JP2000352108A - Precast block construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To positively connect segments together, and to enhance the strength of the same, by embedding an external steel pipe in the piling direction, inserting an internal steel pipe into the external steel pipe in the piled segments, and injecting a filler in a gap between the steel pipes and the in internal steel pipe, to thereby connect the segments to each other. SOLUTION: A plurality of precast blocks as segments 2a, 2b,... constituting a structural skeleton are produced, and a plurality of external steel pipes 6 which are each penetrated through the segments in a piling direction to form sleeves are embedded in the segments at suitable intervals. When these segments 2a, 2b,... are sequentially piled up in the construction field to construct the structural skeleton, an internal steel pipe 7 to be a dowel pipe is inserted into each external steel pipe 6 in the piled segments 2a, 2b,.... Further, a filler 11 is injected in a gap between the internal steel pipe 7 and the external steel pipe 6 and in the internal steel pipe 7, to thereby connect the segments 2a, 2b,... to each other by the internal steel pipe 7. Thus, without complicating the structure, shearing transfer can be achieved with a means other than fraction between the segments.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a precast block construction method most suitable as a method for constructing a structural body such as a bridge pier.

[0002]

2. Description of the Related Art A precast block method is one of the methods for constructing a structural body such as a bridge girder, a pier, a tank, a silo, and a chimney.

[0003] This precast block method is used when it is difficult to construct a structural skeleton by casting concrete on site, for example, by dividing a structural skeleton (for example, a pier).
The precast block is manufactured as a segment at a factory or a production yard near the site, and then carried into the site to assemble and finally integrated by prestressing.

[0004] Fig. 25 shows an example of this. Only the footing 3 as a foundation is constructed from cast-in-place concrete or precast block, and a PC steel bar 4 is fixed from above onto a PC steel bar 4 having an end fixed therein. Segments 2a, 2b, 2c, 2 of precast blocks manufactured by factory
are lifted by a crane or the like, dropped and stacked one by one.

[0005] Segments 2a, 2b, 2c, 2d, 2e
... Between them, a filler material 5 made of mortar or epoxy resin is filled if necessary and joined together, and when the filler material 5 is hardened, the PC steel rod 4 is tensioned and the segments 2a, 2b, 2
A prestress is introduced between c, 2d, 2e, etc., and these are integrated to construct the pier 1.

[0006]

In such a conventional precast block construction method, the joint material 5 is interposed at the joining surface of the plurality of segments 2a, 2b, 2c, 2d, 2e,. , The shear transmission is due to the friction between the segments 2a, 2b, 2c, 2d, 2e,..., And the strength of the structure as a whole is not sufficient in terms of earthquake resistance.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned disadvantages of the prior art, and in a precast block construction method in which a plurality of precast blocks are stacked as segments to construct a structural frame, joining between the stacked segments is ensured, Another object of the present invention is to provide a precast block construction method in which the shear is transmitted by means other than friction to improve the strength and the structure is not particularly complicated.

[0008]

According to the present invention, in order to achieve the above object, firstly, a plurality of precast blocks are manufactured as segments constituting a structural frame, and the precast blocks are sequentially stacked at a construction site to form a structural frame. In the block construction method for constructing the precast block, the outer cylinder steel pipe serving as a sheath pipe is buried in the precast block by penetrating the precast block in the stacking direction, and the inner cylinder serving as a dowel pipe in the outer cylinder steel pipe of the stacked precast block. The gist of the present invention is to insert a filler into a gap between an inner tubular steel pipe and an outer tubular steel pipe and to insert a filler into the inner tubular steel pipe, and connect the precast blocks to each other with the inner tubular steel pipe.

Second, the outer tubular steel pipes are provided on all the precast blocks to be stacked, and after the completion of the stacking of all the precast blocks, the inner tubular steel pipe constituted by one piece is inserted so as to penetrate all the outer tubular steel pipes. The gist is that.

