JP5814400B2 - Construction method of precast concrete construction structure and construction method of bulkhead structure of cage hoistway of middle-rise building elevator - Google Patents

Description

  The present invention relates to a building structure of precast concrete (hereinafter referred to as a precon) that can be formed safely and inexpensively, a method for constructing the building structure, and a partition wall of a cab hoistway of an elevator for a middle-rise building The present invention relates to a structure and a method for constructing the partition structure.

  In general, for concrete structures, RC concrete structures constructed by assembling concrete forms at the construction site and placing concrete in the formwork, and precast members pre-constructed with concrete, are transported to the construction site. In addition, there is a concrete structure having a precon structure in which precast members are assembled and constructed at a construction site.

  As the concrete structure of the precon structure, a plurality of blocks formed in a substantially U-shaped plane are opened toward the corridor or stairs and stacked on the foundation to form a cage hoistway, and the lower end in the foundation. Insert the high-tension shaft core with the embedded part into the stacked vertical communication hole, pull at least the upper end of the high-tension shaft core at the top of the block, and move the top layer block downward A partition structure for a car hoistway of an elevator for a middle-rise building that integrates each block by tightening the stacked blocks by pressing to each other and a construction method thereof (Patent Literature) 1).

  In a concrete structure with a precon structure constructed by stacking such blocks, a high-tensile shaft core such as PC steel is continuously inserted into each block, and pulled from the top to press each block downward. In general, the blocks are integrated by applying stress to each block in advance to improve the strength.

Japanese Patent Laid-Open No. 2000-185884

  However, in the pre-con such as the technique described in Patent Document 1, the stacked block itself becomes excessive strength and cracks occur in the concrete block because the stacked blocks are tightened by pulling the high tension shaft core. There was a problem that cracks increased due to freezing and thawing of rainwater and the like, leading to water leakage.

  Also, in this technology, when pulling a high tension shaft core, the shaft core is accidentally cut or the fixed portion of the shaft core is detached, etc., and an operator touches the high tension shaft core. There was a problem that a serious accident might occur, such as injury.

  Moreover, in the said technique, the concrete formwork for exclusive use for forming the said block was used for the block containing a concrete bridge part, but a concrete formwork is assembled only in order to form the said block. Had the problem of increasing the cost of building blocks.

  On the other hand, as in the invention described in the document, conventionally, in the construction of a precon, it has been usual to improve the strength of a concrete structure by adding stress due to the shaft core in advance. There are no examples of building a stress-free system, and there may be a problem in strength, so there was no idea of building a precon by stress-free.

Therefore, the present invention provides a construction method of a precast concrete construction structure and a construction method of a bulkhead structure of a cab hoistway of a middle-rise building elevator that can be formed more safely and inexpensively than before. That was the issue.

In order to solve the above problems, the present invention is configured as follows. That is, in the construction method of the precast concrete construction structure according to claim 1 according to the present invention, a plurality of vertical communication holes and a first step of standing by embedding the lower end of the shaft core on the foundation are formed. A second step in which the first precast member is inserted on the communication hole so that the tip of the shaft core is exposed and installed on the foundation; a connecting member is attached to the tip of the shaft core; and another shaft core A third step of connecting and extending, and another precast member in which a plurality of vertical communication holes are formed are inserted so that the end of the extended shaft core is exposed in the communication hole. A fourth step of installing a precast concrete construction structure by repeating the second step to the fourth step, and changing the length of the connecting and extending shaft core to deform the construction structure Depending on Resisting force axis tensile, and the this and features was set to a length capable of imparting a stress on the construct structures.

According to a second aspect of the present invention , there is provided a method for constructing a bulkhead structure for a cab hoistway of a middle-rise building elevator, wherein A method for constructing a bulkhead structure for a car hoistway, a first step in which the lower end of the shaft core is embedded on a foundation and a precast in which a plurality of vertical communication holes are formed in a substantially U shape in a planar shape A second step of installing the first block as a member on the foundation by allowing the first block to open toward the corridor or the staircase and to be inserted through the communication hole so that the tip of the shaft core is exposed; A third step of attaching a connecting member to the tip of the shaft core and further connecting and extending another shaft core, and a second block as a precast member in which a plurality of communication holes are formed in the vertical direction in a substantially rectangular shape in plan view The And a fourth step of installing on the first block inserted through so as axial tip that the stretching in the hole is exposed,
After the second block is installed, the other first block is installed on the second block, and the second to fourth steps are repeated to construct a partition structure for the car room hoistway, The length of the connected and extended shaft core is such that the shaft core can resist tensile force according to the deformation of the partition wall structure and can apply stress to the partition wall structure. It is characterized in that the.

