JP4357375B2 - Load transfer reinforcement and load transfer reinforcement construction method - Google Patents

Description

  The present invention relates to a concrete joint such as a concrete standing structure such as a protective fence for vehicles on roads, various concrete pavements such as airports, roads and bridges, and other concrete structures exposed to an external environment. The present invention provides a load transmission reinforcement for reinforcing a portion and a method for constructing the load transmission reinforcement.

  In the concrete structure exposed to the external environment, the cast concrete expands due to an increase in temperature, or contracts due to initial drying shrinkage, a decrease in temperature, or the like. Therefore, in order to absorb such expansion and contraction, the concrete joints are configured with a predetermined interval. Since it is necessary to absorb the stress as described above at the joint, the normal structural reinforcing bars will be divided without being continuously extended, but no reinforcing bars are provided at the joint. In this case, the part was extremely weak and could not cope with a structure that could generate a large impact or load.

Therefore, a load transmission bar composed of round steel and a sheath tube, which transmits a load and can cope with expansion and contraction of a concrete structure is used.
A slip bar made of a long rod-like member in the load transmission muscle is inserted so as to be slidable inside the sheath tube. There is a risk that concrete mortar or water placed from the gap with the bar will enter the inside of the sheath tube, and the sheath tube will be clogged or rusted and the slip bar will not slide. In order to prevent this, the inside of the sheath tube is filled with a bitumen material or highly viscous grease in advance to prevent mortar and moisture from entering.

However, in the above bituminous material, a heating facility for fluidizing the material by heat treatment in order to pack the material in the sheath tube is a necessity, and it is difficult to pack the heated bitumen material in the sheath tube. Work has also occurred.
In addition, when using highly viscous grease, it is necessary to manually fill the grease, and quality is uneven, resulting in a defective product, often failing to perform its original function.
Furthermore, a method of closing the entire inlet portion with a sponge-like material is also considered, but in the case of closing the entire tube, a slip bar cannot be fitted and inserted in advance, and the concrete is placed after placing the sponge. It was necessary to remove the object or push it into the back of the sheath tube.
Japanese Patent Laid-Open No. 2001-182008

  As described above, bitumen materials and highly viscous grease are packed in the sheath tube of the conventional load transfer muscles in advance. It was happening. There is also the inconvenience that heating equipment is required. Furthermore, in the case of a closing member that closes the entire entrance portion, it has been necessary to perform some kind of treatment on the closing member after placing concrete.

The present invention solves the above-mentioned drawbacks, and includes a slip bar made of a long member of a round bar, a bottomed sheath tube capable of slidably moving almost half of the slip bar, and an inlet of the sheath tube. A seal ring having an inner diameter slightly smaller than the outer diameter of the slip bar and an outer diameter slightly larger than the inner diameter of the sheath tube can be sealed in the gap between the slip bar and the inner wall of the inlet portion of the sheath tube. It is characterized by a load transmission muscle that is mounted in a state .

Further, in the concrete beating joints of the concrete construction, almost half of the preceding slip end reinforcing bars before the construction of the concrete construction bar is fixed so as to be exposed outwardly to construct a concrete construction, a slip bar out the exposed in the construction methods of constructing the subsequent concrete construction in a state where the bottomed sleeve pipe insertion arrangement to set the slightly than the inner diameter of the slip bar inner and the sheath tube slightly smaller diameter than the outer diameter of the inlet portion of the sheath tube a sealing ring having an outer diameter of the large diameter is mounted, the gap between the inner wall of the slip bar and sheath pipe was closed fort by the sealing ring, exposed to the end reinforcing bars before construction of concrete constructs continue after the are the sheath pipe is fixed, to construct a subsequent concrete construction by pouring concrete while preventing the entry of such mortar and water from said inlet portion, and the slip bar Wherein the bottom sleeve pipe and construction methods of the load transmission muscles become more load transmission muscle formed by arranged so as to extend between both concrete construction.

