JP3237076B2 - Steel reinforced concrete continuous basement wall - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel-framed reinforced concrete (hereinafter, abbreviated as SRC) continuous underground wall which is mainly used for construction of a large-scale, deep underground structure.

[0002]

2. Description of the Related Art Conventionally, a general continuous underground wall has been made of reinforced concrete using a reinforcing bar as a reinforcing member. However, in response to the recent trend of using deep underground space, a steel base and a reinforcing bar have been used. Steel reinforced concrete construction (hereinafter referred to as SR
Abbreviated as C. ) Continuous underground walls are also being developed. This SRC
In the case of a continuous underground wall, it is necessary to join the steel frames of the upper and lower steel frame units when building a steel frame cage,
The joint is generally formed by welding or high-strength bolting (Japanese Patent Application No. 4-34722 of the prior application).
No.5 SRC continuous underground wall construction method etc.). At that time, an in-plane connector or the like for integrating with the trailing wall unit is attached to the steel frame at the end adjacent to the trailing wall unit by welding or the like.

When the upper and lower steel frames of the preceding wall unit are joined by high-strength bolts, as shown in FIG. 8, a steel frame c at the end of an upper steel rebar unit a constituting the preceding wall unit and a lower steel frame. At the exposed joint portion of the end of the reinforcing bar unit b with the steel frame d, CT steel e which also serves as a partition plate cleaning jig rail and water stop is attached to the outer surface of the web in advance, and the U-shaped reinforcing bar is attached to the side surface of the flange. The in-plane connector f is attached and fixed in advance. Therefore, the web surface is C
Two splice plates m, m are applied with the T steel e sandwiched therebetween (FIG. 8C), and the splice plates m, m are tightened and fixed with a high-strength bolt k from above. Further, the splice plate g is applied to the in-plane connector f on the flange surface, and the in-plane connector f is welded later with the high-strength bolt k from above the splice plate g (FIG. 8B).
After the joining is completed, the mesh reinforcing bar n is applied to the exposed joint portion, and the upper and lower reinforcing bars j, j are all joined together and the integrated steel frame reinforcing member is integrated with the wall groove h.
Then, the concrete i is poured into a predetermined position, and the preceding wall unit is constructed (FIG. 8A). Thereafter, although not shown, an adjacent trailing wall unit is similarly constructed,
Both units are integrally joined via the in-plane connector f.

[0004]

[Problems to be Solved by the Invention] As a joint means between upper and lower steel frames, when welding is used, there is little problem in fitting in-plane connectors or the like, but immediately after welding of the joint portion, the steel frame is stabilized. It is difficult to control the quality of welds, for example, it cannot be inserted into the liquid. Further, the welding work is liable to be restricted in that the welding work cannot be performed at the time of rain or snow unless a roof is provided. Therefore, in general, the above-described bolt joining which is advantageous in the process is adopted.

[0005] However, in the case of the bolt connection, if the CT steel e and the in-plane connector f are pre-attached to the joints of the upper and lower steel frames c and d, a splice plate that fits inside the flanges of the steel frames c and d is used. g has a shape in which the in-plane connector f is interposed therebetween, and does not form a frictional connection with the flange surface. Further, the splice plate m, which is applied to the outer surfaces of the webs of the steel frames c and d, has to be arranged and shaped so as to avoid the CT steel e, and the operation is troublesome and complicated. Have been.

[0006] Therefore, an object of the present invention is to securely bolt-join the steel frames of the upper and lower steel rebar units.
By providing a high quality SRC continuous basement wall that saves the labor of installing CT steel and in-plane connectors, shortens the construction period, and ensures the integrated continuity of the leading wall unit and the trailing wall unit. is there.

[0007]

Means for Solving the Problems As means for solving the above-mentioned problems in the prior art, the SRC continuous underground wall according to the first present invention comprises an upper steel rebar unit 1 and a lower steel rebar unit 2 respectively. A steel frame reinforcing member in which steel frames 3 and 4 are bolted via a splice plate is inserted into a groove 18 for a wall excavated in the ground, and concrete 14 is cast to construct a preceding wall unit 15 and then the adjacent wall unit 15 is constructed. In a steel-framed reinforced concrete continuous basement wall in which the trailing wall unit 16 is similarly constructed, and both are integrally joined via an in-plane connector, at both ends of the upper steel reinforced unit 1 and the lower steel reinforced unit 2, The upper and lower steel frames 3 and 4 located on the outer joints of the webs 30 and 40 are provided with T-shaped members such as CT steel 5 protruding in the direction of the trailing wall unit 16. Abuts the chair plate 6 (FIG. 3),
The web 3 through the web splice plate 6
0 and 40 are joined together by bolts 9 and nuts 10 (FIG. 2), and a splice plate 8 for a flange provided with an in-plane connector 7 such as a U-shaped reinforcing bar is provided at the joint of the flanges 31 and 41. (FIG. 4), and the flanges 31 and 4 are interposed via the flange splice plate 8.
It is characterized by having a configuration in which the bolts 1 are joined together by bolts 9 and nuts 10 (FIGS. 2 and 1).