Moreover, the construction method of the partition structure of the cab hoistway of the middle-rise building elevator according to claim 3 is the first block as the plane-shaped substantially U-shaped precast member in the construction method of claim 2. Cutting the opposing surface in the vicinity of the center in the vertical direction, or cutting the second block as the plane-shaped substantially square-shaped precast member in the vicinity of the center in the vertical direction to form the bridge portion, and And a step of installing the bridging portion on the middle-layer building side of the partition wall structure of the car room hoistway .

According to the invention described in claim 1 according to the present invention, the high-strength shaft core that is stacked and continuously inserted through the precast members is not pulled and fixed. Since the block does not break due to the shaft core and the opportunity for construction work such as renovation is reduced, it is possible to easily and efficiently construct a precast concrete construction structure capable of reducing maintenance costs.

  In addition, as described above, since the high-strength shaft core is not pulled and fixed, when the shaft core is continuously inserted into the precast member, the shaft core is accidentally cut or the fixed portion of the shaft core is detached. The worker can safely perform the construction work without causing any injury or the like by the worker coming into contact with the high-tension shaft core. Further, since no excessive pressure is applied to the shaft core, it is difficult to break, and the shaft core can be used for a long time, and the maintenance cost can be reduced.

  Furthermore, although tension work for applying stress without pulling the shaft core upward is unnecessary, when a precon building structure in which a plurality of precast members are stacked due to some shaking is deformed, Since the shaft core is pulled with it, it is possible to apply stress to the building structure, and it is possible to maintain an appropriate strength as the building structure of the precon. In addition, the building structure was certified by the Japan Building Research Institute as “Performance under long-term loading, damage controllability under short-term loading, and collapse / collapse in extremely rare earthquakes” No results have been obtained (GBRC Performance Certification No. 13-24) (February 18, 2014).

Further, according to the invention described in claim 2 , it is possible to obtain the same effect as that of the invention described in claim 1, and it is safe without damaging the first block and the second block. And a partition structure can be constructed | assembled cheaply. The bulkhead structure is intended for retrofitting elevators to schools, libraries, or mid-rise buildings such as mid-rise apartments, and is safe for public facilities such as schools and mid-rise apartments in residential areas. In addition, the partition wall structure can be easily and efficiently constructed by retrofitting at a low cost.

Further, according to the invention described in claim 3, it is possible to reduce the manufacturing cost of the bridging portion because it can be created by cutting the first block and a second block wherein the bridging portion is not stack it can.

It is a perspective view which shows the structure of the partition structure concerning this invention. It is an expanded sectional view showing the joined part which accumulated each block. It is a perspective view which shows a general purpose concrete formwork. It is a perspective view which shows a mode that a bridge part is manufactured. It is side surface sectional drawing which shows the state which installed the partition structure in the middle-rise building. It is side surface sectional drawing which shows the state which installed the partition structure in the middle-rise building. It is a perspective view which shows the state which installed the partition structure in the middle-rise building. It is a figure which shows the construction process of a partition structure. It is a figure which shows the construction process of a partition structure. It is a figure which shows the construction process of a partition structure. It is a figure which shows the construction process of a partition structure. It is a figure which shows the construction process of a partition structure.

  Hereinafter, the present invention will be specifically described with reference to the drawings. First, FIG. 1 is a perspective view showing a configuration of a partition structure 1 according to the present invention. A bulkhead structure 1 as a precon building structure is formed by alternately stacking a plurality of first blocks 2 having a substantially U-shaped planar shape and second blocks 3 having a substantially rectangular shape as a precast member. A bridge 4 is provided on the opening side of the substantially U-shaped first block 2 at the upper end of the door to connect to a corridor or a staircase of a middle-rise apartment or a middle-rise building such as a school. A roof slab 5 is fixed to the upper end of the uppermost second block 3, and the lower end of the lowermost first block 2 is fixed on the foundation 6. The opening side of the substantially U-shaped first block 2 is an elevator entrance.

