JPH0230809A - Pile press-in apparatus - Google Patents

Abstract

PURPOSE:To secure the press-in force of piles and manage the execution of work ad facilitate the press-in of a plurality of the piles by arranging screw anchors on the periphery of a trestle, and by arranging a plurality of pile press-in oil-pressure jacks on the center movably in the mutually orthogonal direction within a horizontal surface. CONSTITUTION:In the front and rear and to the left and right of a trestle 5, screw anchors 7 are fitted, and on the center, on moving bases 13 which can be horizontally moved in the one direction, in the direction orthogonal to the moving direction of the moving bases 13, pile press-in oil-pressure cylinders 14 are movably set. Then, to the head sections of piles 3 driven previously near a bearing layer, the tresle 5 is moved by a crawler 4, and is fixed with the screw anchors 7 and after that, by the cylinders 14, the piles 3 are pressed-in. When there are a plurality of the piles 3, then the crawler 4 is moved to a proper position, and the movement of the respective cylinders 14 is regulated, and the cylinders 14 are exactly accommodated to the head sections of the respective piles 3 and they are pressed-in at the same time.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a press-fitting device for existing II foundation piles.

"Prior art 1. Problems to be solved by the invention" Generally,
The role of foundation piles is to penetrate the soft ground and support the weight of the structure on good quality ground. Therefore, during construction, the supporting capacity of each pile installed in the ground is checked, and the soundness of the antibodies and It is desirable for construction management to accurately judge the stopping depth.

By the way, the conventional method of confirming and managing the bearing capacity of piles is as follows:
For piles prepared on-site and piles embedded by enclosing the tip, after construction, after the concrete structure or the cementing liquid has hardened, a vertical loading test is performed on some representative piles, so the test It takes time and money to
Moreover, since the actual bearing capacity of piles other than the representative piles has not been confirmed, there is a drawback that it is not always possible to ensure the appropriate bearing capacity of all piles.

In addition, for driven piles, the amount of penetration is measured for each pile and the bearing capacity is checked using the dynamic bearing capacity calculation formula (pile driving formula), but the actual suitability of the calculation formula is (due to the conversion from dynamic to static) and construction pollution such as noise and vibration.

On the other hand, there is also a known method in which a fixed or self-propelled press-in structure equipped with a pile press-in jack is supported by screw anchors, and the piles are press-fitted by a static load by taking the weight of the structure and the reaction force on the anchor. Is there a limit to the weight of the body that can bear the burden?
There were problems such as not being able to expect a sufficient supporting reaction force, and also not being able to easily position and move the jack because it is fixed integrally.

"Means for Solving the Problems" In order to solve the above-mentioned conventional problems, the present invention has a plurality of hydraulic jacks for press-fitting piles in the center of the frame, each of which is movable independently in directions orthogonal to each other in a horizontal plane. As a pre-process, the crawler is moved to the approximate position above the head of the pile that has penetrated to the vicinity of the support layer, and then the hydraulic jack for pile press-in is moved to adjust the FA to accurately position the pile head. It can be attached and press-fitted on the part, and
A pile press-in system that makes it possible to press-in multiple piles that have been penetrated close together within the movement range of multiple hydraulic shirts at the same time without moving the crawler, and also makes it possible to press-in high-stop piles. This paper proposes a device.

In addition, the pressurizing reaction force of the hydraulic jack can be applied to multiple screw anchors that penetrate the ground according to the pressurizing force, which makes it possible to secure sufficient pile pressing force and to This paper proposes a pile press-fitting device that detects the pressurized load due to jacking at the same time as the full-scale construction of piles, making it possible to easily check the bearing capacity of the pile.

"Embodiments" Below, embodiments of the present invention shown in the drawings will be described.
First, as shown in Fig. 1 (a) and (b), as a pre-process, holes are drilled in the construction ground using a hole drilling machine such as an auger screw rod, and the required number of excavated holes 2 are made up to the vicinity of the support layer. ,
Ready-made piles 3 are erected one after another on this, and penetrated to the vicinity of the supporting layer using a pile driver.

