JP3022082U - Concrete pile pile head cement removal device - Google Patents

Abstract

(57) [Summary] [Purpose] The structure is simple, the manufacturing cost is low, and the weight is light, which is advantageous in handling, transportation, and workability, and labor saving can be achieved. In the curing process, water-expandable rubber causes centripetal loss of the cross section, and after curing, the removal of the device filled with cement milk to induce cracks is extremely easy.
(EN) Provided is a concrete pile pile head cement removing device which is easy, reliable and practically useful. [Structure] A suspension bolt inside the pile head, two bottom plates that are inserted below the suspension bolt with a cement milk inlet hole in the center, and are interposed between the two bottom plates. At the same time, to provide a pile-head cement attaching device for a concrete pile, which is composed of a water-expandable rubber plate and a cylindrical body having an appropriate elasticity and extending from the bottom to the outer periphery above.

Description

[Detailed description of the device]

[0001]

[Industrial application] The invention is to insert a ready-made pile into a hole excavated in the ground, inject cement milk, remove the cement milk from the head of the pile and install a reinforcing bar, -It relates to a pile head cement removing device in the construction method of placing a toe.

[0002]

2. Description of the Related Art Conventionally, as a method and method for removing pile head cement from a concrete pile of this type, for example, a technique of mounting a core on the inner circumference of the head of the concrete pile (Jpn. (Gazette) Technology to dissolve and remove the plug body with a solvent after hardening the cement milk (Japanese Patent Publication No. 6-13766), or to attach a reinforcing bar to the lower part of a cylindrical body in which a steel plate is rolled into a cylindrical shape to provide a section defect. Means (Japanese Utility Model Laid-Open No. 4-26225) and the like are disclosed.

[0003]

[Problems to be solved by the device]

 The above-mentioned conventional methods and means have a high manufacturing cost of the core body and are heavy, so that there are many disadvantages in terms of handling, transportation and workability, and it is economically disadvantageous. Also, there is a problem in that removing the resin plug by dissolving it in a solvent is unreasonable in terms of safety, workability, handling of the material, and lacks in practicality. Further, forming a cylindrical body by winding an iron plate into a cylindrical shape is also expensive and expensive, and there are many disadvantages in terms of handling, transportation, and workability, which is economically disadvantageous. is there.

[0004]

[Means for Solving the Problems]

 The present invention has been made in view of the above conventional problems, and its purpose is low manufacturing cost, light weight, and advantageous in handling, transportation, and workability. Especially, the removal work after hardening cement cement is performed. It is an object of the present invention to provide a concrete pile pile head cement removing device which is easy and reliable.

As a means for this, a suspension bolt that is suspended inside the pile head, two bottom plates that are installed below the suspension bolt with a cement milk inlet hole in the center, and two A rubber plate that is interposed between two bottom plates and has a cement milk inflow hole made of water-expandable rubber that is integrally formed, and a cylindrical body that has an appropriate elasticity and that extends from the bottom to the upper outer periphery. It consists of and.

With the above structure, the water-expandable rubber inside the rubber plate expands with the progress of hardening of the cement milk after the inflow of the cement milk to promote the cross-section loss, and even after the hardening, cracks toward the center of the cement milk. It can be triggered and removed very easily and easily. Further, since the whole structure is simple and light, the conventional problems can be solved such that handling, transportation, and workability can be performed easily, safely and efficiently.