The flange splice plate 8 attached to the outer surfaces of the flanges 31 and 41 is provided with the wall groove 1.
A partition plate 12 having a width substantially in contact with the wall surface of No. 8 is attached (FIG. 5) or is formed of flat steel 13 and the flat steel 13 is integrally formed with an in-plane connector formed as a perforated plate (FIG. 6). Also features. When the splice plate 8 for a flange abuts on the inner surfaces of the flanges 31 and 41, the outer surfaces of the flanges 31 and 41 are provided with a partition plate 12 having a width substantially abutting the wall surface of the groove 18 for the wall. The splice plate 11 is also contacted and bolted (FIG. 2).

As shown in FIG. 7, the SRC continuous underground wall according to the second invention does not use the flange splice plate 8 of the configuration of the first invention, and
0, the through holes 30a, 40a are provided at positions avoiding the web splice plate 6, and the through holes 30a, 40a
It is also characterized by a configuration in which an in-plane connector 7 such as a U-shaped reinforcing bar is inserted through Oa.

[0010]

A T-shaped steel such as CT steel 5 is previously attached to the web splice plate 6 (FIG. 3), and an in-plane connector 7 is previously attached to the flange splice plate 8 (FIG. 4). . Therefore, the upper and lower webs 3 are formed at the joints of the upper and lower steel rebar units 1 and 2.
The connector is arranged at a desired position only by abutting the web splice plate 6 on 0 and 40 and the flange splice plate 8 on the upper and lower flanges 31 and 41 and joining them with bolts. Thus, the upper and lower steel frames 3 and 4 can be firmly joined together by taking a frictional force (FIG. 2).

The concrete 14 is cast on the leading wall unit 15 and the concrete 14 is cast on the trailing wall unit 16 after the trailing wall unit 16 is constructed. The leading wall unit 15 and the trailing wall unit 16 are embedded in the trailing wall unit 16.
(See FIG. 1).

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
FIG. 1 shows a joint portion between the leading wall unit 15 and the trailing wall unit 16. The leading wall unit 15 is shown in FIG.
Of the upper steel rebar unit 1 and the lower steel rebar unit 2 shown in (1) is inserted into the wall groove 18 excavated in the ground by connecting the steel frames 3 and 4 with bolts via a splice plate. , Concrete 14 is cast.

Reference numeral 6 in the drawing denotes a splice plate for a web, which is a splint, which is in contact with the outer surfaces of the webs 30 and 40 at the joints of the upper and lower steel frames 3 and 4 (see FIG. 2). The web splice plate 6
0 (40) is formed in a vertically elongated shape slightly shorter than the inner dimension,
It has a configuration having a plurality of bolt holes 6a that match the bolt holes drilled in the webs 30, 40 of the upper and lower steel frames 3, 4 (FIG. 3). The splice plate for web 6 has CT steel 5 protruding in the direction of the trailing wall unit 16.
Are previously fixed to the center position of the plate by welding.

Reference numeral 8 in the drawing denotes a splice plate for a flange that is in contact with the inner surfaces of the flanges 31 and 41 in the joints of the upper and lower steel frames 3 and 4 (see FIG. 2). The width of the splice plate 8 is
A plurality of bolt holes 8a which are formed in a vertically long shape smaller than about の of the width dimension of 1 (41) and which are formed in the flanges 31 and 41 of the upper and lower steel frames 3 and 4 are provided. (FIG. 4). The flange splice plate 8 is provided with a plurality of in-plane connectors 7 each having a U-shaped reinforcing bar projecting in the groove direction (however, the shape is not limited to the U-shape and is implemented in various known shapes and structures). They are welded in advance in a substantially parallel arrangement (FIG. 4).

