JPH0642181A - Temporary tightening nut self-weight fastening device and method of execution for precast-prestressed concrete pole therewith - Google Patents

Abstract

PURPOSE:To make improvements in the safety secureness of operation and work efficiency by getting rid of an operator's dangerous high lift work in the erection of precastprestressed concrete poles, while reducing manhours for crane work. CONSTITUTION:A round nut 13 being screwed in a vertical hole 12, where a Ps steel rod 5 is inserted, and an external thread 5a of this Ps steel rod 5 is housed in a nut storage part 14, and two plane-view circular ball grooves 18, 19, where two balls are entered half by half, are formed in each of up and down planea and circumferential vertical surfaces with the nut storage part 14 and the round nut 3. In addition, the nut storage part 14 and the round nut 13 are made so as to contact with each other via a lot of balls 16, 17 inserted into these ball grooves 18, 19, and then a mounting seat plate 22 is attached tight to a nut housing 15, constituting a temporary tightening nut self-weight clamping device 11, and using this device 11, a nut on top of the Ps rod 5 of a Ps-Ps pole 1 is temporarily clamped tight.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mainly for precast prestressed concrete pillars (hereinafter referred to as PcPs pillars) to be tentatively tightened with a self-weighting nut for temporarily tightening a nut on the upper part of a Ps steel rod. apparatus,
And P using this temporary tightening nut self-weight tightening device
It relates to a construction method of a cPs pillar.

[0002]

2. Description of the Related Art First, a construction example of conventional PcPs pillar erection work will be described with reference to FIGS. 4 (1) to 4 (7). (1) First, the tower scaffold 2 is assembled close to the building position of the PcPs pillar 1. (2) Next, the through bolt 3 is passed through the upper portion of the PcPs pillar 1 placed on the floor, and the hanging jig 4 is attached thereto. In this PcPs pillar 1, a Ps steel rod 5 is penetrated through a sheath tube embedded in precast concrete, and when the PcPs pillar 1 is lifted to the male thread of the upper end of the Ps steel rod 5, P
A nut 6 is screwed in so that the steel rod 5 does not fall out. (3) Next, the hanging jig 4 is hung on the hanging wire of the crane to hang the PcPs pillar 1 on the existing pillar 7 such as a foundation pillar, and the main bar or Ps steel rod protruding from the upper end surface of the existing pillar 7. In the upper half of the screw joint 9 in which the lower half is screwed into the male thread of 8,
Turn the Ps steel rod 5 for introducing prestress coming out from the lower end of the cPs pillar 1 and screw the male screw of the lower end of the Ps steel rod 5 into the main bar of the existing pillar 7 or the Ps steel rod 8 of the PcPs pillar 1.
The steel rod 5 is temporarily joined. (4) Next, when the PcPs pillar 1 is lowered and the PcPs pillar 1 is deposited on the upper end surface of the existing pillar 7, the Ps steel rod 5 passed through the sheath tube is pushed up. Therefore, the nut 6 for preventing the upper end of the Ps steel rod 5 from coming off is removed, and when the PcPs pillar 1 is lifted in the next step, the upper end of the Ps steel rod 5 temporarily joined to the existing pillar 7 is the upper end surface of the PcPs pillar 1. Be able to withdraw from. This work is performed by a worker climbing on the tower scaffolding 2, transferring to the stigma of the PcPs pillar 1, and attaching a lifeline. (5) Next, the PcPs pillar 1 is lifted again to PcP.
At the bottom of the s pillar 1, the worker turns the Ps steel rod 5 to completely screw the male thread of the Ps steel rod 5 into the upper half of the screw joint 9, and the main bar of the existing pillar 7 or the PcPs pillar to the Ps steel rod 8. 1
The Ps steel rod 5 of No. 3 is permanently joined. During this time, the nut 6 on the stigma
The worker who removes the item returns to the tower scaffold 2 and waits with the lifeline attached. (6) Next, while the worker under the PcPs pillar 1 is adjusting the building of the PcPs pillar 1 using a transit etc., Pc
The Ps pillar 1 is hung on the upper end surface of the existing pillar 7. Turret Scaffold 2
Then, the worker who was waiting at moves to the pillar head of the PcPs pillar 1 again, and the nut 6 is screwed into the male screw on the upper part of the Ps steel rod 5 protruding from the upper end surface and temporarily tightened. (7) Next, the worker returns to the tower scaffold 2 from the PcPs pillar 1, leans out from the tower scaffold 2, and removes the hanging jig 4 and the through bolt 3 from the PcPs pillar 1. After this, a Pc beam and a half Pc slab are supported on the pillar head of the PcPs pillar 1, and the Ps steel rod 5
Introduce post tension to and pour slab concrete. Hereinafter, the above process is repeated on the upper part of the PcPs pillar 1 on the lower floor to proceed with the construction to the upper floor. In the erection of the PcPs pillar 1, it is possible to replace the tower scaffold 2 with a self-propelled lifting type table lifter to reduce the lifting labor of the worker to a high place, but in any case, (4) of the above process , (5),
Since (6) and (7) are work in which the worker climbs the PcPs pillar 1 or the tower scaffolding 2, improvement is required from the viewpoint of safety and workability of construction.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the problems in the conventional construction of PcPs columns described above, and has been made with the object of improving the problems. In the construction of PcPs columns, it is dangerous for workers. To provide a temporary tightening nut self-tightening device that can eliminate work in high places, reduce man-hours for crane work, ensure work safety, and improve work efficiency, and a PcPs pillar construction method using the same. Is intended.