Third, the outer tubular steel pipes are provided on all the precast blocks to be stacked, and the inner tubular steel pipes are composed of a plurality of divided pipes. The gist of the invention is to insert the divided inner tubular steel pipes one by one into the outer tubular steel pipe.

Fourth, the outer tubular steel pipe is provided on all the precast blocks to be stacked, and the inner tubular steel pipe is constituted by a plurality of divided pipes. Insert the split inner steel pipes one by one into the outer steel pipes,
The gist is to provide a gap between the upper and lower inner tubular steel pipes.

Fifth, a plurality of precast blocks are manufactured as segments constituting a structural frame, and the precast blocks are sequentially stacked at a construction site to construct a structural frame. An outer tubular steel pipe that becomes a sheath pipe through this is buried, and an inner tubular steel pipe that becomes a dowel pipe inserted into this outer tubular steel pipe is formed by vertically projecting and penetrating it. The precast block provided with the tubular steel pipe and the precast block provided with the inner tubular steel pipe are alternately stacked, and the protrusion of the inner tubular steel pipe is inserted into the outer tubular steel pipe at the joint of the upper and lower precast blocks, and the inner tubular steel pipe and Inject the filler into the gap between the outer tube and the inner tube,
The gist is to connect upper and lower precast blocks to each other.

According to the first aspect of the present invention, since the inner tubular steel pipe inserted into the outer tubular steel pipe of the stacked precast blocks becomes the dowel pipe, the precast blocks are connected to each other by the inner tubular steel pipe, and the precast blocks are joined together. Shear transmission is performed not only by friction between the blocks but also by the inner steel pipe,
Strength is improved. Further, by injecting the filler into the gap between the inner tubular steel pipe and the outer tubular steel pipe and into the inner tubular steel pipe, further integration can be achieved.

According to the second aspect of the present invention, in addition to the above-described operation, the operation of inserting the inner tubular steel pipe into the outer tubular steel pipe is performed once by configuring the inner tubular steel pipe by one. Not only is the workability good, but the number of processing steps for the inner tube is also small.

According to the third aspect of the present invention, a first aspect is provided.
In addition to the operation of the present invention described above, since the inner tubular steel pipe is divided into a short length, handling becomes easy, and setting and insertion for insertion into the outer tubular steel pipe become easy. Further, since the inner tubular steel pipes can be sequentially inserted from the assembled segments, it is not necessary to complete the assembly of the segments in one day, and the workability is good.

According to the fourth aspect of the present invention, a first aspect is provided.
In addition to the operation of the present invention described above, the divided inner tubular steel pipes positioned at the joints of the upper and lower precast blocks are inserted one by one into the outer tubular steel pipe, and a gap is formed between the upper and lower inner tubular steel pipes. Since the inner tube is provided, the space as the filling space for the filler can be ensured by providing the gap while the function as the dowel tube of the inner tubular steel tube is secured, and the joining strength of the stacked segments can be improved.

According to the fifth aspect of the present invention, a precast block provided with only an outer tubular steel pipe and a precast block provided with only an inner tubular steel pipe are prepared, and these are alternately stacked to form a segment. During stacking, the inner tube can be inserted into the outer tube at the same time, and the work of inserting the inner tube after stacking the segments does not need to be performed separately, so that the workability is good and the working time can be shortened.

[0018]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view showing an example of a segment 2a (2b, 2c, 2d, 2e...) Formed by a precast block used in the precast block method according to the present invention. Was formed in a rectangular parallelepiped shape having a space in the vertical direction, and a plurality of outer tubular steel pipes 6 serving as sheath tubes were embedded at appropriate intervals. This outer tubular steel pipe 6 has a segment 2a (2
b, 2c, 2d, 2e ...).

FIG. 2 shows an inner tubular steel pipe 7 which is inserted into the outer tubular steel pipe 6 to be a dowel pipe. The inner diameter of the inner tubular steel pipe 7 is smaller than the inner diameter of the outer tubular steel pipe 6. In the first embodiment, the inner tubular steel pipe 7 is stacked. It is formed of a single long piece penetrating through the plurality of segments 2a (2b, 2c, 2d, 2e ...).

