JPH0747453Y2 - Pile joint structure - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a joint structure for a support pile such as a concrete pile to be driven underground.

The pile to which the present invention is applied has a diameter of 300 to 1000 mmφ.

[Conventional technology]

The conventional pile joint structure is generally a circumferential weld joint structure in which a groove portion is provided on the outer periphery of the metal fitting at the connection end of the pile, the upper pile is abutted against the lower pile, and the groove portion is joined by arc welding. Is.

The welding work that connects such piles is an outdoor work, and is greatly affected by the weather. When it rained, the welding effect was hindered and there was a risk of electric shock, so the work was stopped and there was a problem such as a delay in the construction period. Another manual welding welding method also recently, CO ₂ welding, there like non-gas welding process, the ratio is also improved welding work efficiency, there are those welding methods advantages and disadvantages for outdoor work, occupy the welding time Is still very large.

Advanced welding skills are required and qualified welding skills are required. Since the strength of the welded joint depends on the skill of the worker, it is necessary to secure a reliable technician.

Welded joints have the problem of cracking on impact,
Welding of the outer circumference of the pile is eccentric to the pile driving load, so careful measures must be taken.

[Problems to be solved by the device]

Circumferentially welded joint structure for connecting piles requires a long time for the welding work, and especially in the present situation where the diameter of the pile tends to increase in the future, the specific gravity of the welding time becomes larger and the pile driving work becomes more difficult. Greatly affect the.

An object of the present invention is to develop and provide a joint structure having a high connection strength with a minimum welding work.

[Means for Solving the Problems]

In order to achieve the above object, the present invention improves the connection of piles to a cylindrical joint structure which is completely different from the conventional circumferential welded joint structure,
Only a very small area of the cylindrical joint has an abutment structure, and the abutment is connected by welding.

That is, the present invention has one or several annular grooves provided on the circumference of the outer diameter in the vicinity of the end portion of each pile to be connected, and an annular ridge that fits into each annular groove in the inner diameter. An integral cylindrical connecting ring having a circumferential butt weld joint tightly fitted on the outer circumference of the pile across both piles, the circumferential butt weld joint exposing the weld joint. Is a joint portion of a pile, characterized in that the cylindrical connecting ring is a welded joint in a state of being crimped onto the outer circumference of the pile by a fastener provided with a welding window. The cross section of the annular groove may be trapezoidal, semicircular or inferior arcuate, or similar to these, as long as it has a wide opening width.

In the present invention, the term "abutment" as used in the present invention refers to an axial cut of a cylinder provided at one or more locations on the circumference of a hollow cylinder, as shown in FIG. This abutment may be parallel to the cylindrical axis direction, may be inclined, or may be curved.

Before connecting to the pile, this connecting ring has a split ring with two abutments or two abutments, and when the pile is connected, it is tightly fitted on the outer circumference of the pile. It becomes an integrated connection ring that is fitted on the outside. After connecting the piles, the connecting ring has an integral cylindrical shape, and has an annular ridge in its inner diameter that fits in both annular grooves of the adjacent piles to be connected.

The joint structure of the present invention is formed as follows.

(I) When the connecting ring is split into two, at the pile driving site, the ends of the piles to be connected are butted together and 2
The split connecting ring is fitted over both piles with the ridges aligned with the annular groove, and its outer diameter is tightened with a tightening tool such as a tightening band. At this time, do not cover the joints of the two split connecting rings with the fasteners,
This joint is welded and connected. The joint structure of the present invention is formed by removing the fastener after welding.

(Ii) If the connecting ring has a single end,
This connecting ring is fitted near one pile end. In this case, for example, like fitting the piston ring to the piston, the fitting hole of the connecting ring is slightly opened to increase the diameter, and the fitting can be easily performed from the pile end side. Next, the ends of the piles to be connected are abutted, and the connecting ring is moved in the axial direction of the pile so that the protrusions of the connecting ring are aligned with the annular groove of the pile.
Next, the outer diameter of the connecting ring is tightened with a fastener or the like, and the joint is welded.

[Action]

 The joint structure of the present invention produces the following effects.

(A) Since it is not necessary to weld the entire circumference, and only a small amount of welding is required at the joint of the connecting ring, joint formation is possible in a short time, and the time constraint of the pile driving work by welding work is significant. Will be eliminated.

(B) Since the piles are connected by the connecting ring and there is no circumferential welding, there is no variation in the strength of the connecting portion and the welding skill is not affected.