[0004]

To achieve the above object, the present invention comprises a vertical hole for loosely inserting a Ps steel rod for introducing prestress, and a round nut screwed to the male screw of the Ps steel rod. A round nut is stored in the nut housing portion of the nut housing that forms a nut housing portion that is concentric with the vertical hole,
A ball groove with a circular shape in plan view, into which each hemisphere of the ball is inserted, is formed on each of the upper and lower planes of the nut storage part and the round nut that are in contact with the round nut and the vertical surface in the circumferential direction. A nut for temporarily tightening a self-tightening nut, in which a nut seat and a round nut are brought into contact with each other via a large number of balls inserted in the nut housing, and a seat plate for attachment is fixed to the nut housing. The PcPs pillar construction method is characterized by using a temporary tightening nut self-weight tightening device that allows temporary tightening of the nut on the Ps rod of the PcPs pillar.

[0005]

The temporary tightening nut self-weight tightening device of the present invention is attached to the Ps steel rod disposition position on the upper end surface of the PcPs column, and the round nut is embedded in the PcPs column and the sheath tube is penetrated through the upper end portion of the Ps steel rod. Insert the PcPs column into the male screw as appropriate, hang the PcPs column above the existing column with a crane, and attach the Ps steel rod from the lower end face of the PcPs column to the main bar or the Ps steel rod from the upper end face of the existing column first. From the main joining. Then, as the PcPs column is lowered, the weight of the PcPs column acts on the nut housing of the temporary tightening nut self-weight tightening device and the round nut through the balls to rotate down the screw slope of the male screw of the Ps steel rod. The round nut is screwed as the PcPs pillar is lowered, and the nut on the Ps rod upper part of the PcPs pillar is automatically temporarily tightened. Therefore, the conventional process (3)
In the work of temporarily joining the Ps steel rod of the PcPs column to the main bar of the existing column or in the Ps steel rod in step (4), the temporary lowering operation of the crane and the nut removal work of the upper portion of the Ps steel rod in step (5) Crane raising operation and Ps
The main joining work of steel rods, the descending operation of the crane again in the process (6) and the temporary tightening work of nuts on the upper part of the Ps steel rods are omitted, and the dangerous high work of workers is eliminated, ensuring work safety and work efficiency. Is significantly improved.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to an embodiment shown in the drawings. 1 and 2, 1 is a PcPs pillar, 10
Is a sheath tube embedded in the PcPs column 1, 5 is a Ps steel rod inserted through the sheath tube 10, 11 is a temporary tightening nut self-weight tightening device of the present invention, and the temporary tightening nut self-weight tightening device 11 is PcPs Vertical hole 12 for loosely inserting Ps steel rod 5 of pillar 1, and male screw 5a formed at the upper end of Ps steel rod 5
A round nut 1 is formed in a nut housing portion 14 of a nut housing 15 in which a nut housing portion 14 for housing a round nut 13 engraved with a female screw 13a to be screwed in is formed concentrically with a vertical hole 12.
3 is stored and the round nut 13 that is stored in the nut storage portion 14 and the round nut 13 that contacts the nut storage portion 14
Ball grooves 18 and 19 in plan view, into which the hemispheres of the balls 16 and 17 are inserted, are formed on the upper and lower planes of the nut housing portion 14 and on the vertical surfaces in the circumferential direction.
The round nut 13 and the nut storing portion 14 are brought into contact with each other through a large number of balls 16 and 17 inserted in
The contact friction of 3 is reduced as much as possible. The nut housing 15 is fixed to the seat plate 22 by the bolts 21 inserted through the mounting pieces 20 fixed to the nut housing 15, and the seat plate 22 is attached by the bolts 24 to the screw sleeve 23 embedded in the PcPs pillar 1. The nut housing 15 of the illustrated example is a hexagonal nut type which is made into a vertical two-split type so that the round nut 13 is stored in the nut storing portion 14, but the external shape is arbitrary and it is a horizontal two-split type. The round nuts 13 may be housed in a single row, and the balls 17 to be inserted between the round nuts 13 and the vertical surfaces in the circumferential direction of the nut housing portion 14 are double rows. Of course, these modes can be appropriately selected.