Next, using the outer tubular steel pipe 6 and the inner tubular steel pipe 7, a plurality of segments 2a (2b, 2c, 2d, 2e) are used.
…)) To build a structural frame by stacking
Will be described. FIG. 3 shows a case in which, for example, a pier 1 is constructed as a structural skeleton. In the figure, reference numeral 17 denotes an ascending and descending stair. The basic configuration of the method is the same as that of the precast block method described above with reference to FIG. Build footing 3 with cast-in-place concrete or precast blocks.

A first lowermost segment 2a is set on the footing 3, and the segment 2a is installed by a concrete dowel 8 made of cast-in-place concrete cast on the footing 3. The installation of the first lowermost segment 2a and the construction of the concrete dowel 8 are performed by setting the segment 2a above the footing 3 with a space as shown in FIG. When a formwork is assembled inside 2a and concrete is poured into the formwork by back-hitting, FIG.
As shown in (1), concrete fills the gap between the segment 2a and the footing 3 and the lower inside of the segment 2a to form the concrete dowel 8.

Alternatively, when the box 3a is provided in the footing 3, the lower portion of the segment 2a is inserted into the box 3a as shown in FIG. When the segment 2a is cast into the inside of the box blank 3a, the segment 2a is placed on the footing 3 while being buried in the concrete dowel 8 made of cast concrete. In this case, there is no need to form a mold as in the case shown in FIG.

In this way, as shown in FIG. 7, the first lowermost segment 2a is installed via the concrete dowel 8 made of cast concrete formed on the footing 3. Next, as a second step, an adhesive 9 made of epoxy resin or mortar is applied to the joining surface on the upper surface of the segment 2a as necessary as shown in FIG.

Next, as a third step, as shown in FIG. 9, the second segment 2b of the second stage from the bottom is set on the first segment 2a. The installation method is, for example, similar to the case where the first segment 2a is set on the footing 3, as shown in FIG.
Use Although not shown, if a guide key is provided at the joint between the first and second segments 2a and 2b, the two segments 2a and 2b can be joined at the corresponding correct positions by matching the guide keys.

Next, as shown in FIG. 10, as a fourth step, a PC steel material 10 for temporary fixing or final tension is tensioned between the first and second segments 2a and 2b as necessary, as shown in FIG. 1
The second segment 2b is temporarily fixed to the segment 2a.

The above steps are repeated to form a fifth step as shown in FIG.
.. are sequentially stacked on the upper part. In this state, as shown in FIG.
In this case, one long hole is formed by communicating the outer tubular steel pipes 6 provided respectively.

When the segments 2a are stacked up to a predetermined position, as a sixth step, as shown in FIG.
An inner cylindrical steel pipe 7 serving as a dowel pipe is inserted into the inside of the sheath pipe from above. As shown in FIG. 14, the inner tubular steel pipe 7 is formed of a single long piece, and the operation of inserting the plurality of communicating outer tubular steel pipes 6 only once.

Next, as a seventh step, a PC steel material 10 is inserted into the inner tubular steel pipe 7 as shown in FIG.
Then, the upper end is fixed to the uppermost segment 2e and tensed,
Segments 2a-2 stacked by introducing prestress
e ... are integrated. The fixing of the PC steel material 10 to the footing 3 is not limited to the bottom portion of the footing 3 but may be at the side portion or the upper portion of the footing 3 so that post-processing can be performed. Further, the insertion of the PC steel material 10 may be performed not after the completion of the stacking of all the segments 2a but every time the segments 2a are stacked one by one.

Finally, as an eighth step, as shown in FIGS. 16 and 17, a filler 11 made of cement paste is injected into the segments 2a to 2e from the upper or lower opening, and the inner tubular steel pipe 7 and the outer tubular steel pipe 6 are formed. And the inside of the inner tubular steel pipe 7 to be integrated.