Next, as shown in FIGS. 1(C) and 1(d), the inserted ready-made pile 3 is press-fitted by a pile press-fitting device shown in FIGS. 2-5.

This pile press-in device is equipped with a pedestal 5 that can be moved and moved by crawlers 4, and this pedestal 5 is installed so that its height can be adjusted freely by a height adjusting cylinder 6 that extends and contracts up and down.

The frame 5 is formed into a rectangular frame shape, and screw anchors 7 are attached to the front, rear, left and right sides of the periphery thereof. The screw anchor 7 is supported by a guide holder 10 attached to a bracket 8 provided on the frame 5 with bolts 9 and a gate-shaped frame 11 installed above the guide holder 10, and a rotating slide mechanism 12.
It is configured to move up and down while rotating.

At least two movable platforms 13 are provided in the central space of the pedestal 5, and each movable platform 13 is supported on both sides so as to move horizontally in one direction independently. Hydraulic cylinder for pile press-fitting that moves in the direction perpendicular to the direction
14 is installed, and a pressure cap 15 that can be fitted onto the head of the ready-made pile 3 is attached to the tip of the piston rod.

Each moving table 13 has nuts 16 provided at both ends thereof, as shown in FIG. 17 is rotated by a motor 19 via a sprocket chain 18 to move it forward and backward.

Each pile press-fitting hydraulic cylinder 14 is fitted with a pair of parallel feed screw shafts 21C which are rotatably supported on the movable base 13 by a nut 20 provided on its side surface, and this feed Connect the screw shaft 21 to the sprocket chain 22
It is configured to move forward and backward by being rotated by a motor 23 via.

Brackets 8 are also provided at other locations such as a part of the corner of the pedestal 5, for example, in order to maintain the balance of support reaction force according to the movement position of the hydraulic cylinder 14 for pile press-in, or to cope with an increase in applied load. Accordingly, the guide holder IO of the screw anchor 7 can be installed as appropriate.

In addition,! ! The height of the stand 5 can be adjusted using the height adjustment cylinder 6 according to the height of the head of the pile 3.As shown in Fig. 7, it is possible to adjust the height of the stand 5 depending on the height of the head of the pile 3. A pressurizing stand 24 is attached to an appropriate position on the outer periphery of the pedestal 5, and by means of a pile press-fitting hydraulic cylinder 14' attached to this, other ready-made piles 3 are normally penetrated so as to be able to pass under the bottom surface of the pedestal 5.
After that, the pedestal 5 is moved to the top of the pile to the same height as the pile press-fitting hydraulic cylinder 14 in the center of the pedestal 5.
Press fit.

The crawler frame 5 constructed as described above is moved over the heads of the ready-made piles 3 which have been penetrated and installed close to each other in advance, and each screw anchor 7 is actuated here to obtain the required pulling reaction force. Penetrates into the ground to a depth (approximately 10m).

In this state, each movable base 13 and each hydraulic cylinder for pile press-in are moved according to the positions of two adjacent ready-made piles 3 within the mutual movement range of each movable base 13 and each hydraulic cylinder 14.
14 is slide adjusted as appropriate to fit the pressurizing cap 16 to the pile cap, and then the hydraulic cylinder 14 is operated to press-fit the pile with a static press-fitting load (maximum of about 200 L) at the time of two screws.

The press-fitting loads at this time are sequentially detected and recorded as the construction date.

In addition, if there are two or more ready-made piles 3 within the mutual movement range of each moving table 13 and hydraulic cylinder 14, the press-fitting process can be continued in the same manner one after another at the same position, and the ready-made piles to be press-fitted in that range can be Even when the number of piles 3 is one piece, similar press-fitting can be performed using the hydraulic cylinder 14 of one of the movable platforms 13 depending on the position of the pile.

It is also possible to install two or more movable tables 13 and pile press-fitting hydraulic cylinders 14 to press-fit two or more ready-made piles 3 at the same time.

After installing the ready-made piles 3 in this way, each hydraulic cylinder 14 is used to apply 1 to 3 of the design bearing capacity to the head of each pile.
Load twice as much load for about 5 minutes and check the bearing capacity of each pile.