Furthermore, in the concrete joint portion of the concrete structure, a concrete structure is constructed by fixing the bottomed sheath pipe in a position where the end-end reinforcing bar before construction of the preceding concrete construction is embedded, and a slip bar is placed in the sheath pipe. In a construction method for constructing a subsequent concrete structure in a state in which almost half of the sheath is inserted and disposed so as to be exposed to the outside, an inner diameter slightly smaller than the outer diameter of the slip bar and the sheath at the inlet of the sheath pipe a sealing ring having an outer diameter slightly larger diameter than the inner diameter of the tube is attached, by the sealing ring, the gap between the inner wall of the slip bar and sheath pipe and closed infarction, front edge of the construction of concrete constructs continue after the slip bar fixed exposed at parts rebar to build subsequent concrete construction by pouring concrete while preventing the entry of such mortar and water from said inlet portion Wherein the method of applying the load transmission muscles composed by arranging so as to extend more becomes the load transmitting muscle and the slip bar bottomed sleeve pipe between the two concrete construction.

  Moreover, the construction method of the load transmission reinforcement which used the said concrete structure as the guard fence for vehicles is characterized.

  The load transmission bar of the present invention can be easily installed without using special equipment or tools at the entrance of the sheath pipe at the construction site or factory, and the gap between the slip bar and the sheath pipe. Therefore, it is possible to prevent mortar, moisture, etc. from infiltrating from the part and prevent the inside of the sheath tube from being clogged or rusted.

  In addition, by fixing the load transmission bar to the jointed part of the concrete, it is possible to cope with expansion and contraction of the concrete, and at the same time, it is possible to transmit the load to each other, acting on the structure constructed with the concrete. Loads such as impact can be transmitted and dispersed, and it is possible to construct structurally effective structures.

  Further, by using the load transfer bar of the present invention, it is possible to place concrete with the slip bar fitted in the sheath tube, and it is possible to obtain a load transfer bar that is advantageous in the construction process. It was. As a result, it is possible to attach the load transmission bar to the reinforcing bar as a framework while pulling out the slip bar from the sheath pipe and checking the horizontal state, and it is possible to install it in the sheath pipe when placing concrete. It was.

  The present invention will be described below with reference to examples.

FIG. 1 shows a cross-sectional view of a load transfer bar 1 of the present invention.
The load transmission line 1 includes a slip bar 2, a sheath tube 3 into which the slip bar 2 is inserted and slidably movable, and a sealing ring 4 attached to an inlet portion of the sheath tube 3. Yes.

  The load transmission bar 1 is used for a concrete joint portion of a reinforced concrete structure. After the construction is completed, the load transmission bar 1 transmits various loads acting on the joint point to each other at the same time. It is intended to cope with expansion and contraction.

The slip bar 2 is in the form of a long bar such as round steel, and in this embodiment, a bar having a length of about 1000 mm and a bar diameter of 25 mm is used. A rust stopper 5 made of a paint or the like is formed at substantially the center.
The sheath tube 3 is tubular, and one end side is an inlet portion 6 into which the slip bar 2 is inserted, and the other end side is a bottomed portion 7 that is sealed with a lid. The sheath tube 3 having a length of about 520 mm and a tube diameter of 32 mm is used.

A sealing ring 4 is attached to the inner end of the inlet portion 6 of the pipe. By forming the outer diameter of the sealing ring 4 slightly larger than the inner diameter of the pipe, the sealing ring 4 can be fixedly attached to the portion. it can.
The sealing ring 4 is a rubber ring mainly composed of hard rubber or soft rubber, and is best used for sealing, but other synthetic resin type or water-expandable ring can be used. . What has elasticity so that it is easy to mount | wear to the pipe inner side edge part is good.

  It is also possible to previously form a ring-shaped shallow groove at the inner end of the inlet portion 6 of the sheath tube 3 and attach the sealing ring 4 to the shallow groove.

