JPH02285108A - Manufacture of hollow pile reinforced by kneading woody fiber, steel cutting scrap and cement - Google Patents

Abstract

PURPOSE:To make it possible to construct a less expensive pile by erecting a hollow pile, with excavating bits attached thereto, formed of fibrous state materials made of lumbers from thinning with non-directional steel hexagonal metal lath and round steel reinforcements added as bar arrangement materials for reinforcement. CONSTITUTION:Materials made of lumbers from thinning, lumbering wastes or the like that are cut in fibrous state and are mixed with cement and steel cutting scraps are poured into a hollow pile-forming mold having therein a bar arrangement cage made by binding a hexagonal honeycomb metal lath 7, round steel band reinforcement 8 and round steel vertical reinforcements 9 into one unit, and a pile A is formed thereby. Then an upper steel cap 1 is attached to the head of the pile A and a lower conical shoe 11 equipped with excavating bits is attached to the lower end of the pile A. With the pile A attached to a driving member of a pile driver, the excavating bits 12 excavate soft soil and the pile A is erected thereby. With such arrangement, less expensive structural piles can be obtained.

Description

[Detailed description of the invention] ((a) (Objective of the invention) Deep mixed ground improvement for simple foundations on soft ground for two-story or newly permitted three-story wooden houses, one-story prefabricated warehouses, factories, etc. Piles are often used, but this is underground work that cannot be confirmed with the naked eye, so it is a method of checking whether the work is being carried out with good quality, uniform excavation agitation, and sufficient permeation of the soil hardening agent and cement milk into the crushed soil. As a result,
In the case of poor construction, there are many cases of problems such as foundations settling unevenly several years after construction, causing houses and warehouses to tilt. Rework after construction is extremely troublesome and expensive, as complete restoration is not what we expected. On the other hand, ready-made R and C piles are not only expensive in material cost, but also
Since only vibration-free and noise-free construction is permitted, hammering is not possible, and the hole must be drilled beforehand and then gently press-fitted. There is also the method of driving-in-place piles, but although this method is perfect, it is too expensive and unsuitable for shallow foundation construction, and is not economical. The scale of the construction work is often small and it is often impossible to bring in large heavy machinery.

As a result, in the case of construction work on such soft ground with a small tsubo size, ready-made piles other than cheap RC are available in the form of inexpensive, strong and strong resources, which are plentiful in Japan, are safe and easy to construct, and are durable over time. There are high expectations for the development of manufacturing and construction methods for ready-made piles that undergo little change and that do not cause uneven settlement.

(Rumor (Composition of the Invention) The main composition of the present invention is that the main material is made by cutting forest thinning wood, which is of little use and is produced in large quantities in Japan, into a fibrous form.
In addition to internal reinforcement reinforcement and round steel, this is a permanent material for steel diagonals generated in ironworks. Cement is added to this and placed in a mold, and the material is created by the action of centrifugal force caused by the rotation of the mold. This is an epoch-making pile that manufactures hollow piles and uses the excavation blade of the metal fitting that is in contact with the pile to excavate earth and sand and push it into the hollow part of the pile, completing construction and sinking in one shot without vibration or noise. It is a dovetail construction method.

The deep mixing method as a foundation construction method on soft soil has low reliability in construction, and RC piles, rehearse construction method, cast-in-place piles such as earth drill method, etc. are not economical for foundation piles for small houses etc. .

Manufacturing of piles based on the gist of the present invention will be explained in detail.

As a forest cultivation method, thinning is carried out to obtain good quality timber as the plantation grows, but since these are young trees with a narrow diameter and short length, they are unsuitable for sawing, and there are very few ways to use them. .

By effectively utilizing this as a main material, the forestry industry can earn stable supplementary income over a long period of time, and
A stable supply of raw materials will also be ensured in the pile manufacturing industry.

This thinned wood and lumber residue are cut into fibers using a cutting machine, and then a certain amount of cement, permanent steel processing scraps (so-called DARAICO) are cut into small pieces, and these materials are
In order to neutralize the high alkalinity of cement, a neutralizing agent is added and kneaded to create an insert material.

Inside the hollow pile forming mold K, a hexagonal honeycomb metal lath that is resistant to twisting and has no direction is joined by curving it into a cylindrical shape, and round steel bunts are installed at appropriate pitches outside the cylinder.

A suitable number of round steel bars with vertical reinforcement are placed on the circumference of this net-like metal lath alternately inside and outside in the length direction, and the hexagonal metal lath, round steel bundt °, and round steel longitudinal reinforcement are bundled together to create a cylindrical reinforcement cage. , install an appropriate number of spacers to prevent eccentricity.

