JPH01280124A - Pile device - Google Patents

Abstract

PURPOSE:To increase pile bearing force or pile drawing resistance force by fitting a cap material provided with reinforcing bars into a through hole provided to an appropriate position on the circumferential surface of a pile main body having a hollow section. CONSTITUTION:Under such a condition that a pile main body 2 formed by blocking up a through hole 3 with a cap material 6 is settled as required into the ground layer, concrete is filled into a hollow section 7 with pressure. The cap material 6 is pushed aslant into the ground layer downward by receiving the pressure of filling concrete. At that time, the cap material 6 breaks into the ground layer under such a condition that reinforcing bars 5 are led to the circumferential surface section of the through hole 3, and the cap material 6 stops under such a condition that an engagement section of the tip of the reinforcing bar 5 engages the circumferential edge section of the through hole 3.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is characterized in that the roots made of concrete reinforced with reinforcing bars extend from the peripheral surface of the pile like roots of a tree, thereby increasing the pile bearing capacity. Alternatively, the present invention relates to a mining equipment designed to significantly improve anti-pulling resistance.

(Prior art and problem to be solved by the invention) When the ground is soft and difficult to support the structure above, the load of the structure is transferred to the hard stratum through support piles that penetrate the soft stratum and reach the hard stratum. This construction method is generally adopted. In this construction method, the maximum length of the support piles is about 15 m, so if there is a strong stratum at a deep location, several support piles are successively connected to the ground! It is necessary to sink the support pile foundation into the If, which causes a problem of increasing the construction cost of the support pile foundation, and there is also a problem of poor work efficiency.

In addition, in the case of soft ground where there is no solid stratum below, the supporting force of the pile driven into the ground is mainly obtained from the frictional force generated between the soil and the surrounding surface of the pile. However, when relying on the supporting force due to such frictional force, it is necessary to lay a large number of piles side by side to prevent excessive settlement over a long period of time, which causes the same problem as with the support piles described above.

In addition, as a type of pile that uses frictional force to obtain pile-supporting force, there is also a flange-type pile, which has a flange protruding around the pile to improve the supporting force, but this does not hinder the sinking of the pile. In order to prevent this from occurring, the amount of protrusion of the jff 11 must be kept relatively small, and therefore there is a certain limit to the improvement of the pile supporting capacity by flanged piles.

The object of the present invention is to provide a mining equipment that can solve these problems.

(Means for Solving the Problems) In order to achieve the above object, the mining equipment 1 according to the present invention employs the following configuration.

That is, in the mining equipment 1 of the present invention, a through hole 3 is bored at an appropriate position on the circumferential surface of a pile base body 2 having an open upper end and a hollow portion 7 continuous in the length direction. The portion 16 is formed into a tapered shape and is closed from the outside by a cap member 6 that can be pushed into the ground layer by the pressure of filling concrete filled into the hollow portion 7 with pressure, and the base end portion of the cap member 6 is In addition, a reinforcing bar 5 is provided at its tip with an engaging portion 23 that protrudes into the hollow portion 7 and can engage with the inner peripheral edge 22 of the through hole 3 when the cap member 6 closes the through hole 3.
The device is characterized in that a suitable number of these are fixed at the proximal end portion 25 thereof.

Note that the through hole 3 should be formed outwardly so that a root-shaped portion 29 (to be described later) is formed downward when the mining equipment 1 of the present invention is used for the purpose of improving the pile supporting capacity. It is preferable to drill the hole so that the direction is inclined downward, and if the tunnel device l of the invention at the end of this article is used for the purpose of improving the anti-pulling resistance, the root-like portion 29 is formed facing upward. It is preferable to make the holes so that they are inclined outwardly and upwardly.

In addition, from the viewpoint of preventing pollution caused by vibration and noise, the mining equipment of the present invention is most preferably applied as a pile for the hollow construction method, in which the pile is sunk into a hole excavated with an earth drill, but it is also suitable for use as a driven type pile. Sometimes.

(Function) However, in a state where the pile base 2 with the through hole 3 closed by the cap member 6 is sunk in the ground layer 27 as required,
When the hollow part 7 is filled with concrete 30 under pressure,
The cap member 6 is pushed diagonally downward into the ground layer 27 under the pressure of the filled concrete, but at this time, the reinforcing bar 5 of the camp member 6 is pressed against the peripheral surface 13 of the through hole 3. The camping member 6 enters the ground layer 27 while being guided by the reinforcing bar 5, and stops when the engaging portion 23 at the tip of the reinforcing bar 5 engages with the inner circumferential edge 22 of the through hole 3.

Then, the hole formed by the intrusion of the cap member 6 is filled with concrete reinforced by the reinforcing bars 5. The root portion 29 made of reinforced concrete thus formed is formed as if a tree root extends from the through hole 3 portion of the sunken pile peripheral surface. The length of the root portion 29 varies depending on the condition of the ground layer in which the pile base 2 is deposited, the diameter of the pile base 2, etc., and may be, for example, about 30C11.