In the figure, 25 is a release screw for the reverse rotation preventing claw that stops the rotation of the round nut 13 in the pulling direction, and 26 is a weight drop prevention nut that prevents the Ps steel rod 5 from rotating and dropping from the round nut 13. It can be installed as needed.

Next, a construction method for erection work of the PcPs pillar 1 using the temporary tightening nut self-weight tightening device 11 will be described with reference to FIG.
The steps will be sequentially described. (1) In this construction method, a tower scaffold is not required at the built-in position of the PcPs pillar 1, and first, the temporary tightening nut self-weight tightening device 11 is installed at the insertion position of the Ps steel rod 5 on the upper end surface of the PcPs pillar 1 placed on the floor.
Through the seat plate 22 with the bolt 24 as shown in FIG.
The threaded sleeve 23 embedded in the upper end surface of the cPs pillar 1 is screwed in and attached, and the male thread 5a of the upper end portion of the Ps steel rod 5 is appropriately screwed into the female thread 13a of the round nut 13 of the temporary tightening nut self-tightening device 11. At the same time, the hanging jig 4 is attached to the upper part of the PcPs pillar 1 through the through bolt 3. (2) Next, the hanging jig 4 is hung on the hanging wire of the crane to hang the PcPs pillar 1 on the existing pillar 7, and the main bar or Ps steel rod protruding from the upper end surface of the existing pillar 7 such as a foundation pillar. In the upper half of the screw joint 9 in which the lower half is screwed into the male screw, Pc
Turn the Ps steel rod 5 protruding from the lower surface of the Ps pillar 1 and screw in the male screw at the lower end to attach P to the main bar of the existing pillar 7 or the Ps steel rod.
The Ps steel rod 5 of the cPs pillar 1 is permanently joined at this stage. (3) Immediately thereafter, the PcPs pillar 1 is lowered to the upper end surface of the existing pillar 7 while the building adjustment of the PcPs pillar 1 is performed using a transit or the like. As the PcPs pillar 1 descends, the weight of the PcPs pillar 1 acts on the round nut 13 through the nut housing 15 of the temporary tightening nut self-weight tightening device 11, the balls 16 and 17, and the male screw 5 of the Ps steel rod 5
Rotating force is generated to go down the beveled surface of a, and the round nut 13
Causes the screw 5a to be advanced as the PcPs pillar 1 descends, and the nuts on the upper part of the Ps steel rod 5 of the PcPs pillar 1 are automatically temporarily tightened. The above work does not become work at height, and Pc
It is performed under the Ps pillar 1. (4) Next, the hanging jig 4 and the through bolt 3 are removed from the PcPs pillar 1, but this work can be performed safely by using a self-propelled lifting type table lifter 27, without the effort of going up and down to a high place. be able to. Next, a Pc beam and a half Pc slab are supported on the pillar head of the PcPs pillar 1, after which the temporary tightening nut self-weight tightening device 11 is removed, post tension is introduced into the Ps steel rod 5, and slab concrete is poured. . This work is safe because it is carried out on the upper floor where the Pc beams and half Pc slabs are suspended. Below, Pc on the lower floor
The above process is repeated on the upper part of the Ps pillar 1 to advance the work to the upper floor. That is, according to the present construction method, the nut removing work on the upper portion of the Ps steel rod of the pillar head performed in the step (4) of the conventional construction method,
And temporary lowering operation of crane for this, process (5)
The main joining work of the Ps steel rod to the screw joint performed in step 2, the crane raising operation for this purpose, the crane lowering operation performed in step (6), and the temporary tightening work of the nut on the upper part of the Ps steel rod are omitted. Dangerous work in high places will be eliminated, work safety will be secured and work efficiency will be greatly improved.

