking strength between the magnet 5 and the reinforcing bar 3 and the tensile (breaking) strength of the cord 4 were larger than the moving resistance of the reinforcing bar 3 (the frictional resistance between the reinforcing bar 3 and the arrangement holes 11 and 21). The above operation may be performed before transporting the precast concrete slabs 1 and 2 to the site,
After transporting the precast concrete slabs 1 and 2 to the site, it may be performed before laying.

As shown in FIG. 2, an outflow preventing material 6 having a sealing effect is provided around the first arrangement hole 11 on the joint end face of the precast concrete slab 1.
The outflow prevention member 6 may be provided around the second arrangement hole 21 in the joint end face of the other precast concrete plate 2, or may be provided in both of them. When the agent is injected, the supply hole 12 and the communication hole 2
2. It prevents the filler from flowing out of the arrangement holes 11 and 21. Although not shown, a backup material may be interposed between the joining end faces to prevent the filler or the like from leaking from the joints (between the joining end faces).

Next, the other precast concrete slab 2 is laid so that the second installation hole 21 faces the first installation hole 11 of the one precast concrete slab 1. At that time, at the tip of the reinforcing bar 3 housed in the first arrangement hole 11,
The magnet 5 at the tip of the string material 4 housed in the second arrangement hole 21 is locked.

In this state, when the string 4 is pulled, the string 4
Pulls the rebar 3 and moves the rebar 3 in the direction of the second disposition hole 21, and in the illustrated embodiment, the tip is in contact with the deep end of the second disposition hole 21 as shown in FIG. become. That is, the reinforcing bar 3
Are arranged so as to extend within the first arrangement hole 11 and the second arrangement hole 21. In addition, since the rebar 3 does not advance any more, a large resistance is generated in the string material 4.

In the embodiment shown in FIG. 1B, the string material 4 is further pulled. Strength of the used string material 4 and magnet 5
Is made stronger than the locking strength between the magnet 5 and the reinforcing bar 3. In this case, the magnet 5 is forcibly separated from the tip of the reinforcing bar 3, and the string 4 is pulled out with the magnet 5 at the tip without damage. (Recovery). Then, the string material 4 and the magnet 5 can be reused repeatedly at another location.

Thereafter, a filler is injected from the supply hole 12. At the time of injection, there is no need to perform injection at a particularly high pressure. The injected filler fills the gap between the reinforcing bar 3 and the first arrangement hole 11 and the gap between the reinforcing bar 3 and the second arrangement hole 21, and the reinforcing bar 3 is fixed at that position. Of course, the filler
The supply holes 12 and the communication holes 22 are also filled. Incidentally, in order to strengthen the fixing of the reinforcing bar, a filler having a slight expansion performance at the time of curing may be used. In this way, the reinforcing bar 3 is fixed at a position in the first installation hole 11 and the second installation hole 21, and both the precast concrete plates 1 and 2 are joined.

As shown in FIG. 3, the precast concrete slabs 1 and 2 are arranged such that a first arrangement hole 11 is formed at one end and a second arrangement hole 21 is formed at the other end. May be. In this case, three reinforcing bar arrangement portions are provided at one end edge. However, as described above, the reinforcing bars 3 are respectively inserted into the first arrangement holes 11 and the second arrangement holes 21 are provided in advance.
When the laying is performed in a state in which the string members 4 each having the magnet 5 attached to the end thereof are stored, the reinforcing bars 3 are arranged in both the precast concrete plates 1 and 2 simply by pulling the string members 4 one after another from the surface. Can be set up.

The configuration of the precast concrete slab is not limited to the above, and the precast concrete slab having the first installation holes 11 formed at both ends and the second installation holes 21 formed at both ends. The precast concrete slabs may be alternately arranged adjacent to each other. However, in terms of productivity, a configuration in which the first arrangement hole 11 is formed at one end and the second arrangement hole 21 is formed at the other end as described above is excellent. Also, the joining method of the present invention may be applied to the joining between the side ends in the length direction. In the drawings, reference numeral 14 denotes a height adjusting bolt, and reference numeral 15 denotes a grout hole for connection.