(Example) Embodiments of the present invention will be described below based on the drawings.

1 to 6, a mining equipment 1 according to the present invention is constructed by attaching a cap member 6 provided with reinforcing bars 5 to a through hole 3 provided at an appropriate position on the circumferential surface of a pile base 2.

The pile base 2 is formed, for example, as a concrete pile having a hollow part 7 that is open at the top and continuous in the length direction, and has a large-diameter outer circular hole 9 with a step lO in the peripheral surface part 8. A stepped through hole 3a, which is made up of a series of small-diameter inner circular holes 11, is bored outwardly and downwardly inclined. Note that the direction of inclination is preferably set to 45 degrees, for example.

Further, the drilling portion of the through-hole 3 is determined if the reinforcing bars 5 fixed to each cap member 6 do not intersect with each other when each through-hole 3 is closed with the cap member 6. , for example, as shown in FIG. 4, is arbitrary. In addition, lol
When the length of the I-strength reinforcement 5 is long, for example, as shown in FIG. 1, the through holes 3 in the circumferential direction are set in a staggered manner.

The camp member 6 has a tapered tip portion 16 and a peripheral edge portion 19 of the proximal end surface portion 17 at the tip of the cylindrical body 15 which is inserted through the through hole 3, so that the camp member 6 is in substantially close contact with the circumferential surface portion of the inner circular hole 11. A conical head 20 that can come into contact with the step 10 is arranged in a row at the center of its proximal end surface 17, and is manufactured, for example, as an integrally cast product.The cap member 6 has a conical shape. When the peripheral edge portion 19 of the base end surface portion 17 of the shaped head 20 is in contact with the step lO, the through hole 3 is closed (see Fig. 1), and when the pile base 2 is sunk into the ground layer, the through hole 3 is closed. This prevents soil from entering the hollow part 7. In this embodiment, the through hole 3 is formed as a stepped through hole 3a so that the head 20 of the cap member 6 can be accommodated within the outer circular hole 9 and the pile can be sunk more smoothly. It's for a reason. The inner circumferential surface 21 of the cylindrical body 15 of the cap member 6 has an inner circumferential edge 22 that protrudes into the hollow portion 7 when the cap member 6 closes the through hole 3.
An appropriate number of reinforcing bars 5 each having a retaining part 23 as a hook part at the tip thereof (see FIG. 3) form an annular shape at the proximal end part 25 of the reinforcing bar 5. It is fixed by means such as welding or screwing. In order to close the through hole 3 from the outside using the cap member 6 provided with the reinforcing bars 5, the entire reinforcing bars 5 are narrowed so that the engaging portion 23 does not come into contact with the through hole 3. The tip portions of the reinforcing bars 5 in the narrowed state are positioned in the hollow portion 7 through the through hole 3, and the head 20 of the cap member 6 is housed in the outer circular hole 9. In addition, if there is a possibility that the camping member 6 will come off the through hole 3 when sinking the pile, for example, as shown by the dashed line in FIG. The cap member 6 may be fixed to the outer peripheral portion of the proximal end of the cylindrical body 15, as shown in FIG.

When installing the tunnel device l having such a configuration in the ground layer 27 and forming the root-like portion 29 in a state where the roots of a tree extend from the through-hole drilling site of the pile peripheral surface 8, the tunnel device l is placed in the ground layer 27. After being deposited in the layer 27, the hollow portion 7 is filled with concrete 30 under pressure. To illustrate the concrete filling method, first, the hollow portion 7 of the pile base 2 is filled with concrete. Thereafter, as shown in FIG. 7, for example, the pile base 2 is secured by ensuring close contact of the joint 33 so that the cylinder opening 31 is in communication with the hollow upper end 32 of the pile base 2.
A cylinder 36 is placed on top, and the pile base 2 and cylinder 36 are integrated with a fixture 35, which will be described later. After that, a required amount of concrete 30 is poured into the cylinder 36 from the injection port until the required height of the cylinder 36 is reached, and the concrete 30 in the cylinder 36 is transferred to the hydraulic cylinder 37.
It is pressed by a piston 39 driven by.

Due to the pressing, the cap member 6 comprising the conical head 20
Under the pressure of the filling concrete, the reinforcing bars 5 penetrate into the ground IMi 27 in the direction of inclination of the through-hole 3 while forming a hole corresponding to the diameter of the base end of the head 20. A root-shaped portion 29 is formed which is wrapped with concrete of a required thickness. Note that if the roots are formed with the roots facing downward, there is a risk that the pile base 2 will float up due to the reaction caused by the penetration of the cap member in each through hole when the piston 39 presses. The pressing by the piston 39 is preferably carried out while pressing down the pile base 2 using the weight of a pile driver, for example, and the number of times concrete is poured into the cylinder 36, and therefore the number of times the piston 39 is pressed, depends on each perforation. The setting is such that a sufficient amount of concrete can be supplied to each through hole 30 to form a root-like portion 29 of a required length in the hole 3 portion. As shown in FIG. 7, for example, the fixing tool 33 fixes a locking ring 41 having a V-shaped groove 40 to the upper end portion of the resistor P, and also fixes a locking ring 41 having a V-shaped groove 40 at the tip end thereof.
The upper end of the connecting rod 42 that can be engaged with
By bolting the connecting rod 42 to the cylinder 36 while engaged with the groove 40, the joint 35 between the cylinder 36 and the pile base 2 can be tightly and integrally fixed.

