JPH11166231A - Bottom widening existing pile and embedding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To strengthen support force by releasing engaging of a bottom widening existing pile and a boring case and lifting the boring case after charging the bottom widening existing pile in the boring case, and rotating the boring case to be inserted in the ground. SOLUTION: A speed reducer for rotation 12 charged in the upper part of a boring case 5 is hung by a wire extending from a winch 17 mounted on a leader for shield machine lifting and lowering 13 via the pulley of the leader 13. A circular bottom board 2 provided with an excavation blade 3 on the lower face is provided on the edge of a straight axis pipe 1 to form a bottom widening existing pile, which is charged in the boring case 5. When the boring case 5 is rotated, a wire is simultaneously made free, and the boring case 5 is lowered in the ground. Furthermore, after the boring case 5 reaches prescribed depth, the boring case 5 is reversely rotated, when the wire is wound by a winch 17, engagement of the boring case 5 and a bottom board 2 is released, and the boring case 5 is lifted as the bottom widening existing pile is left in the ground, thereby enhancing support force.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION A foundation pile according to the present invention is a prefabricated prefabricated pile for a building foundation to be buried by determining the depth of a straight axis after examining the strength of a supporting ground layer, and is lightweight and strong. Still, it is possible to reliably build a low-cost pile with excellent workability according to the purpose, in particular, foundations of small-scale buildings targeting soft ground, foundations for retaining soil or foundations on the seabed, Other anchor piles are extremely effective piles that are strong in pulling force as well as supporting force. In addition, sloping piles can be buried by burying the excavator, and straight shafts are reinforced. In order to do this, concrete or reinforced concrete may be cast in the straight shaft pipe as necessary.Furthermore, rainwater is formed by drilling multiple holes in the straight shaft pipe and superimposing it with the permeable material pipe and burying it. It becomes a water-permeable pile that penetrates and reduces in the soil. The or groundwater relates extremely effective 拡底 prefabricated pile with embedded machine etc. can be applied to liquefaction prevention piles jetting on the ground separately from the sand.

[0002]

2. Description of the Related Art In recent years, the number of opportunities for constructing buildings on soft ground has increased, and this has led to problems caused by uneven settlement of small-scale buildings such as houses. There are a variety of foundation methods to perform, and it is difficult to list them here. However, construction costs are relatively low and the construction method is relatively easy. .

[0003] A soil-cement column foundation or the like is to form cement into a column by injecting cement milk into a formation ground and stirring and mixing with the soil. Investigation of properties is necessary, and if the mixing and mixing of soil and cement are not performed uniformly, there will be problems such as differences in the manifestation of pile strength.Therefore, various problems such as careful attention to construction management are required. There is also a point.Also, pre-formed spiral piles with spiral collars on steel piles are known as friction resistance, but the cost of the pile itself is high and it is said that it is less adaptable except for special sites. I have.

[0004]

SUMMARY OF THE INVENTION The present invention has been developed as a foundation pile for preventing obstacles due to uneven settlement of a small-scale building and the like. Conventionally, there has been no construction method of burying an expanded pile, which is an extremely wide pile with a bottom slab. It relates to a burial machine that burials without applying rotational stress to the shaft,

Conventionally, a pile foundation is formed by driving a pile to the supporting ground in order to use a supporting ground existing in a deep part as a foundation of a structure. However, no problem occurs with any type of pile foundation.However, in the case of soft ground with thick continuous piles, the pile supporting capacity is generally increased by group piles or on-site expanded piles due to friction. I'm trying to make it happen.

Conventionally, in the soil cement column method of the generally used method, as described above, the foundation column is created by injecting and stirring the cement milk into the soil at the site. It is necessary to carry out an investigation on its own.Also, even if confirmation of the strength, shape, etc. of the created piles, problems may occur if the construction management is not sufficient. Prefabricated expanded piles are manufactured in a firm and accurate shape at the factory, so it is possible to embed piles of material that can be sufficiently guaranteed against the age of the material. Since the pile has a small cross-sectional area, it is characterized in that it is an economical pile that is stable, lightweight, and stable over a long period of time.