In the drawing, reference numeral 12 'denotes a partition plate which is formed to have a width substantially in contact with the wall surface of the wall groove 18 and is fixed at the center of each of the outer surfaces of the flanges 31 and 41 at its end. The concrete 14 cast on the leading wall unit 15 is the trailing wall unit 1
It is provided to prevent it from going around the 6 side. Therefore, the lower steel rebar unit 2 which is inserted into the wall groove 18 and whose upper end is fixed by a jig (not shown),
The upper steel rebar unit 1 is suspended at a position immediately above the unit. The upper and lower steel frames 3, 4 which are positioned and abutted on both ends of each of the units 1, 2 are spread over the outer surfaces of the webs 30, 40 at substantially equal lengths. The plate 6 abuts, and the inner surfaces of the webs 30 and 40 have T
Normal splice plate 6 'with no profile
And the webs 30 and 40 are firmly joined to each other by tightening and fixing with high-strength bolts 9 and nuts 10. The splice plate for web 6 already has CT steel 5
, There is no need to separately attach the CT steel 5. In addition, the flange surfaces of the upper and lower steel frames 3 and 4 are provided on both sides of the leading wall unit 15 and the trailing wall unit 16 so as to extend over the inner surfaces of the flanges 31 and 41 at substantially equal lengths. Splice plate 8
And a normal splice plate 8 ′ without an in-plane connector is applied to the outer surfaces of the flanges 31 and 41. The flanges 31 and 41 are firmly joined to each other by being fastened and fixed with the high-strength bolt 9 and the nut 10, respectively. In this case, the flanges 31, 4
Normal splice plate 8 'abutting on the outer surface of 1
As the partition plate 12 having a width substantially in contact with the wall surface of the wall groove 18.
The spliced plate 11 with the partition plate to which is welded may be contacted and bolted (FIG. 2). At this time, the partition plate 12 'on the outer surface of the flanges 31, 41 is attached to a position avoiding the partition plate 12 of the splice plate 11 with the partition plate (see FIG. 2). Incidentally, the flange splice plate 8 having the above-described configuration can be put into contact with the outer side surfaces of the flanges 31 and 41 for implementation. In any case, since the in-plane connector 7 is attached to the flange splice plate 8, it is not necessary to attach the in-plane connector.

Thus, the steel frame reinforcing member integrally joined up and down is installed at a regular position in the wall groove 18 and concrete 14 is cast, and then the wall groove 18 on the trailing wall unit 16 side is formed. After the excavation is completed, the trailing wall unit 16 is constructed in the same manner as the preceding wall unit 15 and the concrete 14 is cast, whereby the CT steel 5 and the in-plane connector 7 are buried in the trailing wall unit 16 and both units are buried. 15 and 16 are continuously and integrally joined, and the performance as a continuous underground wall is effectively exhibited.

[0017]

FIG. 5 shows a flange splice plate 8 used on the outer surfaces of the upper and lower flanges 31, 41. That is, the splice plate 8 is configured so that the overall shape is such that the splice plate 8 (see FIG. 4) for the inside of the flange is integrated in a symmetric arrangement in the left-right direction. And the splice plate 8 of the configuration
A partition plate 12 having a width substantially in contact with the wall surface of the wall groove 18 is mounted in advance at a substantially central position by welding.

Further, the splice plate 8 for the outer side of the flange may be constituted by a single flat steel plate 13 including an in-plane connector as shown in FIG. That is,
This splice plate has an overall shape of flat steel 13,
Instead of the U-shaped reinforcing bar, a hole 13a for improving the filling property of the concrete 14 is integrally formed with an in-plane connector formed as a perforated plate having a large number of perforations, and a central portion is formed by a bolt 9 and a nut 10 with a flange 31. , 41. Note that a partition plate 12 having a width substantially in contact with the wall surface of the wall groove 18 is attached to a substantially center position of the splice plate 13 in advance.

These splice plates for the outside of the flange have the same operation and effects as those of the splice plate for the inside of the flange 8 of the first embodiment, and the partition plate 12 is previously mounted on the plate. This eliminates the need for installation, and the SRC continuous underground wall can be constructed even more efficiently.

[0020]

FIG. 7 shows an in-plane connector 7 with a web 30,
40 shows an embodiment in the case where it is provided and used at 40. That is, the configuration is substantially the same as that of the first embodiment shown in FIG. 1, but the splice plate 8 for flanges to which the in-plane connector 7 is attached is not used, and the normal splice plate 8 ′ is used for the webs 30 and 40. Bolted.
The heads of the high-strength bolts 9 bolted to the flanges 31 and 41 from the ends of the web splice plates 6 and 6 ′ are located at positions avoiding the web splice plates 6 and 6 ′ in the webs 30 and 40. Web 3 between
On the 0 and 40 planes, through-holes 30a and 40a through which the base end of the U-shaped reinforcing bar (in-plane connector) 7 can be inserted are provided. Therefore, after the upper and lower steel members 3 and 4 are bolted together, the in-plane connector 7 such as a U-shaped reinforcing bar can be inserted into the through-holes 30a and 40a to be installed, which is excellent in workability and substantially the same as in the first embodiment. The operation and effect of

[0021]

According to the SRC continuous underground wall according to the present invention, when connecting the steel frames of the upper and lower steel rebar units, the connector does not become an obstacle and the upper and lower steel frames are securely and firmly bolted to each other. And contribute to the construction of a high quality SRC continuous underground wall. In addition, since the connector is provided on the splice plate in advance, installation work of the in-plane connector and the like can be omitted, the workability is excellent, and the continuity of the preceding and subsequent units can be secured by the connector.

