JPH0270822A - Temporary post erection method and device - Google Patents

Abstract

PURPOSE:To increase the degree of accuracy of erection and to promote efficiency, energy saving and security by screwing and inserting a temporary post loaded with a temporary stopping holder and cap nut and a connection bar steel provided with a screw section and using a pliers having a guide member. CONSTITUTION:Concrete 2 is placed to the bottom of a temporary post erecting hole 1, installing a holder (A) having a vertical and horizontal erecting position adjustment crosspiece on the ground surface, hanging a temporary post (B) loaded with a cap nut on the surface thereof in the hole 1, and it is held temporarily to the holder (A). After that, a pliers (C) is hung on the temporary post (B) through a guide member 12 vertically provided to the lower end thereof, and a connection bar steel (D) to be screwed and inserted to the upper end surface of the pliers from a connection bar steel insertion hole of the top of the pliers (C) is screwed to connect the temporary post (B) to the pliers (C) vertically through the screw section and cap nut. The temporary post (B) is inserted to the concrete 2, and after hardening, the pliers (C) is removed and eliminated, then the erection of the temporary post (B) is completed.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is a method for erecting temporary struts for supporting the upper short body into excavated holes underground in the reverse casting method, which is one of the underground construction methods. This relates to the method and equipment for constructing pillars.

(Prior Art) Figures 15A to 15E show the steps of the conventional temporary support construction method, in which a temporary support installation frame (b) is installed on the ground facing the temporary support installation hole (a), Set the head support ((1) of the guide square steel pipe (C) at a predetermined position, and pour concrete (e) into the construction hole (a) at a predetermined height. (See Figure 15A) In the figure, (f) is a casing pipe.

Next, install a temporary support (h) with a spacer (barrel attached) so as to reduce the clearance with the guide steel pipe (C) (see Figures 15B, 16, and 17). is suspended and connected to the temporary support (h) with bolts (j), and the temporary support (h) is placed on the frame (b). (See Figure 15C) Furthermore, use the vertical accuracy adjustment jack (k) to check the verticality of the guide square steel pipe (C) (see Figure 16) and install the temporary support (
h) together with Yatsutoko (i) and the square guide tube (C).
Using as a guide, suspend the temporary support (h) into the uncured concrete (e) and insert it into the uncured concrete (e). (See Figure 15D) A worker enters the construction hole (a) using the temporary support (h).
Remove the connecting bolt 0) between the robot (i) and the robot (i), and complete the series of operations. (15th E
(See figure) (Problem to be solved by the invention) In the conventional construction method described above, when one head of a temporary support is located and there are many types of bells, a large number of bells are required depending on the height, resulting in high costs. Become.

In addition, since the vertical accuracy of the short guide steel pipe determines the overall erection accuracy including the temporary support, there is a problem with the erection accuracy.

Furthermore, it is dangerous because a worker enters the temporary support installation hole and removes the connecting bolt between the temporary support and the support, and furthermore, it takes a lot of time to connect and remove the support and the temporary support.

The present invention has been proposed in view of the problems of the prior art described above, and its purpose is to achieve high construction accuracy, high efficiency, labor saving, and improved safety. The purpose of this invention is to provide a method and equipment for constructing pillars.

(Means for Solving the Problems) In order to achieve the above object, the temporary support construction method according to the present invention involves excavating a temporary support installation hole in the ground, and pouring concrete at the bottom of the hole. A pedestal is installed on the ground facing the construction hole, and then a temporary support with a cap nut attached to the surface of the member is suspended into the construction hole, temporarily supported by the pedestal, and then a threaded portion is attached to the lower end. A rod having a connection bar having the same structure is screwed vertically from the upper end surface, and a guide member that slidably contacts the temporary support is hung at the lower end of the rod, and the rod is suspended over the temporary support using the guide member as a guide. As you lower it,
Turn the connecting steel bar from the upper end and screw the lower end threaded part into the cap nut of the temporary support, then suspend the rod and temporary support into the construction hole and insert it into the unhardened concrete at the bottom of the hole. The temporary support is inserted into the concrete, and then, after the concrete has hardened, the connecting screw is screwed in the opposite direction to release the screw from the cap nut, and the rod is lifted up and removed. It is.

