JP2004352457A - Junction structure for shaft unit in elevator shaft - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an elevator shaft having a large flexural capacity between units. <P>SOLUTION: To a bottom part of a column part 16a formed at each of four corners of a shaft unit 16, a sleeve 26 opened at a lower surface, to which lower parts of main reinforcement parts 24 of a column are inserted, is integrally embedded. A mortar injecting hole is formed in a side surface of the sleeve 26 to open in a side surface of the column part 16a. As an upper unit 16 is stacked on a lower unit 16, the main reinforcements 24 protruded above the lower unit 16 are inserted into the sleeve 26, and mortar is injected into the sleeve 26 through the mortar injecting hole. The upper and the lower main reinforcements 24 are thus integrally jointed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a joining structure of a precast elevator shaft, for example.
[0002]
[Prior art]
Some existing three- to five-story middle-rise apartments do not have elevators. On the other hand, in the modern society where the aging is progressing rapidly, there is a great demand for barrier-free, and it is strongly desired to install an elevator even in an existing middle-rise apartment.
[0003]
Therefore, a plurality of elevator shaft units made of precast concrete are manufactured in advance, and the shaft units are stacked and joined to each other at an extension site, and the floor of an existing building is connected to an entrance and exit of the elevator shaft unit. A shaft extension method has been developed (Patent Document 1).
[0004]
[Patent Document 1]
JP 2001-199560 A
[Problems to be solved by the invention]
In constructing an elevator shaft with the above-mentioned precast cylinder, as the joining structure between the upper and lower precast cylinders, for example, the joining structure shown in FIG.
[0006]
In the figure, the four corner pillars 1a of the upper and lower shaft units 1 are connected by a connection fitting 3. The connection fitting 3 includes an L-shaped bracket 4 fixed to the lower and upper portions of the upper and lower column portions 1 a, a double-threaded bolt 5 fixed at both ends between the brackets 4, and a nut screwed to the upper and lower ends of the bolt 5. It consists of six. These connecting fittings 3 are arranged at respective pillar positions, and connect the upper and lower units 1 at a total of four locations.
[0007]
As a specific joining method using the above-mentioned connecting fitting 3, a mortar is cast in a gap between the two units 1 while supporting the upper unit 1, and the units 1 are connected by the bolts 5, and the level is adjusted. By tightening each bolt 5 in order to keep it constant, the two units 1 are tightened simultaneously with the level adjustment.
[0008]
However, in this joint structure, since the bracket 4, the bolt 5, and the nut 6 are exposed outside the shaft unit 1, there is a problem that not only the appearance is poor but also the effective area of the shaft is reduced. Was. In addition, there has been a demand that the bending strength be increased simply without extending the construction period.
[0009]
The present invention has been made in order to solve the above-described problems, and has a joint structure of a shaft unit in an elevator shaft without a joint structure being exposed to the outside, and having a large bending strength at a joint portion between units. To provide.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides an elevator shaft constructed by stacking and joining together elevator shaft units made of precast concrete, and a lower surface opening is formed at a bottom of a column formed at four corners of the shaft unit. And a sleeve through which the lower part of the pillar main bar is inserted is buried integrally, and a mortar injection hole which is opened on the side face of the pillar part is formed on the side face of the sleeve, and the shaft unit located on the lower side is located on the upper side. In a state where the shaft units to be stacked are stacked, the column main bars protruding on the lower side shaft unit are inserted into the sleeve, and the mortar is injected and filled into the sleeve through a mortar injection hole to integrate the upper and lower column main bars with each other. It is characterized by the fact that it is joined together. Therefore, according to the present invention, the upper and lower pillar main bars are integrally joined via the sleeve without exposing the joining structure to the outside, so that the bending strength of the entire cylinder body of the elevator shaft is improved, and the rigidity of the elevator is increased. You can get a shaft.
[0011]
Further, in the present invention, since the spiral muscle for split prevention is arranged around the sleeve and the main column, even if the main column is thicker than usual, splitting of the column itself is prevented. Will be done.
[0012]
Further, in the present invention, the height and level are adjusted each time the unit is hung by installing a metal liner for adjusting the height and level around the upper protruding end of the main pillar of the lower shaft unit. be able to.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows the entire structure of a unit type elevator shaft to which the present invention is applied.
[0014]
The elevator shaft 10 in the figure is to be added to an existing 5-story apartment house, for example. A base unit 14 made of precast concrete (hereinafter abbreviated as PCa) is installed on a foundation 12 to be constructed on site, Similarly, the PCa shaft units 16 for the first to fifth floors are successively stacked on the PCa base unit 14, respectively, and the uppermost part is covered with a PCa roof unit 18 to which an existing eave or the like is connected. A PCa floor panel 22 that connects to an existing floor 20 such as a landing is connected to the upper part of the shaft unit 16.