As a result, the outer tubular steel pipe 6 serves as a sheath pipe, and the inner tubular steel pipe 7 inserted therein functions as a dowel pipe, and the plurality of stacked segments 2a to 2e are integrated. And
Since the inner tubular steel pipe 7 is provided as a dowel pipe between the plurality of segments 2a to 2e, shear transmission between the segments 2a to 2e can be performed by a method other than friction between the segments 2a to 2e, and the strength is improved. Further, since the inner tubular steel pipe 7 is used as a sheath of the PC steel material 10, workability is improved.

FIG. 18 shows a second embodiment, in which the inner tubular steel pipe 7 is not made into a single long piece, but is constituted by divided pipes 7a, 7b, 7c, 7d,... This allows
Each time the segments 2a, 2b are stacked one by one, it becomes possible to insert the inner tubular steel pipes one by one by placing them at the joint of the upper and lower segments 2a, 2b. In this case, the plurality of divided bodies 7a have a length such that those positioned at the top and bottom are joined to each other to be continuous and one whole as a whole.

Therefore, it is not necessary to handle the long inner tubular steel pipe 7, and the work of setting and inserting into the segments 2a, 2b... Becomes easy. In addition, the completed segment 2
can be sequentially inserted from a, 2b..., so that it is not necessary to complete the stacking of all the segments 2a, 2b. Can be determined.

FIGS. 19 and 20 show a third embodiment. Similar to the second embodiment, the inner tubular steel pipe 7 is divided into divided pipes 7a, 7b, 7c, and 7c.
7d, each divided pipe 7a is formed into a short piece which is located at least at the joint of the stacked segments 2a, 2b, and the divided pipes 7a, 2b,. Are sequentially inserted.

In this case, a gap is formed between the divided pipes 7a at the upper and lower positions and the divided pipes 7a are arranged discontinuously, but this gap is small as shown in FIG. However, as shown in FIG. 20, the divided pipes 7a are provided with a function as dowel pipes, and are formed to be shorter than those in the example shown in FIG. The spacing between them can be large.

In any case, as in the second embodiment, it is not necessary to handle the long inner tubular steel pipe 7, and the work of setting and inserting into the segments 2a, 2b.
.. Can be sequentially inserted from the assembled segments 2a, 2b..., So that all the segments 2a, 2b.
Need not be completed, the working process can be determined flexibly, and the material required for the inner tubular steel pipe 7 can be saved.

In the case of the third embodiment, as described above, there is a gap between the upper and lower divided pipes 7a.
are set downward, the divided tubes 7a fall downward. In order to prevent this, as shown in FIG. 21, a projecting spacer 12 is radially provided on the outer peripheral surface of the lower part of the divided pipes 7a, and a stopper 13 of the same shape is also projected on the outer peripheral surface of the intermediate portion. On the other hand, a projection 14 serving as a receiving portion for the stopper 13 is provided on the inner peripheral surface of the outer tubular steel pipe 6.

When the divided pipes 7a are inserted into the outer tubular steel pipe 6, the spacer 12 is pressed against the inner wall of the outer tubular steel pipe 6, and the lower part of the stopper 13 contacts the upper part of the projection 14. Are locked at a predetermined position inside the outer tubular steel pipe 6 and are prevented from falling downward.

Further, as shown in FIG. 22, an opening by a slit 15 can be appropriately formed in the peripheral wall of the inner tubular steel pipe 7. The slit 15 is formed, for example, in the form of a vertically elongated slot with a plurality of slits provided at appropriate intervals, so that when the filler 11 is injected into the outer tubular steel pipe 6 or the inner tubular steel pipe 7, The material 11 flows smoothly between the outer tubular steel pipe 6 and the inner tubular steel pipe 7, and the filling of the filler 11 is ensured.