Further, the temporary support installation device according to the present invention includes a temporary support mount installed on the ground surface facing the temporary support installation hole, a temporary support with a cap nut mounted on the surface of the member, and a lower end portion of the temporary support support. A connecting steel bar having a threaded portion that is screwed onto the cap nut is screwed vertically from the upper end surface, and a guide member that slidably contacts the temporary support is provided vertically at the lower end. has been done.

In order to improve the construction accuracy of the temporary support, horizontal members for adjusting the position of the temporary support in the X and Y directions, which are horizontally movable in the X and Y directions perpendicular to each other, are mounted on the frame. .

Further, on the top of the rod, a piece for fixing the connecting rod is provided, which has a connecting rod insertion hole drilled at a symmetrical position of the axis.

Further, the upper end of the connecting bar is provided with a screw portion for screwing a fixing nut into the fixing piece of the rod and a locking portion for a tool for rotating the connecting bar.

(Function) As described above, in the present invention, a frame is installed on the ground facing the temporary support installation hole, and a temporary support with a cap nut mounted on the member surface is suspended into the installation hole. Temporarily supported on the pedestal, and suspended from the temporary support via a guide member that is suspended from the lower end and slidably contacts the temporary support;
The temporary support is connected to the support exactly perpendicularly by screwing a connecting steel bar screwed vertically into the upper end surface of the support and screwing it into the hollow nut 1- installed on the surface of the member of the temporary support. be done.

In this state, the above-mentioned Yatsutoko and temporary support are suspended into the construction hole, the temporary support is inserted into the unhardened concrete at the bottom of the hole, and after the concrete hardens, the temporary support is inserted into the construction hole. Fix it.

After that, the connecting steel rod is rotated from the top of the rod in the opposite direction to the previous direction, and the connecting steel rod is removed from the cap nut to release the connection between the rod and the temporary support, and only the rod is removed. It will be hoisted up and removed, and the erection of temporary supports for the construction hole will be completed.

(Example) The present invention will be described below with reference to the illustrated embodiments.

Drill a temporary support installation hole (1) in the ground, pour concrete (2) at the bottom of the circumference (+), and install a frame for temporary support installation on the ground facing the construction hole (1). Install (A).

(See Figure 1A) (3) in the figure is the casing.

As shown in Figs. 2 and 3, the pedestal (A) has pedestal level adjustment jacks (4) mounted on its legs, and a horizontal member (5) for adjusting the construction position in the X direction on its upper part. is installed so as to be movable horizontally in the X direction, and a horizontal member (6) for adjusting the construction position in the X direction is installed on the horizontal member (5) so as to be freely movable horizontally in the X direction. .

After adjusting the level of the pedestal (A) using the jack (4), move and adjust the horizontal members (5) and (6) for adjusting the construction position in the X and Y directions so that they are aligned with the center axis of the frame. Fix it at an x and y position that is slightly larger than 1/2 of the cross section.

Next, a temporary support (B) made of H-beam steel is placed into the horizontal members (5) and (6) by a crane, so that the head part of the horizontal member (5) and (6)
), and as shown in Figures 4 and 5, insert the hairpin bar (8) into the through hole (7) provided in the web to engage the horizontal member (6). and temporarily fix the temporary support (B) to the pedestal (A). (See Figure 1B) The temporary support (B) has a point symmetrical position with respect to the axis.
A cap nut (9) is welded to a portion corresponding to a connecting steel bar mounted on the shaft, which will be described later.

(See Figures 4 and 5) Next, hang the Yatsutoko (C) onto the temporary support (B).