Thereafter, after pulling out the screw anchor 7, the crawler 4 is run to move the pedestal 5 onto another ready-made pile 3, and the same steps are sequentially performed.

"Effects of the Invention" As described above, according to the present invention, a crawler is moved over the head of the pile that has penetrated to the vicinity of the support layer in advance in the previous process, and a plurality of screw anchors installed around the crawler frame are moved around the pile. After penetrating the ground and supporting the pedestal, the pile is press-fitted into a hydraulic jack installed in the center of the pedestal, so the pressure reaction force of the hydraulic jack is applied to the multiple screws that penetrated into the ground. This makes it possible to secure sufficient pile pressing force, and at the same time as each pile is press-fitted, it is possible to detect the pressurized load due to jacking and check the actual bearing capacity of the pile. It can be confirmed reliably and easily, and perfect construction management can be performed for each pile.

Furthermore, by installing a plurality of hydraulic jacks for pile press-fitting in the center of the mount so that they can move freely in directions perpendicular to each other in a horizontal plane, the crawler can be moved to the approximate position above the head of the pile, and then multiple By adjusting the movement of the hydraulic jack for pile press-fitting on the stand, it is possible to accurately attach it to the heads of multiple piles and press-fit them at the same time. crawler
can be press-fitted continuously without moving, and the supporting force of each can be confirmed.

Attach pressure bases for high perch piles at designated locations around the pedestal,
A hydraulic cylinder for pile press-fitting is installed in this, so the pile is press-fitted in advance to the same height as other ready-made piles that have been successfully penetrated so that it can pass under the bottom of the pedestal, and then the pedestal is attached to the top of the pedestal. The pile can be moved to the top of the frame and press-fitted using the hydraulic cylinder for pile press-fitting in the center of the pedestal.

[Brief explanation of the drawing]

Figures 1 (a), (b), (C), and (d) are vertical sectional side views showing the construction process of the present invention, Figure 2 is a side view of the pile press-in device according to the present invention, and Figure 3 is the same. A front view, FIG. 4 is a plan view of the same, FIG. 5 is a plan view showing a moving mechanism of a pile press-in cylinder in a pile press-in device according to the present invention, FIG. 6 is a vertical side view of the same, and FIG. 7 is a high stop. It is a partial side view which shows the press-fitting aspect of a pile. ■...Drilling machine, 2...Drilling hole, 3...Ready-made pile 3' ・
High perch pile, 4... Crawler 5... Frame, 6... Height adjustment cylinder 7... Screw anchor, 8... Bracket 9... Bolt, 10... Guide holder it...
Frame, 12...Rotation slide mechanism 13...Moving table, 14.14° - Hydraulic cylinder for pile press-in 15...Pressure cap, 16...Nut. 17...Feed screw shaft, 18...Sprocket chain, 19...Motor, 20...Nut 21...Feed screw shaft, 22...Sprocket chain, 23...Motor, 24...Pressure table. Patent Applicant Nippon Concrete Industries Co., Ltd. Figure 6 Figure 5 Procedural Amendment (Method) September 11, 1999 Commissioner of the Japan Patent Office Yoshi 1) Indication of Moon Takeshi Case 1985 Patent Application No. 235285 Invention Relationship with the case of the person amending the name of the pile press-in device Patent applicant Nippon Concrete Industry Co., Ltd.

Claims (1)

[Scope of Claims] 1) A plurality of screw anchors are equipped around a frame that can be freely moved by crawlers, and a plurality of hydraulic jacks for press-fitting piles are installed in the center of the frame independently in the front, rear, left, and right directions in a horizontal plane. A pile press-in device characterized by being installed in a movable manner. 2) A plurality of screw anchors are installed around a pedestal that can be moved freely by crawlers, and a plurality of hydraulic jacks for pile press-in are installed in the center of the pedestal, each movable independently in the front, rear, left, and right directions in a horizontal plane; A pile press-fitting device, characterized in that a pressurizing stand for high-end piles is attached to a predetermined location around the pedestal, and a hydraulic cylinder for pile press-fitting is installed thereon.