[0008]

As described above, according to the present invention, the PcPs
By constructing a PcPs pillar using a temporary tightening nut self-weight tightening device that automatically temporarily tightens the nut on the upper part of the Ps steel rod when the PcPs pillar is built using the self-weight of the pillar.
As scaffolding and work at high places by workers are eliminated, the number of man-hours for crane work is reduced, work safety can be ensured, and work efficiency can be greatly improved, which greatly contributes to the reduction of construction costs. To be

[0009]

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a temporary tightening nut self-weight tightening device according to the present invention.

FIG. 2 is a plan view of the temporary tightening nut self-weight tightening device.

3 (1) to (4) are views sequentially showing a construction method of erection work for precast / prestressed concrete columns using the temporary tightening nut self-weight tightening device according to the present invention in accordance with steps, (1) Attach the temporary tightening nut self-weight tightening device to the upper end surface of the PcPs pillar, and
The step of attaching the hanging jig to the upper part of the s pillar, (2) is Ps
Pc pillar is lifted, and P is added to the main bar of the existing pillar or Ps steel rod.
The step of permanently joining the lower part of the Ps steel rod of the cPs column, (3),
A process of descending while adjusting the PsPc column, and temporarily tightening the nut on the upper part of the Ps steel rod by the self-weight tightening device,
(4) is a diagram showing a step of removing the hanging jig from the PsPc column using a table lifter, respectively.

4 (1) to (7) are diagrams sequentially showing an example of construction of a conventional PsPc pillar erection work, and (1) shows
Turbine scaffold assembly step, (2) step of mounting a PsPc column suspension jig, (3) step of suspending a PsPc column, and temporarily joining a Ps steel rod of a PcPs column to a main bar of an existing column or a Ps steel rod. , (4) are temporary descent operation of the crane and Ps
Nut removal process on steel rod upper part, (5) crane raising operation and Ps steel rod main joining process, (6) crane lowering operation again, Ps steel rod upper nut temporary tightening process,
(7) is a diagram showing a step of removing the hanging jig from the PsPc column, respectively.