  The first block 2 and the second block 3 are each formed with a plurality of vertical communication holes 7, and the shaft core 8 is inserted into the communication holes 7 that are stacked and continuous. The shaft core 8 is formed by connecting a plurality of connecting reinforcing bars via a coupler 8a as a connecting member. As shown in FIG. 2, the coupler 8a is housed in a diameter-expanded portion 7a formed in the lower portion of the communication hole 7, whereby the first block 2 in which the PC steel bars as the shaft core 8 are stacked from the foundation. And it can penetrate to the uppermost part of the communicating hole 7 of the 2nd block 3. FIG. At this time, the shaft core 8 is merely inserted through the communication hole 7, and the upper end of the shaft core 8 is simply fixed to the roof slab 5 without being pulled upward.

The length of the shaft core 8 connected by the coupler 8a is such that the shaft core resists tensile force according to the deformation of the partition structure 1 in which the first block 2 and the second block 3 are stacked and integrated. By
The partition wall structure 1 is formed with a length that can apply stress. As described above, in the present invention, the tension work for applying the stress by pulling the shaft core 8 upward is unnecessary, but the partition structure 1 in which the first block 2 and the second block 3 are stacked by some shaking. When the shaft is deformed, the shaft core 8 is pulled along with the deformation, so that stress can be applied to the partition wall structure 1 and an appropriate strength can be maintained as a precon building structure.

  Further, the first block 2 and the second block 3 are bonded and stacked by applying an adhesive to each upper end and each lower end, respectively, and a hard rubber packing or the like laid on each bonding surface (not shown). Then, the gap between the communicating holes 7 is filled with waterproof mortar (cement grout agent) and fixed.

  Here, the first block 2 and the second block 3 are formed into a substantially U-shape and a U-shape, respectively, using a general-purpose concrete form for constructing a tunnel-like concrete structure. In a present Example, the 1st block 2 and the 2nd block 3 are manufactured using the concrete formwork used when manufacturing the box culvert A (shown in FIG. 3) as the said general purpose concrete formwork.

  The box culvert A has been standardized according to various applications such as a sewage box culvert, a road earthwork box culvert, a bridge box culvert, and a waterway box culvert. The box culvert A of the size is standardized. The box culvert standardized in this way is manufactured using a concrete formwork that is generalized for each of the various standards. Therefore, if the 1st block 2 and the 2nd block 3 are manufactured using the said concrete formwork, it can manufacture cheaply compared with assembling and manufacturing exclusive concrete formwork, such as this 1st block 2. It is possible to reduce the construction cost of the partition wall structure 1.

  For example, as a standardized box culvert A, the inner dimension is 1800 mm, the inner dimension is 1800 mm, the outer dimension is 21000 mm, the outer dimension is 2100 mm, the height is 400 mm and the first block 2 or the second block 3 has the inner dimension. Manufactured using general-purpose concrete formwork according to various sizes such as 2500 mm, inner dimension 3000 mm, outer dimension 2900 mm, outer dimension 3500 mm and first block 2 or second block 3 having a height of 2000 mm. be able to.

  As shown in FIG. 4, the bridging portion 4 is formed by cutting the first block 2 having a substantially U-shaped planar shape near the center in the vertical direction. The first block 2 is not stacked to construct the partition structure 1 as described above, but is manufactured in the same manner as the first block 2 to be stacked. However, the first block 2 is used to form the bridge portion 4. is there. In addition, although not shown, the bridging portion 4 can be formed by cutting the second block 2 having a substantially rectangular shape in plan view in the vicinity of the center in the vertical direction. In addition, the said bridge part 4 is cut | disconnected by the length according to the space | interval width of the partition structure 1 and a middle-rise building.

  Thereby, it is not necessary to use a dedicated concrete formwork for manufacturing the bridging part 4, and since it can be manufactured by cutting the first block 2 or the second block 3, its manufacture Cost can be reduced.

  Next, the state which installed the said partition structure 1 in the vicinity of the middle-rise building is demonstrated.