This cylindrical reinforcing cage is placed in a pile forming die, and while the forming die is placed on a rotating roller and rotated, wood fiber materials, steel chips, etc.
Inject a mixture of cement and neutralizing material with water. Centrifugal force acts as the mold rotates, forming a homogeneous pile. The permanent steel chips are intertwined with the wood fiber material, intertwined with the hexagonal non-directional metal lath, and harmonized with the cement's hardening power to create a flexible and strong pile, which is left to cure for an appropriate period of time.

A steel cap is attached to the head of this pile, and a large hole is made in the center to allow air and dirt to escape when the pile is erected. Drill a hole from the side and secure with a set vault.

Three conical shears with excavating blades are fitted into the lower end of the pile and fixed with a set bolt from the outer periphery. A large hole is made along the conical excavation blade to serve as an entrance for the excavated soil.

[How to use piles]

Pile erection is based on vibration-free and noise-free operation.The pile anchor vault is attached to the driving part of the pile erecting machine by rotating and press-fitting it vertically.
The excavation blade acts as a guide and the earth and sand are automatically moved into the hollow part of the pile.
It is pushed up by the sinking pressure of the piles. Therefore, the pile does not discharge the earth and sand to the outside, but pushes it up into the hollow part of the pile itself, thereby greatly reducing the resistance to excavation and settling, which also saves rotational torque, making it possible to easily sink the pile.

Since the wood fiber material, which is the main material of the pile, and other constituent materials are buried underground, oxidation does not occur and there is no risk of rotting over many years.

If the construction site has a slightly high N value or is made of highly viscous clay, excavation will be easier if an appropriate amount of water is sprinkled around the outside of the pit, and there is no need to worry about the excavated soil forming into lumps.

[Explanation of an example of implementation using drawings]

An example of implementation of the present invention will be explained with reference to the drawings. ■The upper cap is made of steel, and as shown in the second diffraction plane diagram, it is located between the inner and outer annular members.■It is attached to the head of the antibody, which is mainly made of wood fibers, and as shown in the figure on the upper plane.■ Several anchor vaults are installed and are used to connect and secure the foundation with the cloth foundation after the piles are set, and to secure the piles to the construction equipment during pile erection. After attaching the crown to the pile body ■Fix to the pile body with a set vault. The pile body is made of ■wood fiber, ■cement, ■permanent cuttings of steel cut into short pieces, and ■curved hexagonal honeycomb metal lath made of zinc-plated steel with no directionality, which has strong torsional strength. The pile is rotated and press-fitted with crack-preventing material when the pile is erected, and the lower steel shoe at the bottom of the pile excavates the earth and sand with the excavation blade, so the pile body plays the role of an excavation rod, allowing the pile itself to be excavated. Resistance occurs and a twisting moment acts on the pile. As a result, cracks are likely to occur in the piles, so ■ Steel hexagonal honeycomb metal laths are adopted, and for force balance and reinforcement ■ Round steel band reinforcements are installed at an appropriate pitch, and [phase] round steel vertical reinforcements are installed with an appropriate number of teeth.■ A long cylindrical reinforcing cage is made by erecting hexagonal honeycomb metal laths and ■ round steel band reinforcement alternately inside and outside, and binding them all together with KO steel wire at the points where they intersect with the ■ round steel band reinforcement.

When this reinforcing reinforcement cage is stored in the mold, zero spacers are attached at key points to prevent the cage from being eccentric.

This reinforcing reinforcement cage is stored in a mold, placed on a mold rotation device, and the material is poured from one inlet through the injection guide, and the pile mold is rotated to apply centrifugal force to create a homogeneous material. Allow the cement mixture to solidify. After the cement is made into a mole, it is cured for an appropriate period of time and then removed from the mold. After taking out the pile from the mold, three excavation blades are welded together as shown in the detailed diagram of the fifth diffraction surface, and the earth and sand intrusion roller 3 is applied to the horizontal conical surface.
Insert the lower shoe with the holes in several places into the lower button of the stake, and
Secure with set vault.

Depending on the situation at the construction site, it is also possible to manufacture short piles in case long piles cannot be used. In that case, a steel flange type joint as shown in FIG. 6 can be fitted and set at the upper end of the lower part and the lower end of the upper pile, and the upper and lower flange parts can be tightened and fixed with a [phase] vault. The joints are firmly tightened with 0-set bolts from the outside of each of the upper and lower piles as shown in the 6th diffraction plane.