[0010]

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 PsPc pillar 5 Ps steel rod 5a Ps steel rod upper end male screw 11 Temporary tightening nut self-tightening device 12 Vertical hole 13 Round nut 14 Nut accommodating portion 15 Nut housing 16, 17 Ball 18, 19 Ball groove 22 Seat plate

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] May 12, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

[0002]

2. Description of the Related Art First, a construction example of conventional PcPs pillar erection work is shown in FIGS. 4 (1) to 4 (4) and 5 (5).
This will be described with reference to (7) . (1) First, the tower scaffold 2 is assembled close to the building position of the PcPs pillar 1. (2) Next, the through bolt 3 is passed through the upper portion of the PcPs pillar 1 placed on the floor, and the hanging jig 4 is attached thereto. In this PcPs pillar 1, a Ps steel rod 5 is penetrated through a sheath tube embedded in precast concrete, and when the PcPs pillar 1 is lifted to the male thread of the upper end of the Ps steel rod 5, P
A nut 6 is screwed in so that the steel rod 5 does not fall out. (3) Next, the hanging jig 4 is hung on the hanging wire of the crane to hang the PcPs pillar 1 on the existing pillar 7 such as a foundation pillar, and the main bar or Ps steel rod protruding from the upper end surface of the existing pillar 7. In the upper half of the screw joint 9 in which the lower half is screwed into the male thread of 8,
Turn the Ps steel rod 5 for introducing prestress coming out from the lower end of the cPs pillar 1 and screw the male screw of the lower end of the Ps steel rod 5 into the main bar of the existing pillar 7 or the Ps steel rod 8 of the PcPs pillar 1.
The steel rod 5 is temporarily joined. (4) Next, when the PcPs pillar 1 is lowered and the PcPs pillar 1 is deposited on the upper end surface of the existing pillar 7, the Ps steel rod 5 passed through the sheath tube is pushed up. Therefore, when removing the nut 6 for preventing the upper end of the Ps steel rod 5 from falling off and hoisting the PcPs pillar 1 in the next step, the upper end of the Ps steel rod 5 temporarily joined to the existing pillar 7 is the upper end surface of the PcPs pillar 1. Be able to withdraw from. This work is performed by a worker climbing on the tower scaffolding 2, transferring to the stigma of the PcPs pillar 1, and attaching a lifeline. (5) Next, the PcPs pillar 1 is lifted again to PcP.
At the bottom of the s pillar 1, the worker turns the Ps steel rod 5 to completely screw the male thread of the Ps steel rod 5 into the upper half of the screw joint 9, and the main bar of the existing pillar 7 or the PcPs pillar to the Ps steel rod 8. 1
The Ps steel rod 5 of No. 3 is permanently joined. During this time, the nut 6 on the stigma
The worker who removes the item returns to the tower scaffold 2 and waits with the lifeline attached. (6) Next, while the worker under the PcPs pillar 1 is adjusting the building of the PcPs pillar 1 using a transit etc., Pc
The Ps pillar 1 is hung on the upper end surface of the existing pillar 7. Turret Scaffold 2
Then, the worker who was waiting at moves to the pillar head of the PcPs pillar 1 again, and the nut 6 is screwed into the male screw on the upper part of the Ps steel rod 5 protruding from the upper end surface and temporarily tightened. (7) Next, the worker returns to the tower scaffold 2 from the PcPs pillar 1, leans out from the tower scaffold 2, and removes the hanging jig 4 and the through bolt 3 from the PcPs pillar 1. After this, a Pc beam and a half Pc slab are supported on the pillar head of the PcPs pillar 1, and the Ps steel rod 5
Introduce post tension to and pour slab concrete. Hereinafter, the above process is repeated on the upper part of the PcPs pillar 1 on the lower floor to proceed with the construction to the upper floor. In the erection of the PcPs pillar 1, it is possible to replace the tower scaffold 2 with a self-propelled lifting type table lifter to reduce the lifting labor of the worker to a high place, but in any case, (4) of the above process , (5),
Since (6) and (7) are work in which the worker climbs the PcPs pillar 1 or the tower scaffolding 2, improvement is required from the viewpoint of safety and workability of construction.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a temporary tightening nut self-weight tightening device according to the present invention.

FIG. 2 is a plan view of the temporary tightening nut self-weight tightening device.

