JPS58768B2 - pile support device - Google Patents

Description

[Detailed description of the invention] This invention relates to a pile support device.

In general, excavation and discharge of earth and sand etc. are performed using an excavator.
In the pile driving method, which involves inserting a reinforcing bar gauntlet into a pile hole with a predetermined diameter and depth, and then filling the pile hole with concrete to form the foundation pile, the standard length of the reinforcing bars is determined. In order to form long foundation piles that extend beyond the ground, a reinforcing bar gauntlet of a certain length is inserted into a pile hole that has been excavated to a predetermined depth one by one, with the upper part exposed to the ground surface. The lower end of the gauntlet to be inserted next is tied up with blast welding or wires while suspended by a crane, etc., and a reinforced gauntlet of the same length as the depth of the pile hole is installed inside the pile hole. After that, concrete was poured into the pile hole and filled to obtain a long foundation pile.

However, when forming long foundation piles using the above-mentioned construction method, there are cases where the site conditions are poor, that is, the ground is poor, making it impossible to excavate well-prepared pile holes, making it difficult to smoothly insert the reinforcing bar gauntlets, or when workers The reinforcing bar gauntlet 21 is inserted into the pile hole 20 when the reinforcing bar gag tube 21 is inserted into the pile hole 20 when the reinforcing bar gauntlet 20 is damaged due to a slight carelessness in inserting the reinforcing bar gauntlet 20, causing the hole wall to collapse and causing what is commonly called a mountain. is long, and the addition of the gauntlet tube is only strong enough to withstand explosion welding or bonding with wires, simply suspending the gauntlet tube into the pile hole, and it does not reach the bottom of the pile hole. When the suspension force was released for concrete pouring, the reinforcing bars themselves were deformed due to the axial load, etc., as shown in Figure 1, making it impossible to obtain the foundation pile as designed. .

Therefore, the present invention provides a support device consisting of a support ring formed to expand outward after the reinforcing bar cage is inserted into the pile hole at an appropriate position on the outer cylinder of the reinforcing bar cage. This invention is designed to prevent deformation of a reinforcing bar gauntlet inside a pile hole, and the present invention will be described below based on an embodiment shown in the drawings.

In Fig. 2, reference numeral 1 denotes a reinforcing bar casing having a certain length, and this reinforcing bar casing 1 is made up of several longitudinal bars 2 and a plurality of circular bars 3 connected at several points along its entire length. It has become.

Reference numeral 4 denotes a V-shaped leaf spring that is installed in plural pieces (four pieces in the drawing) around the outer periphery of several circular muscles 3, and as shown in FIG. The tip is slidably pivotally attached without being locked to the outer periphery of the plate spring 4, and the other end 4b is attached to a hole provided in the annular muscle 3, with the plate spring 4 being staked to its elasticity to form a flat plate. 5 and is locked by a pin 6.

7 is a support ring, and this support ring 7 has a plurality of split rings 8 (
The split rings 8 are partially wrapped 9 with each other, and by sliding this part to expand and contract the length of the circumference, the diameter can be expanded or contracted. It's Nishide.

Then, the inner circumferential surface of the split ring 8 forming the support ring 7 is connected to the apex 4c of the V-shaped leaf spring 4 installed on the annular muscle 3 with a rivet 10 or the like as shown in FIG. By holding the split ring 8 around the annular reinforcement 3, a support device 11 is formed on the outer periphery of the reinforcing bar cage tube 1.

In addition, the leaf spring 4 and the split ring 8 are attached to all the circular muscles 3.
Rather than installing it in the circular muscle 3, it is installed in some of the circular muscles 3.

In the above configuration, in order to form a foundation pile using the reinforcing bar cage 1 equipped with the support device 11 according to the present invention, first, an excavator is used to drill a pile hole having a predetermined diameter and depth at the point where the pile is to be installed. to drill.

A reinforcing bar cage cylinder 1 having a certain length and equipped with a support device 11 consisting of a support ring 7 is inserted into the pile hole.

At this time, the support ring 7 formed by the several split rings 8 presses the plurality of leaf springs 4 holding the split rings 8, and the end portion 4b of the leaf spring 4 is pressed against the annular muscle 3. By locking the hole 5 provided in the hole 5 with a pin 6, the diameter is kept in a reduced state.

Then, use an appropriate method to temporarily lock the rear end of the reinforcing steel barrel 1 on the ground so that it remains above the pile hole for an appropriate length, and then attach the next reinforcing steel barrel to a crane or the like, and weld it to the top of this locked cage barrel. Fix the lower part using a similar method, release the locking mentioned above, and insert it into the pile hole.

This process is then repeated until the length of the gauntlet is determined to correspond to the depth of the excavated hole.

When the reinforcing bar cage tube 1 can be vertically inserted into the center of the pile hole, the pin 6 that locks one end 4b of the leaf spring 4 to the hole 5 of the circular reinforcement 3 is pulled out.

The pin 6 is pulled out by strongly pulling the wire 12 attached to the pin 6 from above the pile hole.

Then, the split ring 8 supported by the leaf spring 4
As shown in the figure, the elasticity of the leaf spring 4 pushes the support ring 7 toward the outer periphery of the reinforcing bar cage 1, and the support ring 7 expands in diameter.

Therefore, the outer periphery of the support ring 7 comes into pressure contact with the inner cylindrical surface of the pile hole into which the reinforcing bar cage tube 1 is inserted, and holds the reinforcing bar cage tube 1 in a stable state within the pile hole.

In this way, by sequentially adding reinforcing bar cages 1 having a certain length to form a reinforcing bar cage having a predetermined length in a pile hole, the reinforcing bar cage tubes 1 can be attached to the axis of the reinforcing bar itself. The reinforcing bar gauntlet 1 can be inserted into a pile hole without causing troubles such as deformation due to directional loads.

Finally, by pouring concrete into the reinforcing bar cage tube of a predetermined length, a foundation pile as designed can be obtained.

Further, the support ring located on the outer periphery of the orbicularis muscle may have any other shape as long as its diameter can be expanded and contracted by a leaf spring.

As explained above, the present invention provides a method for forming a pile consisting of several longitudinal reinforcements and a plurality of circular reinforcements connected at several points along the entire length of the vertical reinforcements. When using the reinforcing steel gauntlet, a support ring that can be expanded in the direction of increasing the diameter by spring force is installed, so the reinforcing steel gauntlet can be inserted into the pile hole in a stable state without deforming, and it can be inserted as designed. foundation piles can be obtained reliably.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional front view showing a state in which a reinforcing bar canister is inserted into a pile hole by a conventional method, and Fig. 2A is a plan view showing a state in which a supporting device according to the present invention is attached to a reinforcing bar gag pipe. , second
Figure B is a front view thereof, Figure 3 is a partially enlarged sectional view showing the main part of the support ring when the support ring is expanded by the leaf spring of the support device according to the present invention, and Figure 4 is the support device in Figure 3. FIG. 5A is a plan view showing a state in which the support ring according to the present invention is expanded, and FIG. 5B is a front view thereof. 1...Reinforced gauntlet tube, 2...Vertical reinforcement, 3...
Quadribular muscle, 4... leaf spring, 5... hole,
6...pin, 1...curved support ring, 8...
Split ring, 11... surface support device.

Claims (1)

[Claims] 1 When using this reinforcing bar cage, a spring is attached to the outer cylinder of the reinforcing bar cage to form a pile consisting of several vertical bars and a plurality of circular bars connected at several points along the entire length of the vertical bars. A pile support device characterized by being equipped with a support ring that can be expanded in the direction of increasing the diameter by force.