(c) [Effects of the invention] Utilizing forest thinning wood, which is abundant and permanently generated as a domestic resource, non-directional steel hexagonal honeycomb metal lath and round steel reinforcement are used as reinforcing reinforcement inside the pile. It is possible to achieve rational reinforcement with a smaller amount of reinforcing material than combination K. In addition, the wood fiber material uses wood with high tensile strength,
Permanent shavings made from steel chips are cut into short lengths and mixed with cement.The steel shavings are injected into the mold while being entangled with the wood fibers, and centrifugal force is exerted by the rotation of the mold. A homogeneous and strong pile is completed. Also, during construction, cracks due to twisting are less likely to occur even if the rotary press-fitting method is used. In addition, a steel cap is attached to the top of the pile, and the anchor vault on the top of the cap allows for easy button attachment to a construction machine during submergence, and the large hole in the center of the cap allows it to be pushed up into the hollow pile. This serves as an escape port for air and sediment. The steel shoe at the bottom of the pile has a digging blade and has an opening for pushing in soil, so the rotary press-fitting of the pile forces the soil in the penetration part into the hollow part without being discharged to the outside, so the rotational torque of the pile is reduced. It has the characteristics that it can be easily submerged.

Conventionally, in the case of sinking RC piles, a method that takes a lot of time and effort is used: excavating in advance with an earth auger, etc., and press-fitting the RC piles again.

Therefore, the material cost is high and the construction cost is also high, making it uneconomical.

On the contrary, the wood fiber steel scrap cement kneaded hollow pile of the present invention uses materials that are abundantly available domestically and have few uses.
Scrap steel is scrapped, and what requires processing is hexagonal honeycomb metal lath, which is cheap to manufacture. The installation of the piles is done in one go using the self-excavation method, so construction costs are low. In addition, compared to deep-mixed piles that lack stability in quality, the piles of the present invention are factory-produced prefabricated piles, so their quality is very stable, making them an effective building material for foundation piles. This can be said to be the case, and the economic effects from a resource perspective are enormous.

[Brief explanation of drawings]

Figure 1 is an overview of the entire pile, and a cross-sectional view of a part with attached metal fittings attached, Figure 2 is a cross-sectional view of the upper cap, Figure 3 is a cross-sectional view of the side wall of the pile, and Figure 4 is a plan view of the hexagonal honeycomb metal lath. figure,
The pJs diagram is a cross-sectional view of the lower shoe, and is a cross-sectional view of the excavation blade and the main parts of the earth and sand pushing part, and FIG. 6 is a cross-sectional view of the main part of the joint fitting of the short joint pile. Person...Pile overall view B...Top cap C...111-...Hexagonal honeycomb metal lath D...
・・・・・・Lower part 1-E・・・・・・・Short pile joint fittings parts list

Claims (1)

[Scope of Claims] [I] Prepare a material obtained by adding chips obtained by cutting permanent steel cutting waste into small pieces to a material obtained by cutting wood into short fibers, and kneading it with cement to make it homogeneous. do. A hexagonal metal lath is processed and formed into a long cylindrical shape in a mold that can be formed into a cylindrical shape, and this is banded with round steel material into a cylindrical hexagonal metal lath cage at an appropriate pitch. A suitable number of round steel reinforcements are placed, and the above bars are tied together strongly at band points to form a cage, which is then stored in a cylindrical mold, with spacers installed at various locations to prevent eccentricity. One side of the mold is closed, and the other side is equipped with an injection guide and fixed on a separate stand. While flowing uniformly into and out of the hexagonal metal lath reinforcement cage, the entire mold is rotated to perform centrifugal force forming for an appropriate period of time. To form the pile, the wood fiber material is strongly intertwined with steel-cut permanent chips and a hexagonal metal lath cage with cement milk to create a high-quality, strong, and light hollow pile. After a suitable curing time, it is removed from the mold. A steel head cap is penetrated and fixed to one end of the pile, and an anchor vault is attached to the top surface of the head, which serves as a connection to the cloth foundation after the site foundation work is completed, and also serves as a means of connecting the pile to the foundation when it is erected and sunk. At the time of , it is a combined vault with a pile erecting machine. A steel shoe is attached to the bottom of the pile, and a three-month earth and sand digging blade is attached to the outer peripheral wall of the conical bottom, and a large hole is drilled next to it. Pile sinking is done by rotating and press-fitting the pile using a pile-driving machine to ensure vibration-free and noise-free construction.In order to make the pile sinking easier, the digging blade of the lower shoe excavates the earth and sand without releasing it to the outside.
It is automatically pushed up into the hole next to the drilling blade and fits into the hollow part of the pile. Because the pile itself is rotated, unlike the conventional method in which the pile is sunk after drilling a pilot hole in advance, the pile can be easily excavated in one time without the need for a pilot hole. Manufacture of reinforced hollow parts made of wood fiber steel cuttings mixed with cement, which is characterized by the fact that construction can be completed without vibration or noise. [II] When short piles are required due to site conditions during the installation of the piles, steel connecting fittings are used to connect the upper, lower, and intermediate piles, and the piles are rotated and press-fitted while the lower piles are installed. Manufacture of a wood fiber steel waste cement-kneaded reinforced hollow part characterized by excavating earth and sand with a shoe excavation blade and automatically pushing it into the hollow part from a hole to be used as a long connecting pile.