FIGS. 23 and 24 show a fourth embodiment, similar to the first to third embodiments, in which a plurality of outer tubular steel tubes 6 serving as a sheath tube are buried at appropriate intervals. Separately, the outer tubular steel pipe 6 is not buried, but the segments 16a in which the inner tubular steel pipe 7 serving as the dowel pipe is buried are used. In the segment 16a in which the inner tubular steel pipe 7 is embedded, the inner tubular steel pipe 7
Has its upper and lower ends projecting vertically from the segment 16a.

In this case, if the segments 2a in which the outer tubular steel pipes 6 are embedded and the segments 16a in which the inner tubular steel pipes 7 are embedded are alternately stacked, the segments in which the inner tubular steel pipes 7 are embedded are obtained.
The inner tubular steel pipe 7 projecting downward from 16a is the lower outer tubular steel pipe 6
Is inserted into the outer tubular steel pipe 6 of the embedded segment 2a, and the inner tubular steel pipe 7 projecting upward is inserted into the outer tubular steel pipe 6 of the segment 2b in which the upper outer tubular steel pipe 6 is embedded.

Therefore, the segments 2a, in which the outer tube 6 is embedded, and the segments 16a, in which the inner tube 7 is embedded, are alternately stacked, and the inner tube 7 is inserted into the outer tube 6 simultaneously with the stacking. Good workability and shortens work time.

[0042]

As described above, according to the precast block method of the present invention, in the precast block method in which a plurality of precast blocks are stacked as segments to construct a structural frame, the joint between the stacked segments is formed by using a dowel pipe. Since it is used as a joint, it is easy and reliable to join, and shear transmission is performed by means other than friction between segments, so that strength can be improved, and the structure is particularly complicated because of this. No workability is improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a segment used in an embodiment of a precast block method according to the present invention.

FIG. 2 is a front view of the inner tubular steel pipe used in the embodiment of the precast block method according to the present invention.

FIG. 3 is an overall perspective view showing an embodiment of a precast block method according to the present invention.

FIG. 4 is a longitudinal sectional front view showing an example of a first step of the first embodiment of the precast block method according to the present invention.

FIG. 5 is a longitudinal sectional front view showing another example of the first step of the first embodiment of the precast block method according to the present invention.

FIG. 6 is an explanatory view showing a first step of the first embodiment of the precast block method according to the present invention.

FIG. 7 is a front view of the precast block method according to the first embodiment of the present invention after the dowel is formed in the first step.

FIG. 8 is a front view showing a second step of the first embodiment of the precast block method according to the present invention.

FIG. 9 is a front view showing a third step of the first embodiment of the precast block method of the present invention.

FIG. 10 is a front view showing a fourth step of the first embodiment of the precast block method of the present invention.

FIG. 11 is a front view showing a fifth step of the first embodiment of the precast block method of the present invention.

FIG. 12 is an explanatory view showing a fifth step of the first embodiment of the precast block method of the present invention.

FIG. 13 is a longitudinal sectional front view showing a sixth step of the first embodiment of the precast block method of the present invention.

FIG. 14 is a vertical sectional front view of a main part showing a sixth step of the first embodiment of the precast block method of the present invention.

FIG. 15 is a vertical sectional front view showing a seventh step of the first embodiment of the precast block method of the present invention.

FIG. 16 is a vertical sectional front view showing an eighth step of the first embodiment of the precast block method of the present invention.

FIG. 17 is a cross-sectional plan view of a main part showing an eighth step of the first embodiment of the precast block method of the present invention.

FIG. 18 is a longitudinal sectional front view showing a main part of a second embodiment of the precast block method according to the present invention.

FIG. 19 is a longitudinal sectional front view showing a main part of a third embodiment of the precast block method according to the present invention.

FIG. 20 is a longitudinal sectional front view of another example showing a main part of the third embodiment of the precast block method of the present invention.

FIG. 21 is a longitudinal sectional front view of still another example showing a main part of the third embodiment of the precast block method of the present invention.