  FIG. 5 is a sectional side view showing the partition structure 1. As described above, the partition structure 1 as a pre-construction building structure is built by stacking the first block 2 and the second block 3 as precast members in addition to the middle-rise building, and the partition structure 1 is installed on each floor. Connected to the corridor 9 of the middle-rise building through the bridge 4 of each. Although not shown, a handrail is usually installed in the corridor 9, but when connecting the bridge portion 4, the handrail is removed and falling on both sides of the bridge portion 4 is prevented. It is recommended to provide a handrail for use.

  FIG. 6 is also a sectional side view showing the partition structure 1. As described above, the partition wall structure 1 is constructed alongside the middle-rise building, and the partition wall structure 1 is connected to the landing 11 of the folding staircase 10 provided in the middle-layer building via each bridge portion 4. In this way, even if the bulkhead structure 1 cannot be provided on the side of the corridor 9 of the middle-rise building due to various circumstances, the landing area 11 of the turn-up stairs 10 of the middle-rise building is connected via the bridge portion 4. The partition structure 1 can be connected. In this case, it is necessary to go up and down the half stairs 10 from the landing 11 to each room. In addition, as shown in FIG. 6, when the partition wall structure 1 is installed on the folding staircase 10 or when the first floor corridor of the middle-rise building is slightly higher than the ground surface, the height adjustment is performed on the upper end of the foundation 6. The second block 3 can be stacked. In addition, when connecting the bridge part 4, it is good to provide the handrail for fall prevention on both sides of the bridge part 4. FIG.

FIG. 7 is an external perspective view showing a state in which the partition wall structure 1 is installed in a middle-rise building. The partition wall structure 1 installed in this way can improve the worker's safety in addition to the effect of improving the work efficiency by the worker and reducing the noise damage to the local residents by shortening the work process. In addition, the operation cost can be reduced by reducing the maintenance cost and the like, which is economically superior.

  Next, the process of constructing the partition structure 1 according to the present invention, here, the process of constructing the partition structure 1 in a four-story middle-rise building will be specifically described with reference to FIGS. 8 to 12. .

  First, by using the general-purpose concrete formwork, the first block 2 in which a plurality of vertical communication holes 7 are formed in a substantially U shape in a planar shape, and a plurality of communication holes 7 are formed in a vertical shape in a substantially rectangular shape. The formed second block 3 is formed as a precast member. The formation of the first block 2 and the second block 3 is formed in another work place or the like, and then transported to the middle-rise building where these are installed.

  Next, as shown in FIG. 8, the foundation 6 is constructed at a predetermined position in the vicinity of the middle-rise building, that is, in the vicinity of the corridor 9 or in the vicinity of the folded stairs 10. A plurality of shaft cores 8 are embedded in the foundation 6 in a state of protruding from the top end of the foundation 6 with a width of about 95 mm to 105 mm, and other shaft cores 8 are embedded at the tip of the shaft core 8. A coupler 8a for connecting is attached.

Next, as shown in FIG. 9, another shaft core 8 is attached above the coupler 8a attached to the tip portion of the shaft core 8 embedded in the foundation 6 and extended in the vertical direction.

  Next, as shown in FIG. 10, the first block 2 is lifted using a crane and stacked on top of the foundation 6. At this time, the plurality of shaft cores 8 are inserted into the communication holes 7 formed in the first block 2, and the coupler 8 a has an enlarged diameter portion 7 a (shown in FIG. 2) formed in the lower portion of the insertion hole 7. )). Further, as shown in FIG. 11, the second block 3 is stacked on top of the first block 2. Also at this time, the shaft core 8 is inserted into the communication hole 7 formed in the second block 3. Note that an adhesive is applied to the joint surfaces of the first block 2 and the second block 3 so that the first block 2 and the second block 3 are integrated. The shaft 8 is formed to have a length slightly longer than the insertion hole 7 that is continuous when the first block 2 and the second block 3 are stacked. It is formed so as to protrude from the upper surface of the two blocks 3 with a width of about 95 mm to 105 mm.

  Next, a coupler 8a is attached to the tip of the shaft core 8 protruding from the upper surface of the second block 3, and the shaft core 8 is connected further upward. 10 and 11, the first block 2 and the second block 3 are further stacked from the upper surface of the second block 2. In this process, because the bulkhead structure 1 is installed as a pre-built building structure in a four-story middle-rise building, the stacking process is performed four times, and the corridor or stairs on the fourth floor of the middle-rise building is used. The partition structure 1 is constructed to the height.