FIG. 8 shows a case in which the pile base 2 is formed as a steel pile, and a state in which the proximal peripheral edge portion 19 of the head 20 of the camping member 6 is in partial contact with the outer peripheral edge of the through hole of the pile base 2. A cylindrical body 15 connected to the head 20 closes the through hole 3. The function of the device 1 constructed as above is the same as in the case of the above embodiment, but when the pile base 2 is made of steel in this way, corrosion of the pile base 2 is unavoidable. As shown in part in Fig. 9, each cap member 6.
... is pushed into the ground layer 27, and while the filling concrete is still soft, a vertically long reinforcing reinforcing bar 46 woven into a circular cylindrical shape, for example, is inserted into the hollow part 7 of the pile base 2 over the entire length of the hollow part 7. It is preferable to form a concrete wall portion 47 reinforced by the reinforcing reinforcing bars.

(Effects of the Invention) The mining equipment of the present invention has a structure in which a cap member provided with reinforcing bars is attached to a through hole provided at an appropriate location on the circumference of a pile base having a hollow portion, and as a result, the pile supporting capacity and pull-out resistance are increased. It is possible to significantly improve the abrasive force, reduce construction costs and improve work efficiency, and moreover, it can be manufactured at a relatively low cost as a structural element.

This will be explained in detail below according to the order of operation of the mining equipment of the present invention.

■ After the pile is sunk as required with the through hole closed by the cap member (when sinking the pile, the cap member in the closed state reliably prevents soil from entering the hollow part from the through hole). When the hollow part is filled with concrete under pressure, the reinforcing bars of the cap member are guided to the periphery of the hole by the concrete pressure applied to the camp member, and the cap member is automatically pushed into the ground layer as required.

Since the pushing of the camp member can be carried out in this simple manner without the need for special actuating devices or energy sources, the mining equipment according to the invention can be provided at a relatively low cost as a structural element. It is uruno.

■ In the hole formed by the intrusion of the cap member,
Since the reinforcement is reinforced by reinforcing bars and filled with concrete, a root-like part is formed from the perforated area of the sunken pile, resembling the roots of a tree, and the concrete is filled with concrete. Even in situations where the bottom end of the pile does not reach solid strata, it exhibits extremely large bearing capacity. Therefore, unlike conventional piles, many piles must be successively deposited until they reach a solid stratum, or a large number of friction piles must be sunk in groups (FJ friction piles are adopted as flange piles). However, there was a limit to the improvement of the supporting capacity by flanges, so the inconvenience of having to sink several flanged shafts was eliminated, reducing construction costs and improving work efficiency. It can be planned.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view showing an embodiment of a mining equipment according to the present invention constructed with a concrete pile base, and FIG. 2 is a perspective view showing a cap member with a reinforcing part together with a state in which it is attached to the pile base. Fig. 3 is a cross-sectional view showing the root-like part formed by the camp member with the reinforcing part, Fig. 4 is a cross-sectional view illustrating the manner in which through-holes are drilled in the pile base, and Fig. 5 is a cross-sectional view illustrating the manner in which through-holes are drilled in the pile base. A cross-sectional view explaining the action, Figure 6 is a cross-sectional view showing the roots extending from the peripheral surface of the pile like roots of a tree, and Figure 7 shows a concrete filling device that fills the hollow part of the pile base with concrete using pressure. A cross-sectional view, FIG. 8 is a partial cross-sectional view showing another embodiment of the present invention constructed with a steel pile base, and FIG.
The figure is a sectional view showing a reinforced concrete portion formed in the mine apparatus according to FIG. 8. 1... Pit equipment, 2... Pile base, 3... Through hole, 5...
... Reinforcement bar, 6... Cap member, 7... Hollow part,
23... Hoaibu.

Claims (1)

[Claims] A through hole 3 is bored at an appropriate location on the circumferential surface of the pile base 2 which has an open upper end and a hollow portion 7 continuous in the length direction, and the through hole 3 is formed by:
The distal end portion 16 is formed in a tapered shape and is closed from the outside by a cap member 6 that can be pushed into the ground layer by the pressure of the filling concrete filled into the hollow portion 7 with pressure, and the base end of the cap member 6 is An engaging portion 2 that protrudes into the hollow portion 7 and can engage with the inner peripheral edge 22 of the through hole 3 when the cap member 6 closes the through hole 3 is provided.
An appropriate number of reinforcing bars 5 with 3 at the tip are attached to the base end portion 2.
5. A resisting device characterized in that it is fixed at a point 5.