FIG. 22 shows the first to first precast block construction methods of the present invention.
It is a vertical front view showing a main part of the third embodiment.

FIG. 23 is a perspective view of a segment of a fourth embodiment of the precast block method according to the present invention.

FIG. 24 is a longitudinal sectional front view showing a main part of a fourth embodiment of the precast block method according to the present invention.

FIG. 25 is a vertical sectional front view showing a precast block method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Bridge pier 2a, 2b, 2c, 2d, 2e ... Segment 3 ... Footing 3a ... Box removal 4 ... PC steel bar 5 ... Joint material 6 ... Outer tube steel tube 7 ... Inner tube steel tube 7a, 7b, 7c, 7d ... Split pipe 8 Concrete dowel 9 Adhesive 10 PC steel 11 Filler 12 Spacer 13 Stopper 14 Protrusion 15 Slit 16a Segment 17 Lifting stairs 18 Crane 19 Hanging tool

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takehiro Nishiko 2-19-1, Tobita-Shi, Chofu-shi, Tokyo Kashima Construction Co., Ltd. (72) Inventor Takumi Onabe 1-2-1, Moto-Akasaka, Minato-ku, Tokyo No. 7 Inside Kashima Construction Co., Ltd. (72) Hiroshi Shinbo Inventor 1-2-7 Moto Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Seiichiro Takizawa 1-2-2 Moto-Akasaka, Minato-ku, Tokyo No. 7 F-term in Kashima Construction Co., Ltd. (reference) 2D059 AA03 AA05 CC03 GG55

Claims (5)

[Claims] 1. A block construction method for manufacturing a plurality of precast blocks as segments constituting a structural skeleton, sequentially stacking the precast blocks at a construction site, and constructing a structural skeleton. The outer tubular steel pipe that becomes the sheath pipe by being penetrated is buried, and the inner tubular steel pipe that becomes the dowel pipe is inserted into the outer tubular steel pipe of the stacked precast block, and the gap between the inner tubular steel pipe and the outer tubular steel pipe and the inner pipe A precast block construction method comprising injecting a filler into a steel pipe and connecting the precast blocks to each other with the inner cylindrical steel pipe. 2. An outer tubular steel pipe is provided on all the precast blocks to be stacked, and after completion of stacking of all the precast blocks, an inner tubular steel pipe constituted by one piece is inserted so as to penetrate all the outer tubular steel pipes. 1. The precast block method according to 1. 3. The outer tubular steel pipe is provided on all the precast blocks to be stacked, and the inner tubular steel pipe is constituted by a plurality of divided pipes, and after all the precast blocks have been stacked,
2. The precast block method according to claim 1, wherein each time the precast blocks are stacked one by one, the divided inner tubular steel pipes are inserted one by one into the outer tubular steel pipe. 4. The outer tubular steel pipe is provided on all the precast blocks to be stacked, and the inner tubular steel pipe is constituted by a plurality of divided pipes. Each time the precast blocks are stacked one by one,
The precast block construction method according to claim 1, wherein the divided inner cylindrical steel pipes positioned at the joints of the upper and lower precast blocks are inserted one by one into the outer cylindrical steel pipe, and a gap is provided between the upper and lower inner cylindrical steel pipes. 5. A precast block method for producing a plurality of precast blocks as segments constituting a structural frame, sequentially stacking the precast blocks at a construction site, and constructing a structural frame, wherein the precast block penetrates through the precast blocks. An outer tubular steel pipe was provided in which an outer tubular steel pipe serving as a sheath pipe was buried, and an inner tubular steel pipe serving as a dowel pipe inserted into the outer tubular steel pipe was vertically projected and penetrated. The precast block and the precast block provided with the inner tubular steel pipe are alternately stacked, and the protrusion of the inner tubular steel pipe is inserted into the outer tubular steel pipe at the joint of the upper and lower precast blocks. A precast block method characterized by injecting a filler into the gap and the inner tubular steel pipe, and connecting the upper and lower precast blocks to each other.