  Next, as shown in FIG. 12, the roof slab 5 is attached and fixed to the upper surface of the second block 3.

  Finally, although not shown, the partition wall structure 1 is fixed by filling mortar (cement grout agent) into the communication hole 7 through which the shaft core 8 is inserted.

  Thereafter, the bridging portion 4 connected to the middle-rise building side shown in FIG. 4 is formed by cutting the first block 2 or the second block 3 not stacked at the center in the vertical direction. When it is necessary to cut to a length corresponding to the interval width between the middle block and the middle-layer building, after cutting, attach to the opening side of the first block at the upper end of the second block.

  Thus, even if the partition structure 1 is constructed without pulling the shaft core 8 upward, when the partition structure 1 in which the first block 2 and the second block 3 are stacked is deformed by some shaking, Since the shaft core 8 is pulled with the deformation, it is possible to apply stress to the partition wall structure 1 and to maintain an appropriate strength as a precast concrete building structure. Further, the shaft core 8 does not become excessively strong, and the maintenance cost of the partition wall structure 1 can be reduced without damaging the first block 2 or the like by the shaft core 8. You can work safely. Moreover, since the 1st block 2 and the 2nd block 3 can be manufactured cheaply, cost reduction can be aimed at largely. Also,

  In the said Example, although the partition structure 1 which concerns on this invention was made to adjoin a middle-rise building, it is also possible to adjoin to nursing facilities, such as educational facilities, such as an elementary school, and a nursing home.

DESCRIPTION OF SYMBOLS 1 Bulkhead structure 2 1st block 3 2nd block 4 Bridge part 5 Roof slab 6 Foundation 7 Communication hole 7a Expanding part 8 Axle core 8a Coupler 9 Corridor 10 Folding stairs 11 Landing

Claims (3)

A construction method of a precast concrete construction structure ,
A first step in which the lower end of the shaft core is embedded on the foundation,
A second step of installing the first precast member formed with a plurality of vertical communication holes on the foundation through the communication holes so that the tips of the shaft cores are exposed;
A third step of attaching a connecting member to the tip of the shaft core and further connecting and extending another shaft core;
A fourth step in which another precast member in which a plurality of vertical communication holes are formed is installed on the precast member by passing through the communication hole so that a tip of the extended shaft core is exposed,
The second to fourth steps are repeated to construct a precast concrete construction structure, and the length of the connected and extended shaft core is changed to a tensile force according to the deformation of the construction structure. A method for constructing a precast concrete construction structure , wherein the construction structure has a length capable of resisting and imparting stress to the construction structure . A method of constructing a bulkhead structure of a cab hoistway of an elevator for a middle-rise building attached to a corridor provided in a horizontal direction or a staircase provided in a vertical direction,
A first step in which the lower end of the shaft core is embedded on the foundation,
The first block as a precast member having a substantially U-shaped planar shape and a plurality of vertical communication holes formed therein opens the first block toward the corridor or staircase, and the tip of the shaft core is in the communication hole. A second step to be exposed and installed on the foundation;
A third step of attaching a connecting member to the tip of the shaft core and further connecting and extending another shaft core;
A second block as a precast member having a substantially rectangular shape in plan shape and a plurality of communication holes formed in the vertical direction is inserted on the first block so that the end of the extended shaft core is exposed in the communication holes. Including the fourth step to install,
After the second block is installed, the other first block is installed on the second block, and the second to fourth steps are repeated to construct a partition structure for the car room hoistway, the length of the axis which extends in the connection against the said axis tensile force according to the deformation of the partition wall structure, so that the length capable of imparting a stress to the partition wall structure A construction method of a bulkhead structure of a cab hoistway of a middle-rise building elevator characterized by the above. The opposed surface of the first block as the plane-shaped substantially U-shaped precast member is cut in the vicinity of the center in the vertical direction, or the second block as the plane-shaped approximately B-shaped precast member is near the center in the vertical direction. Cutting the line to form the bridge part,
3. The partition structure of a cab hoistway of a central building elevator according to claim 2, further comprising a step of installing the bridging portion on a middle-layer building side of the partition structure of the cab hoistway. How to build things.

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