JPH0781272B2 - Stress material installation method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for installing a stress material used for underground wall stop wall construction in the field of civil engineering and construction.

[Conventional technology]

Shaped steel such as H-section steel is often used as the stress material for the mountain retaining wall, but if there is a step in the underground structure or if the top end of the mountain retaining wall is to be lowered, the H-shaped steel 1 as the stress material is As shown in Fig. 7, the conventional GL (ground level) has been built, and then unnecessary parts are cut off according to excavation.

In the figure, 1 ', 1 "is an H-shaped steel as an ordinary mountain retaining wall.

[Problems to be solved by the invention]

In this way, even if the top end of the mountain retaining wall is lowered, the H-shaped steel 1 that hits the ground level as in the case of an ordinary mountain retaining wall has been hitherto used, so an H-shaped steel with an unnecessary length is used. They had no choice but to spend useless effort and materials.

An object of the present invention is to provide a method for installing a stress material, which eliminates the disadvantages of the conventional example, eliminates waste, improves workability, and significantly reduces cost.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention comprises a stress member made of H-shaped steel having a through hole for a pin near the upper end of the web, and an H-shaped steel similar to the stress member having a joint member integrally projecting at the lower end. Stick the ruler material and the upper part to the bottom web of the ruler material,
The lower part has a protruding part in which an insertion groove for the upper end web of the stress material is formed, and a through hole for a lateral pin that is orthogonal to the insertion groove is provided in the vicinity of the lower end of this protruding part, and a pin to be inserted into the through hole is provided. By using a joint member provided with a stopper portion that is detachably engaged, the through hole of the pin provided in the joint member and the through hole of the pin provided in the web of stress material are aligned with the insertion groove of the joint member. Insert the web of stress material into the through hole of the joint member and the through hole of the stress material by inserting a pin that can be pulled out by connecting it from the ground with a wire, etc., and detachably engage the pin with the stopper portion. Stop, connect the stress material and the ruler material through the joint member, and build up the connected stress material of the ruler material until the top of the ruler material reaches the ground level, and then the joint member Release the pin stopper and By pulling out the pin of the joint member by these operations, the connection between the stress material and the ruler material is released, only the ruler material is pulled up, and the pulled up ruler material with the joint member is used for the next building. It is a summary of what to do.

[Action]

According to the present invention, on the ground before building, the lower end of the ruler member is connected to the upper end of the stress member via the joint member,
In this connection, since the pin is inserted and the pin is locked by the stopper portion of the joint member to prevent the pin from coming off, safety can be achieved when hanging.

Then, the stress material having a required length is built up to a predetermined depth in the ground by a ruler material connected to the upper end of the stress material through a joint member, and the locking of the stopper portion to the pin is released. , By pulling the wire from the ground and pulling out the pin from the through hole of the stress material and the joint member, the stress material and the ruler material can be disconnected easily and smoothly without any trouble such as cutting. .

After installation, the stress material that will become the main pile will remain in the ground, and only the ruler material with joint members that is a temporary pile will be pulled up to the ground, and it can be diverted as it is without modification for the next construction. , You can eliminate waste.

〔Example〕

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 to 3 are front views showing each step of the installation method of the present invention.

First, the members used in the method of the present invention will be described. In the figure, reference numeral 2 is a stress member made of H-shaped steel, and through holes 3 for pins are provided in the web near the upper end. The length of the stress material 2 is determined as a mountain retaining wall with the top end lowered, like the H-shaped steel 1 after cutting and removal shown in FIG.

Reference numeral 4 in the drawing is a ruler material made of H-shaped steel having the same shape as the stress material 2 (the shape may be the same or slightly smaller), and a joint member 5 is provided at the lower end thereof.
Was integrally projected. This joint member 5 is shown in FIGS.
As shown in the figure, fix the upper part to the lower end web of the ruler material 4,
The lower part is projected, and the insertion groove 5a of the upper end web of the stress material 2 is formed on this protruding part. Further, a lateral through hole 7 orthogonal to the insertion groove 5a is formed in the vicinity of the lower end of the lower protruding portion of the joint member 5. Further, a guide pipe 9 is provided at the insertion opening of the pin 8 of the through hole 7.

On the other hand, the through hole 7 and the pin 8 inserted into the through hole 3
A groove is circumferentially formed at the tip of the.

On the joint member 5 side, a frame 11 is formed around the tip protruding portion after the pin 8 is inserted, and a locking piece 10 having a notch 10a that engages with the groove at the tip of the pin 8 is formed in the frame 11. A bar 10b is provided so as to protrude above the locking piece 10, a spring 20 is wound around the outer periphery of the bar 10b, and the frame 11 is used as a reaction force.
The stopper portion of the pin 8 is formed by urging the pin 10 downward.