A slip bar 2 is inserted into the sheath tube 3 so as to have a predetermined space inside the bottomed portion 7 side which is the innermost part, and the slip ring 2 is connected to the sheath tube 3 by a sealing ring 4 attached to the inlet portion 6. The gap with the sheath tube 3 is closed, and the inlet 6 is sealed.
Therefore, even if an expansion / contraction action is applied to the load transmission muscle 1 having the above configuration, the expansion / contraction can be dealt with by the slip bar 2 in the sheath tube 3 moving. Further, mortar and moisture before concrete hardening does not enter the sheath tube 3 from the inlet portion 6 of the load transmission bar 1 disposed in the joint portion of the concrete structure, and the movement is not hindered. .

2 to 4 show an example in which the load transmission bar 1 of the present invention is used for a vehicle guard fence.
The vehicle protective fence 8 is a concrete structure constructed in a median strip such as an expressway, and has a height of about 800 mm to 1100 mm and a width of about 600 mm to 800 mm. Moreover, the primary concrete construction body 9 used as a foundation is constructed, the reinforcing bar 10 is erected from the primary concrete construction body 9, the assembly bar 11 is fixed to the reinforcing bar 10, and the assembly bar 11 is further attached. A protective fence 8 is constructed by placing concrete 12 as secondary material so as to surround it.

  The assembling bar 11 is formed in a mountain shape by the horizontal bar 13 and the vertical bar 14, and a concrete fence 12 is constructed around it to construct a guard fence for the vehicle. The joint 15 is formed.

The joint portion 15 is mainly provided to concentrate and absorb the expansion and contraction of the concrete 12 and the assembly bar 11, and forms a joint portion 16. The joints 16 serving as the joints 15 are intermittently connected without continuously connecting the reinforcing bars serving as a normal framework. However, there is a case where a large load such as a car collides with the location, and in this case, the joint 15 becomes a structurally weak location, and there is a possibility that it will be severely damaged.
In view of this, a load transmission line 1 capable of absorbing the expansion and contraction and effective in strength is disposed in the joint portion 15.

As shown in FIGS. 2 and 3, five load transmission bars 1 are provided in parallel to the horizontal bar 13 at the upper part in the joint 15 of the guard fence 8 for the vehicle.
The load transmission bar 1 is a concrete in which the slip bar 2 is fixed to the longitudinal bar 14 and / or the horizontal bar 13 at one end close to the joint 15 of the concrete, and almost half of the bar is exposed to the outside. 12 is placed. The sheath tube 3 may be attached either before or after placing concrete. Before the placement, the sheath 3 with the sealing ring 4 attached to the inlet 6 is inserted into the portion where the slip bar 2 is exposed. There is no penetration into the sheath tube. Since the part where the slip bar 2 is exposed from the concrete does not fit in the sheath tube 3 and a part of the slip bar 2 may be exposed or possibly formed in the center part of the slip bar 2, the rust stopper 5 is provided on the part. Apply in advance. When the concrete is placed, it is inserted into the slip bar 2 when the sheath tube 3 is fixed to the jointed frame.

A joint portion 16 shown in FIG. 4 is formed at the end of the preceding vehicle guard fence 8 constructed. As the joint part 16, a bitumen fibrous material having a thickness of about 20 mm is used.
The slip bar 2 is protruded through the joint 16 and the sheath tube 3 inserted into the exposed portion is fixed in the concrete of the vehicle guard fence 8 to be continuously constructed as described above. Become. Prior to placing the concrete, the sheath tube 3 is fixed to the longitudinal bar 18 and / or the horizontal bar 19 at the end of the joint portion of the next assembly bar 17.

After being fixed to the assembly bar 17, the concrete is cast and a new vehicular protective fence 8 is jointed to the previous construction.
After the concrete is hardened, the mortar is hardened so that it does not enter the sheath tube 3, moisture is prevented from entering by the sealing ring 4, and the slip bar 2 can slide in the sheath tube 3. Can act effectively.

By repeating the construction described above, a continuous vehicular protective fence 8 is completed.
When a vehicle or the like collides with the joint 15 or a position near the joint 15 and a large load is applied to the vehicle protective fence 8, the impact is caused by the load transmission line 1 disposed in the joint 15. It is transmitted to the 15 right and left vehicle protection fences 8, and the impact can be dispersed and absorbed.
In particular, as shown in FIG. 2, it is possible to disperse the load more effectively by arranging a load transmission line in the upper part of the vehicle guard fence 8.