3 (1) to (4) are views sequentially showing a construction method of erection work for precast / prestressed concrete columns using the temporary tightening nut self-weight tightening device according to the present invention in accordance with steps, (1) Attach the temporary tightening nut self-weight tightening device to the upper end surface of the PcPs pillar, and
The step of attaching the hanging jig to the upper part of the s pillar, (2) is Ps
Pc pillar is lifted, and P is added to the main bar of the existing pillar or Ps steel rod.
The step of permanently joining the lower part of the Ps steel rod of the cPs column, (3),
A process of descending while adjusting the PsPc column, and temporarily tightening the nut on the upper part of the Ps steel rod by the self-weight tightening device,
(4) is a diagram showing a step of removing the hanging jig from the PsPc column using a table lifter, respectively.

4 (1) to (4) are diagrams sequentially showing an example of construction of a conventional PsPc pillar erection work in accordance with steps, and (1) is
Turbine scaffold assembly step, (2) step of mounting a PsPc column suspension jig, (3) step of suspending a PsPc column, and temporarily joining a Ps steel rod of a PcPs column to a main bar of an existing column or a Ps steel rod. , (4) are temporary descent operation of the crane and Ps
It is the figure which showed the nut removal process of the steel rod upper part, respectively.

5 (5) to (7) are conventional PsPc pillar erection work.
It is the figure which showed the construction example of the thing one by one according to the process.
Crane raising operation and main joining process of Ps steel rod, (6)
[Fig. 6] is a diagram showing a descending operation of the crane again and a step of temporarily tightening the nut on the upper part of the Ps steel rod, and (7) is a step of removing the suspension jig from the PsPc column.

[Procedure 3]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

[Figure 5]

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hidetoshi Kuwahara 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation

Claims (2)

[Claims] 1. A vertical hole for loosely inserting a Ps steel rod for introducing prestress, and a nut storage portion for storing a round nut screwed with a male screw of the Ps steel rod concentrically with the vertical hole. A round nut is stored in the above-mentioned nut storage part of the nut housing, and the hemisphere of the ball is placed on each of the upper and lower planes of the nut storage part and the round nut that make contact with the nut storage part and the round nut, and the vertical surface in the circumferential direction. Form a circular ball groove in plan view where
A nut for holding the nut and a round nut in contact with each other through a large number of balls inserted in the ball groove, and a seat plate for mounting is fixed to the nut housing. apparatus. 2. A vertical hole for loosely inserting a Ps steel rod for introducing prestress, and a nut storage portion for storing a round nut screwed with a male screw of the Ps steel rod concentrically with the vertical hole. A round nut is stored in the above-mentioned nut storage part of the nut housing, and the hemisphere of the ball is placed on each of the upper and lower planes of the nut storage part and the round nut that make contact with the nut storage part and the round nut, and the vertical surface in the circumferential direction. Form a circular ball groove in plan view where
A precast and prestressed nut for temporarily tightening a self-tightening nut, which has a nut housing and a round nut in contact with each other through a large number of balls inserted in the ball groove, and a seat plate for fixing is fixed to a nut housing. Fix the upper end surface of the concrete column to the insertion position of the Ps steel rod, and
The male thread of the upper end of the steel rod is appropriately screwed into the round nut of the temporary tightening nut self-weight tightening device, and it is hung on the existing pillar that joins the precast / prestressed concrete pillar, and the lower end surface of the precast / prestressed concrete pillar The Ps steel rod from the main column is permanently joined to the main bar or Ps steel rod from the upper end surface of the existing column, and then the precast / prestressed concrete column is lowered to
By applying the weight of the prestressed concrete column to the temporary tightening nut self-tightening device, the vertical force that acts on the round nut is converted into the rotational force that goes down the thread slope of the male thread of the Ps steel rod, and it is automatically precast and prestressed concrete. A method of constructing a precast prestressed concrete column using a temporary tightening nut self-weight tightening device, characterized in that the upper part of a Ps steel rod of the pillar is temporarily tightened with a round nut of a temporary tightening nut self-weight tightening device.