The prefabricated pile according to the present invention is characterized in that the cross-sectional area of the straight shaft and the area ratio of the bottom slab are increased to reduce the weight of the pile itself, eliminate waste of material, and provide a strong prefabricated pile with high pull-out force. In addition, the excavator burial machine with a steel brim for burying an existing pile with an expanded bottom is an optional type that can be used by attaching it to the end of an arm such as a shovel of a conventional general-purpose heavy machine. Insert the straight shaft part of the prefabricated bottom pile into the case of the excavator with steel collar, and install the steel cap attached to the tip of the straight shaft and the electromagnetic plate magnetically attached to and support the tip inside the case The steel cap at the end of the straight shaft is fixed to the straight shaft with bolts, etc., so that the pile is buried when the heavy equipment is moved. be able to.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention achieves mass production and low production by using a light and hard ceramic material as a circular plate instead of a steel plate as a bottom plate in soft ground. The bottom plate excavation surface is provided with a groove for inserting a steel flat plate excavation blade, and a circular projection that covers the straight pipe and fixes it with connecting bolts is integrated with the bottom plate at the center of the bottom plate upper surface. The merit as a ceramic molded product is great, for example, it can be molded with.The shape of the excavation blade which is suitable for excavating the gravel etc. Although there is room for studying the material of the slab and the bottom slab, a commercially available steel pipe or hard PVC pipe is generally used for the straight shaft suitable for soft ground, and concrete or reinforced concrete is filled in the straight shaft pipe. Need pile reinforcement In this case, use a thick pipe that can withstand the earth pressure after embedding.There is no problem if the structural strength satisfies the design value even if the straight shaft and the expanded bottom are made of different materials. If the straight shaft portion and the expanded bottom portion are divided into parts and the assembling method is simple, it is efficient and economical to carry out assembling individual parts after assembling them, including handling and transportation.

A method of burying a pile in which a plurality of hooking grooves provided at the end of a digging case with a collar and a hookable projection provided on a pile bottom slab engage with each other and excavate is described by the author. This is the same as the method described in Utility Model Registration No. 1998247, which was acquired on December 22, 1993, the name of the device, "spiral pile".

In order to embed a prefabricated pile with the above-described configuration, the straight shaft portion is loaded into an excavator case, the laying machine is moved to the embedding position, and the excavator is set at a predetermined angle. When the upper reducer is rotated, the excavator descends into the soil along the excavator support leader by its own weight and the thrust of the brim, and when it reaches a predetermined position, the excavator is rotated reversely and provided at the tip of the support leader The wire hanging from the excavator via the pulley is wound up by a winch mounted on a heavy machine or a leader. According to the above-mentioned embedding method, the excavation rotation load is not applied to the straight shaft portion of the expanded pile, and the stratum is formed. It can be buried to a predetermined depth without touching.

The excavator can be an optional type in which a tip of an arm such as a hydraulic shovel of a general-purpose heavy equipment is connected to a bracket provided on an excavator support leader by a pin or the like. It is only necessary to provide about 3 to 4 steps from the lower end of the excavation case so as not to excavate earth and sand during excavation on the ground.

[0012] The prefabricated expanded pile is a small-scale building for soft ground in which the ratio of the cross-sectional area between the direct axis and the expanded section can be changed within a range designed in consideration of the bending stress applied to the direct axis. The cross-sectional area ratio between the bottom plate and the straight shaft can be set in the range of 4 to 6 times for products, etc. In addition, the material of the straight shaft and the bottom plate portion is changed because the straight shaft and the expanded bottom portion are manufactured separately. It is possible to make low-cost, expanded bottom piles based on design values according to the strength of the ground, such as making the excavation blade on the excavation surface made of steel and the bottom slab made of a molded product such as ceramic. The excavation machine for burying existing piles can be used by partially improving the tip of the arm of heavy equipment such as a general-purpose hydraulic excavator. 5
Since a small turning work is required in about m, a small hydraulic shovel is used. In the case of a long pile of about 10 m, a drill dedicated machine, a power splitter, or the like can be used as a heavy equipment for mounting.

According to a second aspect of the present invention, there is provided a pile formed of a water-permeable pipe having an expanded bottom and having a straight shaft formed of a steel pipe or a rigid PVC pipe and provided with a plurality of water holes, a pit for a gutter or a dedicated pit. In the above, buried prefabricated piles of water-permeable pipes are buried to collect rainwater and return it to the underground.Also, in the event of an earthquake, pore water and groundwater in the stratum are separated from sediment and spouted to the ground via a straight pipe. To form a permeable pipe for preventing liquefaction.

In the case of a foundation pile for a retaining wall, a method in which a retaining wall column is erected in a straight pipe and concrete or reinforced concrete is cast and fixed is employed, so that the bending strength of the column and the expanded foundation is integrated. It becomes a very effective pillar pile that is strong against pulling out, and the excavator has an inclination angle of about 1
It is characterized by the fact that it becomes possible to bury slanted piles by excavating in the 5 ゜ range.