In the second embodiment, the slip bar 2 is embedded and fixed in the concrete to be constructed in advance. On the contrary, the sheath bar 3 is embedded and fixed in the concrete to be constructed in advance, and then the exposed slip bar 2 is exposed. It is also possible to fix the side to the cast-in concrete side.
Furthermore, it is possible to alternately fix the attachment positions of the slip bar 2 and the sheath tube 3 at adjacent positions of the same concrete structure.

  In the said Example 2, 3, although demonstrated along the application to the guard fence for vehicles of a load transmission line, it cannot be overemphasized that it can use in the joint part of various other concrete structures.

Sectional drawing of the load transmission reinforcement of this invention. Sectional drawing of the transversal direction of the Example which used the load transmission line of this invention for the guard fence for vehicles. Sectional drawing of the longitudinal direction of the Example which used the load transmission line of this invention for the guard fence for vehicles. Sectional drawing which shows the joint part of a joint part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Load transmission reinforcement 2 Slip bar 3 Sheath pipe 4 Sealing ring 5 Rust prevention 6 Entrance part 7 Bottomed part 8 Vehicle guard fence 9 Primary concrete structure 10 Reinforcement 11, 17 Assembly reinforcement 12 Concrete 13, 19 Horizontal reinforcement 14, 18 Vertical Muscle 15 Joint 16 Joint

Claims (4)

A slip bar made of a long member of a round bar, a bottomed sheath tube capable of slidably moving almost half of the slip bar, and a slightly smaller diameter than the outer diameter of the slip bar at the inlet of the sheath tube And a sealing ring having an outer diameter that is slightly larger than the inner diameter of the sheath tube and the inner diameter of the sheath tube so as to seal the gap between the slip bar and the inner wall of the inlet portion of the sheath tube. Transmitter muscle. In concrete beating joints of the concrete construction, the preceding almost half to the end rebar slip bar before building concrete construct fixed and so as to be exposed outwardly to construct a concrete construction, Yes slip bar out the exposed in construction methods for constructing the subsequent concrete construction in a state of being inserted disposed a Sokosayakan slightly larger diameter than the inner diameter of the slip bar inner and the sheath tube slightly smaller diameter than the outer diameter of the inlet portion of the sheath tube sheath of mounting the sealing ring having an outer diameter, the gap between the inner wall of the slip bar and sheath pipe by the sealing ring and the closed infarction, are exposed at the end portion reinforcing bar prior to the construction of concrete constructs continue after the the tube was fixed, to construct a subsequent concrete construction by pouring concrete while preventing the entry of such mortar and moisture from the inlet portion, the slip bar and Yusokosaya When construction methods of the load transmission streaks characterized by being arranged so as to extend more becomes the load transmitting muscle between both concrete construction. In the concrete joint part of the concrete structure, the concrete structure is constructed by fixing the bottomed sheath pipe to the position where the end reinforcing bar before construction of the preceding concrete construction is embedded , and the slip bar is almost disposed in the sheath pipe. In the construction method of constructing a subsequent concrete structure in a state where the half is exposed and disposed so as to be exposed to the outside, an inner diameter slightly smaller than the outer diameter of the slip bar and an outer diameter of the sheath pipe at the inlet of the sheath pipe fitted with a sealing ring having an outer diameter slightly larger diameter than the inner diameter, the said sealing ring, the gap between the inner wall of the slip bar and sheath pipe and closed infarction, end reinforcing bars before construction of concrete constructs continue after the exposing the slip bar fixed and to build subsequent concrete construction by pouring concrete while preventing the entry of such mortar and water from the inlet portion, the scan Construction methods of the load transmission muscle, characterized in that the more becomes the load transmitting muscle and Ppuba bottomed sheath tube formed by arranged so as to extend between both concrete construction.   The method for constructing a load transfer bar according to claim 2 or 3, wherein the concrete structure is a protective fence for vehicles.

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