[0007]

【Example】

 Next, embodiments of the device according to the present invention will be described in detail with reference to the drawings. 1 is a vertical sectional view showing an embodiment of the device of the present invention, and FIG. 2 is a plan view of a rubber plate and a bottom plate, respectively. Reference numeral 1 is a suspension bolt that is suspended in the head of the pile. An upper portion has an eyebolt 2 for erection on the upper surface of the pile through a beveled streak and the like, and a lower portion has a male screw portion 111. Reference numeral 3 is a bottom plate which is inserted into the lower portion of the suspension bolt 1 and is provided with two upper and lower bottom plates. A suspension bolt insertion hole 4 is provided at several places and a cement milk inflow hole 5 is provided at the center. Reference numeral 6 is a rubber plate interposed between the upper and lower two bottom plates 3 and integrally formed with hanging bolt insertion holes 7 at several places and a water-expandable rubber 8 forming a cement milk inflow hole 68 at the center. Become. Reference numeral 9 denotes a cylindrical body having an appropriate elasticity, which extends from the bottom portion to the upper outer peripheral portion. An inwardly facing flange 10 is provided at the lower portion to interpose the rubber plate 6 between the two bottom plates 3. Installed. Also, 11.12 are nuts that are respectively screwed into the male threads 11 on the lower part of the suspension bolt 1 and are tightened and fixed via the upper part of the bottom part, the flange part 10 of the tubular body 9, the rubber plate 6 and the lower part of the bottom plate. .

FIG. 3 is a sectional view of a main part showing a usage state of the device according to the present invention, and FIG. 4 is a sectional view of a main part showing the usage state of the device. As shown in the figure, the device of the present invention is inserted into the head of the concrete pile P, and the knitted muscle B is inserted into the eyebolt 2 of the suspension bolt 1 and fixed to the upper surface of the pile P. When the concrete pile P is inserted into the hole dug in the ground in this state and cement milk C is injected into the pile, the pile P buried by the hardening is fixed in the soil. The injected cement milk C rises above the pile, passes through the cement milk inflow hole 5.68 in the center of the bottom plate 3 and rubber plate 6 of the device of the present invention, and is filled to the upper part of the pile.

Further, in the process of hardening the cement milk C, the water-expandable rubber 8 formed integrally with the rubber plate 6 of the present apparatus absorbs the water of the cement milk and expands, so that the central portion of the cement milk C is expanded. On the other hand, it causes centripetal loss in cross section and induces cracks after hardening. As shown in FIG. 4, when the device is lifted by the suspension bolt 1 or the knitting streak B, a large cross-section loss and cracks are generated in the rubber plate 6, so that the cement milk C is removed in a filled state. The hollow portion D is formed in the pile head of the concrete pile P.

Reinforcing steel bars (not shown) are inserted into the hollow portion of the concrete pile P, and formwork and concrete placing operations are performed to construct underground beams, columns and the like.

[0011]

[Effect of device]

 The pile head cement removing device according to the present invention has a simple structure, low manufacturing cost, and light weight, which is advantageous in handling, transportation, and workability, and labor saving can be obtained. In particular, at the bottom of the device, a rubber plate integrally formed with water-expandable rubber is provided at the part where the cement milk flows in, so that the center of the part is afferent by the water-expandable rubber during the process of hardening the cement milk. Since it causes cracks in the cross section and induces cracks after hardening, it is extremely easy and easy to remove this device filled with cement milk, it is highly reliable, and it is practically useful for pile heads of concrete piles. A cement removal device can be obtained.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the device according to the present invention.

FIG. 2 is a plan view of a rubber plate and a bottom plate in the device according to the present invention.

FIG. 3 is a cross-sectional view of a main part showing a usage state of the device according to the present invention.

FIG. 4 is a cross-sectional view of a main part showing a usage state of the device according to the present invention.

[Explanation of symbols]

 1 Hanging bolt 2 Eye bolt 3 Bottom plate 6 Rubber plate 8 Water-expandable rubber 9 Cylindrical body

Claims (1)

[Scope of utility model registration request] 1. A suspension bolt suspended in the head of a pile, two bottom plates inserted into the lower portion of the suspension bolt with a cement milk inflow hole in the center, and two bottom plates above and below the suspension plate. A rubber plate which is interposed between the rubber plates and integrally formed with a cement milk inflow hole made of water-expandable rubber, and a cylindrical body having an appropriate elasticity which is provided around the bottom portion and the outer peripheral portion above. A concrete pile pile head cement removing device.