The upper end of the bar 10b and the end of the pin 8 are connected to the ends of the operation wires 18 and 19 from the ground, respectively, and the guide pipe 9 is provided with a cleaning notch 9a for removing the dirt and sand that has entered the guide pipe 9. Formed.

The upper portion of the joint member 5 may be fixed to the ruler material 4 by welding, but in the present embodiment, an insertion groove 12 is formed similarly to the lower portion, and the lower end web of the ruler material 4 is inserted into the insertion groove 12 for bolting. Fix it with 13.

Next, the method of the present invention performed using the above members will be described.

On the ground before installation, the lower end of the ruler member 4 is connected to the upper end of the stress member 2 via the joint member 5. In this case, in the joint member 5, the pin 8 is inserted from the guide pipe 9 into the through hole 7, and the projecting end of the pin 8 on the opposite side is engaged with the locking piece 10 to prevent the pin 8 from coming off.

In this way, if the shackle 14 is attached to the upper end of the ruler material 4 and suspended by the wire 15 with a stand, the stress material 2 also hangs below it through the joint member 5, especially the pin 8, so that FIG. As shown, it is suspended in a hole 16 formed by an excavator such as an earth auger. Reference numeral 17 in the figure is a positioning ruler for such hanging, that is, for building.

At the time of installation, the upper end is guided to the ground by utilizing the space between the operation wires 18 and 19 and the flange of the ruler material 4.
As shown in FIG. 2, when the operation wire 18 is built up to a predetermined depth, if the operation wire 18 is pulled from the ground, the locking piece 10 is pulled up by the spring 20 and pulled out from the tip of the pin 8. further,
When the operating wire 19 is pulled, the pin 8 comes off.

In this state, if the ruler material 4 is lifted, only the stress material 2 remains as shown in FIG. 3, and the ruler material 4 and the joint member 5 that have been lifted are diverted to the next construction.

By attaching the suspension wire 21 (which may be a reinforcing bar or the like) to the upper end of the stress member 2, intermediate support in the hole 16 is also possible.

〔The invention's effect〕

As described above, the installation method of the stress material of the present invention can omit the useless portion of the shape steel that has been put in a portion that does not need to be inserted as in the conventional case when lowering the top end of the mountain stop wall, and The ruler material and the joint member are devised so that they can be easily attached and detached while ensuring safety at the time of installation, and moreover, the ruler material can be diverted to the next installation, so that cost reduction can be realized, and further, Since the complicated work of cutting while excavating is eliminated, the construction performance is improved.

Moreover, the stress member is firmly connected to the lower end of the ruler member through the joint member and the pin thereof, and the operation of removing the pin after it is built can be surely and easily performed by the operation wire and the spring.

[Brief description of drawings]

1 to 3 are front views of respective steps showing one embodiment of a stress material installation method of the present invention, FIG. 4 is a side view of a joint member, FIG. 5 is a front view of the same, and FIG. Same as the rear view, FIG. 7 is an explanatory view showing a conventional example. 1,1 ′, 1 ″ …… Type steel, 2 …… Stress material 3 …… Through hole, 4 …… Rule material 5 …… Joint member, 5a …… Insertion groove 7 …… Through hole, 8 …… Pin 9… … Guide pipe, 9a …… Notch for cleaning 10 …… Locking piece, 10a …… Notch 10b …… Bar, 11 …… Frame 12 …… Insertion groove, 13 …… Bolt 14 …… Shackle, 15 …… Wire with stand 16 …… hole, 17 …… positioning ruler 18,19 …… operation wire, 20 …… spring 21 …… hanging wire

Claims (1)

[Claims] 1. A stress member made of an H-shaped rope having a through hole for a pin near the upper end of the web, and a ruler member made of the same H-shaped rope as the stress member integrally projecting at the lower end. , The upper part is fixed to the lower end web of the ruler material, and the lower part has a protrusion formed with an insertion groove for the upper end web of the stress material, and a through hole for a lateral pin that is orthogonal to the insertion groove near the lower end of this protrusion. And a joint member provided with a stopper portion for removably locking a pin inserted into the through hole, the through hole of the pin and the stress material of the pin provided in the joint member in the insertion groove of the joint member. Insert the web of stress material so that the through holes of the pins provided on the web are aligned, and connect the through holes of this joint member and the through holes of the stress material with wires etc. from the ground to insert the pullable pins. , The pin is detachably locked by the stopper, and the stress material is The ruler material is connected via a joint member, and the stress material that connects the ruler material in this way is built until the top end of the ruler material reaches the ground level, and then the stopper portion of the pin of the joint member is released. At the same time, the pin of the joint member is pulled out by operation from the ground, the connection between the stress material and the ruler material is released, only the ruler material is pulled up, and the pulled up ruler material with the joint member is A stress material installation method characterized by being diverted to the end.