(C) The pile end member and the connecting ring forming this joint structure can be precisely manufactured, and the annular groove at the end of the pile is formed together with the reinforcing band integrated with the concrete pile. It is possible to standardize the precision and accuracy and to easily manufacture products of constant quality.

〔Example〕

FIG. 1 shows an embodiment of the present invention, and FIG. 1 (a) is a partially cutaway side view of a connecting portion of piles 1a and 1b during a connecting process.
Figure (b) is a view taken along the line BB.

Pile end fittings 2a and 2b are attached to the connecting lower pile 1a and upper pile 1b. Pile end outer peripheral reinforcing bands 3a, 3b having several annular grooves 4a, 4b are connected at the outer periphery of the end fittings 2a, 2b,
It is in close contact with the concrete piles 1a and 1b. These pile end metal parts 2a, 2b and pile end outer peripheral reinforcing bands 3a, 3b are PC steel rods 5
It is formed integrally with concrete by prestressing a and 5b. A connecting ring 6 is fitted on the outer circumference of the pile end portion outer peripheral reinforcing band.

FIG. 1 is a view during the welding process of the connecting ring. Although FIG. 1 shows a case where the connecting ring 6 has two abutments, the connecting ring 6 may be a cylindrical ring having one abutment. In the case of a connecting ring with a single abutment, this connecting ring is temporarily fitted to one of the piles in advance. This temporary fitting can be easily performed by using a jig for expanding the diameter by pushing the opening of the connecting ring open. In this case, it is sufficiently possible within the range of elastic deformation of the connecting ring.

Positioning is performed by placing the lower end of the upper pile 1b on the upper end of the lower pile 1a after driving, and the connecting ring 6 is provided with the annular protrusion 7 of the inner diameter of the upper pile 1b, the annular groove 4a of the lower pile 1a, Fit in 4b. When the connecting ring is divided into two parts, they may be fitted respectively, and for the connecting ring having a single opening, the opening may be pushed open and moved in the pile axial direction. Next, the outer diameter of the connecting ring is fastened with the fastener 9. The tightening tool 9 is, for example, a tightening band divided into two,
The ears may be fastened with the bolts 10, and the window 11 may be opened at the portion corresponding to the welded joint portion 8 of the connecting ring. The fastener 9 is not limited to the example shown in FIG. 1, and for example, a fastener utilizing fluid pressure may be used.

Next, the joint of the connecting ring is welded.

After the welding connection, the fastener 9 is removed to complete the formation of the joint structure of the present invention. In the structure of the present invention, the lower pile 1a and the upper pile 1b are tightened by the inner diameter of the connecting ring 6, and the annular grooves 4a, 4b are also tightened.
By fitting the ridge 7 to the lower pile 1a and the upper pile 1b, they can be strongly connected without coming off and separating.

It is free to provide welding connection grooves 11a and 11b on the outer diameters of the end fittings 2a and 2b so that they can also be used for welding connection. The combined use of the two joint structures does not depart from the technical idea of the present invention.

[Effect of device]

Since the pile joint structure according to the present invention involves a small amount of welding work, it is possible to easily perform the pile connection work in a short time.

In addition, since each member forming this joint structure can be manufactured in a factory, it has a certain quality and high reliability.

In the future, the fold pattern in which the pile tends to have a larger diameter, and the joint structure of the pile according to the present invention has a great effect in the field of civil engineering such that the construction is easy and the pile construction period can be greatly shortened.

[Brief description of drawings]

FIG. 1 (a) is a partially cutaway side view showing a state during a connection process of a pile joint structure of an embodiment of the present invention, FIG. 1 (b) is a BB arrow view thereof, and FIG. It is explanatory drawing of a gap. 1a, 1b ... Concrete piles 2a, 2b ... End fittings 3a, 3b ... Reinforcing bands 4a, 4b ... Pile end outer peripheral annular groove 5a, 5b ... PC steel rod 6 ... Connection ring, 7 ... Annular protrusion 8 ... Abutment, 9 ... Fastener 10 ... Bolt, 11 ... Window

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Bibliography SHO 50-12512 (JP, U) ACT ACT 50-90412 (JP, U) ACT 54-167511 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. An inner diameter having one or several annular grooves provided on the circumference of the outer diameter in the vicinity of the end of each pile to be connected, and annular protrusions fitted into the annular grooves, respectively. An integral cylindrical connecting ring having a circumferential butt weld joint tightly fitted on the outer circumference of the pile across both piles, the circumferential butt weld joint exposing the weld joint. A joint structure for a pile, wherein the cylindrical connecting ring is a joint portion welded to the outer circumference of the pile by welding with a fastener provided with a welding window.