FIG. 4 shows another example of the locking means between the cord 4 and the reinforcing bar 3 according to the present invention. Hooks 8 and 7 are provided at the tip of the cord 4 and the tip of the reinforcing bar 3, respectively. The hooks 8 and 7 are locked together to form locking means.
The hooking strength between the hooks 8 and 7 and the tensile (breaking) strength of the cord 4 are determined by the movement resistance of the reinforcing bar 3 (the reinforcing bar 3 and the arrangement holes 11 and
21). Therefore, when the string 4 is pulled in a state where the hooks 8 and 7 are locked with each other, the string 4 pulls the reinforcing bar 3, and the reinforcing bar 3 moves toward the second arrangement hole 21. In the illustrated embodiment shown in FIG. 4 (b), as shown in FIG. 1 (b), even after the reinforcing bar 3 comes into contact with the inner end of the second arrangement hole 21 and a large resistance is generated, the string material 4 is not removed. This shows a pulled state. The strength of the hook 8 on the side of the used string 4 and the tensile (breaking) strength of the string 4
Since the hooking strength of the reinforcements 7 (strength of the hooks 7 on the reinforcing bar 3 side) is made larger, the hooks 7 on the reinforcing bar 3 side are forcibly deformed, and the string material 4 is pulled out together with the hook 8 at the tip without damage. (Recovery). And this string material 4
The hook 8 can be reused repeatedly at another place.

On the other hand, FIG. 5 shows that, similarly to FIG. 4 described above, the locking strength between the hooks 8 and 7 and the tensile (breaking) strength of the cord 4 show the movement resistance of the reinforcing bar 3 (the reinforcing bar 3 and the arrangement holes 11 and 21). However, since the hooking strength between the hooks 8 and 7 used is made larger than the tensile (breaking) strength of the cord 4, the reinforcing bar 3 is connected to the second mounting hole 21 as shown in FIG. When the string material 4 is pulled even after a great resistance is generated by contacting the back end, the string material 4 is forcibly broken as shown in FIG. 5B.

Although the present invention has been described based on the embodiments, the present invention is not limited to the above-described embodiments, and may be implemented in any manner unless the configuration described in the claims is changed. Can be.

[0023]

As described above, the method for joining precast concrete slabs of the present invention does not require nuts and couplers as in the conventional method, and requires special equipment for supplying a fluid at high pressure. Therefore, the joining operation can be easily and reliably performed.

[Brief description of the drawings]

FIG. 1 shows one embodiment of a method for joining precast concrete slabs of the present invention, in which (a) a side cross-sectional view showing a situation where a cord material is pulled to pull and move a reinforcing bar, and (b) a reinforcing bar is locked. It is a sectional side view which shows the situation which pulls a string material and forcibly cancels a locked state after that.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a plan view showing an example of a precast concrete slab used in the present invention.

FIGS. 4A and 4B show another example of the locking means between the string material and the reinforcing bar according to the present invention, and FIG. 4A is a side view showing a state in which the string material is pulled to pull and move the reinforcing bar, and FIG. It is a side view which shows the situation which pulls a string material and forcibly releases a locked state even after it is performed.

FIG. 5 is a side view showing another example of the means for locking the cord and the reinforcing bar according to the present invention, wherein (a) a side view showing the situation where the cord is pulled to pull and move the reinforcing bar, and (b) the reinforcing bar is locked. It is a side view which shows the situation which pulls a string material and breaks a string material forcibly after it was performed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Precast concrete slab 11 First installation hole 12 Supply hole 2 Precast concrete slab 21 Second installation hole 22 Communication hole 3 Reinforcing bar 4 String material 5 Magnet 6 Outflow prevention material 7 Hook (for reinforcing bar) 8 (for reinforcing bar) )hook

Claims (5)

[Claims] At the time of joining adjacent precast concrete slabs, a first arranging hole is formed in one of the precast concrete slabs, the first arranging hole being opened at a joint end face, and a reinforcing bar is housed in the first arranging hole. At the same time, a second installation hole is provided in the other precast concrete slab that opens to the joint end face, and a communication hole that extends to the surface is extended at the back end of the second installation hole. In order to lay the precast concrete slab so that the back end protrudes from the surface at the back end, and when laying the precast concrete slab so that the first arrangement hole and the second arrangement hole are opposed, either After the tip of the rebar and the tip of the cord are locked by the locking means provided on one or both sides, the rebar is pulled and moved by pulling the cord from the communication hole side, and the rebar is placed in the first installation hole. And the second arrangement hole, and further, the first arrangement hole And a method of joining precast concrete plates, characterized in that a filler is filled in the second arrangement hole and the reinforcing steel is fixed to both precast concrete plates. 2. The method for joining precast concrete plates according to claim 1, wherein a magnet is attached to the tip of the string material and locked with a reinforcing bar by magnetic force to form locking means. 3. The method for joining precast concrete plates according to claim 1, wherein a hook is provided at each of a tip of the string material and a tip of the reinforcing bar, and the hooks are locked to each other to form locking means. 4. The precast concrete according to claim 2, wherein after the rebar is moved, the cord is further pulled to release the locked state between the magnet and the rebar and the cord is collected. Plate joining method. 5. The method according to claim 3, wherein after the rebar is moved, the cord is further pulled to break the hook on the rebar side to release the locked state, and to collect the cord. Method of precast concrete slab.