The same rod (C) is made of H-beam steel with the same cross section as the temporary support (B), and the connection bar fixing piece ( 11
) are welded, and guide members 02) made of grooved steel are vertically installed on both sides of the web to slidably contact the flange surfaces of the temporary struts (B). ing. (See Figures 6 to 9) The surface in the figure is a hanging hook.

Then, the connecting steel bar fixing piece (1
A connecting rod CD) is inserted into the connecting rod insertion hole 00) of 1) and fixed to the piece (11).

The connecting steel bar (D) is provided with a lower end screw portion 04 for screwing into the cap nut (9) at the lower end, and an upper screw portion fixed to the piece (11) via two support nuts θ. A portion θ0 is provided, and a locking portion Q'7) for a rotary tool such as a spanner is provided at the upper end portion. The side in the figure is the washer. (Figures 1O to 12
(See figure) The rod (C) on which the connecting steel bar (D) is mounted is guided by the guide member (12), suspended on the temporary support (B), and rotates the connecting steel bar (D). Then, screw the lower end threaded part 04 into the cap nut (9) of the temporary support (B), tighten the upper threaded part 0ω of the connecting rod 1 (D) with the support nut 0ω, and attach the connecting bar fixing piece (11). By fixing it to , the support (C) and the temporary support (B) are precisely connected vertically. (See Figure 1C and Figure 6 11q) At this time, measure the level of the pedestal (A) in advance, and use the support nut 0ω to ensure that the top of the temporary support (B) is at a predetermined height. Adjust the length of the connecting rod 11n(n) in advance.

After joining the Yatsutoko (C) and the temporary support (B) in this way, they were both hoisted up by a crane and the hairpin 1ii
1 (8) is isolated above the horizontal member (6) on the frame (^) and removed, and then suspended until the head of the robot (C) comes into contact with the horizontal member (6). Pillar (
B) is inserted into uncured concrete (2).

(See Figure 1D) When the concrete hardens, the above-mentioned connecting steel bar (D) is removed from the cap nut (9) by screwing it in the opposite direction using a spanner at the above-ground level. ) (see Figure 1E) and install the pedestal (8) at the next location, and reuse the holder (C).

(Effects of the Invention) According to the present invention, a cap nut is attached to the temporary support, a connecting bar having a lower end threaded portion that is screwed into the cap nut is vertically screwed into the top of the pole, and the pole is hung down at the bottom. Using the guide member as a guide, the temporary support is suspended in the temporary support installation hole and suspended onto the temporary support that is temporarily supported by the frame, and the connecting steel bar is screwed to screw the lower end threaded portion into the cap nut. The installation accuracy is good because the temporary support is suspended through the steel bar connected to the I/C and then hung into the temporary support installation hole.

When the construction of the temporary support is completed, the connecting steel bar is screwed in the opposite direction from the E section of the Yatsutoko and removed from the cap nut.
Since the Yatsutoko is lifted and removed, there is no need to enter the temporary support installation hole, making it safer. Connection and disassembly of the Yatsutoko and the temporary support only requires rotating the connecting steel bar at the top of the Yatsutoko. , easy to work and high efficiency.

Furthermore, according to the present invention, only one Yatsutoko can be produced.
It is extremely economical because it is only necessary to manufacture several types of connecting steel bars.

The invention according to claim 2 is characterized in that the above-mentioned frame, a temporary support having a cap nut mounted on the surface of the member, and a connecting steel bar having a screw portion for screwing the cap nut at the lower end are screwed vertically from the upper end, and from the lower part. The temporary support construction method can be carried out efficiently by configuring a temporary support installation device with a guide member vertically attached to the temporary support that makes dynamic contact with the temporary support.

The invention according to claim 3 is characterized in that the column center position of the temporary support is adjusted by mounting horizontal members for adjusting the position of the temporary support in the X and Y directions, which are horizontally movable in the X and X directions perpendicular to each other. can be determined accurately.

According to the fourth aspect of the invention, a connection bar fixing piece having a connection bar insertion hole drilled at a position symmetrical to the axis is disposed on the top of the rod, so that the same t! The temporary support can be accurately suspended vertically from the above-mentioned rod via the connecting steel bar.