[0015]
The base unit 14 and each shaft unit 16 are in the form of a rectangular tube, and pillars 16a are integrally formed at four inner corners thereof. Further, an opening 16b for an entrance is opened at one side of each shaft unit 16. I have.
[0016]
The second-floor shaft unit 16 is a non-opening type unlike the others. This is because the elevator shaft 10 is extended so that the elevator can enter and exit from the landings on the ground floor and the respective intermediate floors, and the mezzanine floor can be at the ground floor if it is lowered by half a floor.
[0017]
At the top of the pillar 16a of the base unit 14 and each shaft unit 16, a pillar main bar 24 thicker than usual projects, and this main bar 24 is inserted into the lower part of the upper side column 16a to form a joint structure. .
[0018]
2 and 3 show the specific configuration. In the figure, a sleeve 26 such as a splice sleeve (registered trademark: manufactured by Nippon Splice Sleeve Co., Ltd.) into which the lower part of the main bar 24 is inserted up to its upper half is buried in the lower part of the pillar part 16a. An opening is provided at the lower part of the column 16a. Mortar injection holes 28a and 28b are provided on the upper and lower sides of the sleeve 26, and communicate with the injection holes 30a and 30b opened on the side surfaces of the column 16a.
[0019]
Further, spiral bars 32 are arranged on the outer periphery of the main bar 24 and the sleeve 26 to prevent the column 16a from splitting due to excessive stress being applied to the main bar 24 and the sleeve 26.
[0020]
In the above, in order to join the shaft units 16 to each other or to the base unit 14, as shown in FIG. 3A, first, the level and the level around the main reinforcement 24 protruding from the lower side column 16a (14a) are obtained. A plurality of iron plate liners 34 for height adjustment are installed to perform level adjustment, and a silicon sponge 36 for preventing mortar from leaking is installed around the periphery, and as shown in FIG. The lower end 16 is lowered to position the protruding end of the lower main bar 24 in the sleeve 26.
[0021]
Then, the verticality, the coaxiality, the horizontality, the coincidence with the existing floor 20, and the like between the shaft units 16 or between the foundation unit 14 and the shaft unit 16 are measured, and if it is confirmed that all of them are satisfied, the same procedure as above is performed. Thus, loading and adjustment of the shaft unit 16 on the next floor are performed.
[0022]
When the stacking and the adjustment work of the shaft units 16 on all floors are completed as described above, the non-shrinkable mortar is injected through the lower injection hole 30b as shown by the arrow in FIG. At the same time, the space between the lower pillar portions 16a (14a) is also filled.
[0023]
When all the mortar is filled in the gap, the remaining mortar overflows through the upper injection hole 30a.
[0024]
At this stage, the upper and lower units 16 (14) are integrated with each other by closing the upper injection hole 30a with a filling plug and curing and solidifying.
[0025]
Since the upper and lower column main reinforcements 24 are integrated via the sleeve 26 in the joined state, the bending resistance of the entire cylindrical body of the elevator shaft 10 is increased, and an elevator shaft with high rigidity can be obtained.
[0026]
In the above embodiment, the mortar injection work is performed after the completion of the assembly of all the units. However, it is needless to say that the mortar injection work may be performed for each unit assembly and level adjustment.
[0027]
【The invention's effect】
As is clear from the above description, in the joint structure of the shaft unit in the elevator shaft according to the present invention, the joint structure is not exposed to the outside and the bending strength at the joint between the units is large. The joint structure of the shaft unit can be obtained.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of an elevator to which a joining structure of the present invention is applied.
FIG. 2 is a perspective view of a main part of the joint structure.
FIGS. 3 (a) and 3 (b) are cross-sectional views of a main part showing the construction procedure.
FIG. 4 is a sectional view of a main part showing a conventional joint structure between shaft units.
[Explanation of symbols]
10 Elevator shaft 14, 16 Precast shaft unit (14 foundation unit)
14a, 16a Column portion 24 Column main reinforcement 26 Sleeve 28a, 28b, 30a, 30b Mortar injection hole 32 Spiral reinforcement 34 Iron plate liner for height and level adjustment

Claims (3)

In building an elevator shaft by stacking and joining together elevator shaft units made of precast concrete,
A lower surface opening is formed at the bottom of a pillar formed at each of the four corners of the shaft unit, and a sleeve having a lower portion of a pillar main bar inserted therein is integrally embedded therein, and a mortar injection hole which is opened at a side of the pillar at the side of the sleeve. Forming
In a state where the shaft unit located on the upper side is stacked on the shaft unit located on the lower side, the column main reinforcement projecting on the lower side shaft unit is inserted into the sleeve,
A joint structure of a shaft unit in an elevator shaft, wherein upper and lower main pillars are integrally joined by injecting and filling mortar into the sleeve through a mortar injection hole. The joint structure of a shaft unit in an elevator shaft according to claim 1, wherein a spiral streak for preventing splitting is arranged around the sleeve and the main bar. The joint structure of a shaft unit in an elevator shaft according to claim 1 or 2, wherein a metal liner for adjusting a height and a level is provided around an upper protruding end of a pillar main bar in the lower shaft unit.

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