[Brief description of the drawings]

FIG. 1 is an enlarged plan view showing a joint portion between a preceding wall unit and a following wall unit.

FIG. 2 is a side view showing a joined state of upper and lower steel members.

FIG. 3 is a perspective view showing a web splice plate.

FIG. 4 is a front view showing a splice plate for a flange.

FIGS. 5A and 5B are a plan view and a front view showing a use state of the splice plate of the second embodiment.

FIGS. 6A and 6B are a plan view and a front view showing a use state of a splice plate according to a different second embodiment.

FIG. 7 is a plan view showing a third embodiment.

FIGS. 8A, 8B, and 8C are a plan view, a front view, and a side view showing a conventional steel frame rebar unit.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 upper steel rebar unit 2 lower steel rebar unit 3 upper steel frame 30 web 30 a through hole 31 flange 4 lower steel frame 40 web 40 a through hole 41 flange 5 CT steel 6 web splice plate 7 in-plane connector 8 flange splice Plate 9 Bolt 10 Nut 11 Splice plate with partition plate 12 Partition plate 13 Flat steel 15 Leading wall unit 16 Trailing wall unit 18 Wall groove

──────────────────────────────────────────────────続 き Continuing on the front page (72) Eiji Sato, Inventor, 1-5-chome, Otsuka, Inzai-cho, Inba-gun, Chiba Prefecture No. 5 Takenaka Corporation Technical Research Institute (72) Inventor Takahiro Moi 1-chome Otsuka, Inzai-cho, Inba-gun, Chiba Prefecture In-house Takenaka Corporation Technical Research Institute (56) References JP-A-6-193050 ( JP, A) JP-A-56-142920 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E02D 5/20 102 E02D 5/12

Claims (6)

(57) [Claims] 1. A steel frame reinforcing member in which respective steel frames of an upper steel frame reinforcing unit and a lower steel frame reinforcing unit are bolted via a splice plate is inserted into a wall groove excavated in the ground and casts concrete. Then, the leading wall unit is constructed, then the adjacent trailing wall unit is constructed in the same way, and the two are integrally connected via an in-plane connector. The upper and lower steel frames located at both ends of the side steel rebar unit are each brought into contact with a splice plate for a web having a T-shaped member protruding in the direction of a trailing wall unit, at a joint portion on the outer surface of the web. The steel webs are bolted together via a plate, and the flange joints have in-plane connectors. A steel-framed reinforced concrete continuous basement wall, wherein a flange splice plate is abutted and flanges of steel frames are bolted to each other via the flange splice plate. 2. A steel reinforcement body in which each of the upper steel rebar unit and the lower steel rebar unit is bolted via a splice plate is inserted into a groove for a wall excavated in the ground and casts concrete. Then, the leading wall unit is constructed, then the adjacent trailing wall unit is constructed in the same way, and the two are integrally connected via an in-plane connector. The upper and lower steel frames located at both ends of the side steel rebar unit are each brought into contact with a splice plate for a web having a T-shaped member protruding in the direction of a trailing wall unit, at a joint portion on the outer surface of the web. The steel webs are bolted together via a plate, and the web splice plate in the web is avoided. A continuous underground wall of steel-framed reinforced concrete, wherein a through hole is provided at a position where a beam is formed, and an in-plane connector is inserted into the through hole. 3. The steel frame according to claim 1, wherein a partition plate having a width substantially in contact with a wall surface of the wall groove is mounted on the flange splice plate mounted on the outer surface of the flange. Continuous reinforced concrete basement wall. 4. The continuous underground wall of a steel-framed reinforced concrete structure according to claim 1, wherein the in-plane connector is formed of a U-shaped reinforcing bar. 5. The flange splice plate mounted on the outer surface of the flange is made of flat steel, and the flat steel is formed integrally with an in-plane connector formed as a perforated plate. Or the steel-framed reinforced concrete continuous basement wall described in 3. 6. A splice with a partition plate, wherein a splice plate for the flange is in contact with the inner surface of the flange at the joint portion of the flange, and a partition plate having a width substantially in contact with the wall surface of the groove for the wall is attached. The plate is abutted on the outer surface of the flange, and the flanges of the steel frame are bolted to each other through the splice plate with a partition plate sandwiching the flange and the splice plate for the flange. Or the steel-framed reinforced concrete continuous underground wall described in 4.