The invention according to claim 5 provides an upper end of the connecting bar with an upper screw portion for screwing a support nut onto the fixing piece of the yutoko, and a locking portion of a tool for rotating the connecting bar.
This makes it easy to connect the temporary support to the YATSUTOKO by screwing the connecting steel bar, and to easily perform dismantling work.

[Brief explanation of the drawing]

Figures 1A to 1E are vertical sectional views showing a first embodiment of the temporary support construction method according to the present invention, Figures 2 and 3 are a front view of the frame, a plan view, and 5 and 5 are respectively partial front views and plan views of the temporary support, FIG. 6 is a front view showing the joint between the Yatsutoko and the temporary support, FIG. 7 is a plan view of the Yatsutoko, and FIG. 8 is its part. Side view, Figure 9 is taken from arrow IX in Figure 6.
Figures -IX, 1θ, and 11 are the front and bottom views of the connecting steel bar, respectively, and Figures 13 and 14 are longitudinal cross-sections showing the set portion of the rod in the frame, respectively. Figures 15A to 15E are vertical cross-sectional views showing the steps of the conventional temporary support construction method, Figure 16 is a vertical cross-sectional view showing the setting part of the support for the frame in the conventional construction method, and Figure 17 is the plan view. 16 is a view taken along arrows X■-X■ in FIG. 16. (A) - Frame (B) - Temporary support (C)
・-Yatsutoko (D)--Connection bar (]]l-
- Large temporary support hole (2) - Concrete (5) - X
Horizontal frame member (6) for adjusting the erection position in the Y direction - Horizontal frame member (9) for adjusting the erection position in the Y direction - Cap nut (lll) - Connection bar insertion hole (11) - Bead 0 for fixing the connection steel bar Guide member Q4) - Lower end threaded part of the connecting bar θ - Nut 0 ω - Upper threaded part of the connecting bar 0 force - Agent for the rotating tool section Patent attorney Shige Okamoto 2 people outside the text Shoulder 4 Rigidity 11 Prisoner Wei 13th District

Claims (5)

[Claims] (1) A temporary support installation hole was excavated in the ground, concrete was poured at the bottom of the hole, a frame was installed on the ground facing the construction hole, and cap nuts were then installed on the surface of the member. A temporary support is suspended into the construction hole and temporarily supported on the frame, and then a connecting steel bar having a threaded portion at the lower end is screwed vertically from the upper end surface, and a lower end is slidably attached to the temporary support. Suspend the rod on which a guide member that comes into contact with is suspended above the temporary support using the guide member as a guide,
The connecting steel bar is screwed from the upper end, and its lower end threaded part is screwed into the cap nut of the temporary support, and then the rod and the temporary support are suspended in the construction hole and inserted into the unhardened concrete at the bottom of the hole. The temporary support is inserted into the concrete, and then, after the concrete has hardened, the connection screw is screwed in the opposite direction to release the screw connection with the cap nut, and the support is lifted up and removed. Pillar construction method. (2) A temporary support frame installed on the ground facing the temporary support installation hole, a temporary support with a cap nut mounted on the member surface, and a screw screwed into the cap nut at the lower end. A temporary support structure characterized in that a connecting steel bar having a section is screwed vertically from an upper end surface, and a guide member is suspended from a lower end portion to slidably contact the temporary support support. Device. (3) The temporary support erecting device according to claim 2, wherein horizontal members for adjusting the position of the temporary support in the X and Y directions, which are horizontally movable in the X and Y directions perpendicular to each other, are mounted on the frame. . (4) The temporary support erecting device according to claim 2, wherein a connecting rod fixing piece having connecting rod insertion holes drilled at symmetrical positions of the axis is disposed on the top of the rod. (5) The temporary support erecting device according to claim 2, wherein the upper end of the connecting bar is provided with a threaded portion for screwing a support nut into the fixing piece in the rod and a locking portion for a tool for rotating the connecting bar.