[0015]

According to the present invention, by embedding an expanded bottom pile in which the lower end portion of the pile is enlarged, it is possible to provide a pile that is lightweight, has a strong supporting force, and also has a strong pulling force. Since this prefabricated pile can be buried in the soil without giving a rotating force to the straight shaft at the time of burying, the cross section of the straight shaft will not be unnecessarily thick. The area of the bottom slab can be made up to 5 to 6 times as large as the shaft. Also, because of the expanded bottom, it becomes a pile that is strong for pulling out, and if the piles at the top of the pile are connected with strong beams, damage such as uneven settlement will occur Can be reduced. In addition, by integrating with the support for the retaining wall of the developed land, a structure that is strong against falling can be made.

[0016] In order to produce parts with the straight shaft portion and the expanded bottom portion separated, the material and shape of the bottom plate and the straight shaft can be selected and determined according to the properties of the soil and the ground strength. The shaft can be made of commercially available steel pipe, hard PVC pipe or molded steel, etc., and the purpose can be achieved by placing reinforced concrete in the pipe if necessary. By doing so, it is possible to reduce weight and mass production and reduce costs.As mentioned above, since all products are manufactured at the factory, strength and shape according to design values such as the area of the bottom plate and the strength of the straight axis When used as short piles (5-6 m) on soft ground where products can be obtained, the excavator is installed by partially improving the arm tip of a small hydraulic shovel or the like of a general-purpose heavy machine. An easy way you can take a small rule Maneuverability workability is improved effectiveness in construction area, also 拡底 established Pile wherein like natural undulations is effective as a stable foundation piles left intact.

A permeable material pipe buried with a certain gap between the straight shaft and the inner diameter of the excavating case, which is sized to match this gap, is superimposed on a straight shaft having a plurality of holes to allow rainwater to penetrate underground. A prefabricated pile that can be used as a permeable pipe, or as a liquefaction prevention pipe that separates underground pore water and groundwater during an earthquake from earth and sand and gushes it to the ground.

In the prefabricated pile according to the present invention, the construction method is established within a range where the length of the excavating case is allowed in consideration of the strength of the bottom plate and the shape and material of the excavating blade. The present invention provides an effective wide-spread prefabricated pile with a wide application range, such as being applied to civil engineering works.

[0019]

FIG. 1 is an enlarged bottom prefabricated pile having a ceramic circular bottom plate 2 having an enlarged area at the end of a straight pipe 1.
The excavation surface of the ceramic circular bottom plate 2 is provided with a steel excavation blade 3, and the upper surface thereof has a circular projection 4 integrally formed with the bottom plate 2, which covers the straight pipe 1 and is connected with bolts or the like. Further, on the upper surface of the bottom plate, the straight pipe 1 is inserted into the excavating case 5 with a steel brim, and the engaging projection 6 is engaged with the engaging groove 6 provided at the lower end of the excavating case 5. Thing 7
A straight pipe 1 inside the lower part of the excavation case 5
Since the guide plate 8 for centering is loaded, the engaging portions accurately mesh with each other. Also, the electromagnetic plate 10 suspended by free bolts via the spring 9 loaded at the upper end in the excavating case 5 is provided. Since the steel cap 11 loaded on the upper end of the inserted straight pipe 1 is magnetically attached and supported in the excavation case 5, when the construction machine moves, the expanded bottom pile is detached from the excavation case 5. There is no.

FIG. 2 shows a rotation speed reducer 12 of the excavating case 5.
An excavator of an optional type in which a bracket 14 fixed to a leader 13 for excavating and lowering the excavator and a tip end of an arm 16 operated by a hydraulic operation of the body laying machine 15 are connected by pins. 5 The rotation speed reducer 12 loaded on the upper part is suspended by the wire extended from the drum of the excavator elevating leader 13 or the winch 17 mounted on the heavy equipment 15 via the pulley at the tip of the excavator elevating leader 13. The excavator, in which the excavated prefabricated pile is loaded in the excavator case 5, is moved to a predetermined position, and the excavator is rotated by itself and the wire is free, so that the excavator has its own weight and the excavation spiral provided in the excavator case 5. It descends by the excavation force of the brim. When the predetermined depth is reached, the excavation case 5 is rotated in the reverse direction and the winch 17 is operated to take up the wire. Off the engagement projection 4 rises leaving 拡底 prefabricated pile into the soil.

FIG. 4 shows a straight pipe 1 of an expanded pile as a water pipe 19 provided with a plurality of water holes 18 in a steel pipe or a rigid PVC pipe or the like, and a water permeable pipe 20 is covered with the water pipe 19. The pit 21 is buried underground using the drainage pit 21 and the like, and is used as a water permeable pipe that allows rainwater to penetrate into the underground. 5 is installed as a replacement part, and FIG. 5 shows the same method as that of FIG. This is an example.

[0022]

According to the present invention, a pile foundation is used for driving a pile up to a support layer in order to use a support ground existing in a deep part as a foundation of a structure. Although there is not much problem, in the case of soil where soft ground is continuously piled up thickly, in general, pile piles using friction piles or cast-in-place expanded piles (bulb construction method) are used to support piles. Each method strives to increase the
Although it has a certain characteristic, it is said that the settlement is caused by negative peripheral frictional force, or the expanded pile method by on-site construction is a kneading method using aggregated soil at the site, and there is variation in the strength of the expanded portion. There was also a problem with the construction method itself, such as the method of checking the accuracy was not sufficient.

According to the present invention, by producing all of the expanded piles at the factory, the design values can be accurately maintained in the shape and strength of the bottom slab, the cross section and the material of the straight shaft portion, etc. The foundation pile will be a reinforced foundation pile. For this reason, it is possible to select the material, shape and strength corresponding to the ground strength, so that it will be an economical foundation pile without waste. Since a conventional general-purpose heavy machine can be used as an option, it is possible to provide an extremely simple and economical expanded pile and buried machine.

[Brief description of the drawings]

FIG. 1 is a side cross-sectional view in which an expanded pile is set in a steel brim excavation case.

FIG. 2 is a related enlarged view of an enlarged pile bottom plate engaging projection and a dug case lower end engaging groove.

FIG. 3 shows a burial machine in which a digging case with a steel brim is mounted on a general-purpose heavy machine.

FIG. 4 is a side sectional view applied to a permeable pipe for rainwater underground reduction.

FIG. 5 is a side sectional view applied to a water-permeable pipe that spouts underground pore water and groundwater during an earthquake to the ground.

FIG. 6 is a schematic view of a retaining wall in which a steel column is erected in a straight pipe and fixed with reinforced concrete, and an enlarged cross-sectional view of an expanded bottom pile.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Straight axis 26 PC pile 2 Circular bottom plate 27 Retaining wall 3 Drilling blade 4 Circular projection 5 Excavation case 6 Engagement groove 7 Engagement projection 8 Guide plate 9 Spring 10 Electromagnetic plate 11 Steel cap 12 Reduction gear 13 Elevating leader 14 Connection Brackets 15 Heavy equipment 16 Arms 17 Winches 18 Water holes 19 Water pipes 20 Water permeable material pipes 21 Drain pits 22 Garbage collection baskets 23 Manholes 24 Posts for retaining walls 25 Reinforced concrete

Claims (2)

[Claims] A circular plate having an excavating blade on the lower surface, a circular projection having a small diameter with respect to the circular plate at the center of the upper surface, a straight-bottomed pipe is inserted and connected by bolts, and is a prefabricated expanded bottom pile. In addition, by providing a hookable projection that can be hooked and unlocked on the upper surface of the circular plate, the straight shaft portion is inserted into the excavator case with a steel collar, and the excavator is rotated and operated, thereby being provided at the lower end of the excavator case. The engaging groove and the engaging projection of the circular plate are engaged with each other, and the expanded pile can be buried in the ground without applying a rotating load to the straight shaft part by the weight of the excavator and the propulsive force of the collar. When the excavator is reached, the excavator is rotated in the reverse direction, and when the winch for the wire that suspends the excavator is operated and hoisted up, the hook is released, and the excavator rises while leaving the preformed expanded pile in the soil. If bending strength is required, after embedding, concrete or reinforced concrete拡底 prefabricated pile and embedded device, characterized in that can be reinforced by filling the cleat. 2. A plurality of water holes are drilled in the straight pipe of the prefabricated pile according to claim 1, and a corrosive water-permeable pipe made of synthetic resin or the like is covered, and buried in the soil to allow rainwater to permeate underground. An expanded bottom pile and burial machine, which is applied to a soil penetrating pipe pile that can separate ground pore water and groundwater from earth and sand during an earthquake and eject it to the ground to prevent ground liquefaction.