JPH02296928A - H steel pile for placing soil cement - Google Patents

Abstract

PURPOSE:To integrate a lower end of an H steel pile and soil cement to securely support the H steel pile on the ground by providing ribs on the flange surface and the web surface of the lower end of the H steel pile. CONSTITUTION:Ribs da are fixed on the inner face of a lower end of flanges 2 of an H steel pile 1 comprising the flanges 2 and a web 3. The ribs 4a are provided symmetrically with respect to the web 3 in V-shapes with tilting angles of 45 deg. for example. Thus integration and highly close contact of the H steel pile 1 and soil cement can be attained so that the vertical load of the H steel pile 1 can be securely transmitted to the supporting ground through the soil cement.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to H
It is installed between steel piles.

Conventional Technology Conventionally, H-steel piles embedded and fixed as core materials in soil cement were simply H-beams, and no rear sections were provided.

Problems to be solved by the present invention As shown in FIG. 7, Htlll pile a is located in the groove.

Since each b' is in an oven state in the horizontal direction,
Due to the vertical load f applied to the H steel pile a, the soil cement C1C' in the groove b' tends to escape in the outward direction g, g' where it separates from the H steel pile a, and the soil cement c, c' There is a problem that the degree of adhesion (integrity with Hfjl pile a) does not increase, leading to a decrease in frictional force, and therefore, the lower end supporting force of the soil cement-embedded H61l pile a cannot be obtained sufficiently. As shown, subsidence occurs under a vertical load of approximately 20 tons. Soil-cement-embedded Hf1ll piles, which were previously only temporary structures, are now being used as permanent support piles, and the lack of lower end bearing capacity is a big problem that needs to be solved! ! It has become a problem.

In addition, as shown in FIG. 8, ribs d..., d'... may be provided on the flange surface and web surface of the H steel pile a. However, as shown in the illustrated example, the ribs d..., d'..., which are simply provided in the horizontal direction, cause breathing e to the bottom eight dots of the ribs d..., d'... when the soil cement hardens.
(Fig. 9), and the trace of the breathing e becomes a hollow part when it is completely cured, so the H1ll pile a
Instead of increasing the degree of adhesion between the soil cement a and the soil cement a, the hollow portions actually promote a decrease in the frictional force.

Therefore, an object of the present invention is to integrate the H steel pile and soil cement at the foot protection part at the lower end of the H steel pile, and to ensure that the vertical load applied from the H steel pile is transferred to the supporting ground through the foot protection part. An object of the present invention is to provide a soil cement embedded H steel pile which is improved so as to obtain sufficient lower end supporting force.

Means for Solving the Problems As a means for solving the problems of the prior art described above, a soil cement-embedded H steel pile according to the present invention is provided as shown in FIG.
As shown in the preferred embodiment shown in Figs. 6 to 6, the HtIll pile 1 is characterized in that ribs 4a and 4b are provided on the surface of the flange 2.2 at the lower end of the pile 1 and on the surface of the web 3.

In addition, in the above soil cement embedded H steel pile 1,
Ribs 4a... are provided on the inner surface of the flange 2.2 in a symmetrical arrangement in the shape of a diagonal to sandwich the web 3 at an inclination angle that prevents breathing and increases the adhesion of the soil cement 7. Another feature is that ribs 4b are stepped on both sides at an inclination angle to prevent breathing.

Function: Ribs 4a are provided on the inner surface of the flange 2.2 at the lower end of the H1 pile 1 at a constant angle of inclination, so that excess water and laitance when the soil cement 7 hardens are absorbed by the ribs. It rises quickly along the inclination of the rib 4a, no breathing occurs, and the supporting force (
frictional force) is increased. In addition, since the ribs 4a... on the inner surface of the flange 2.2 are arranged in a U-shape to sandwich the web 3, the gap where the vertical load f is applied to the H1 pile 1,
Because of the inclination of the ribs 4&, a force that restrains the soil cement 7 in the groove 6 of the HI pile 1 acts on the soil cement 7 inside the groove 5, and the HI pile 1 and the soil cement 7
By increasing the degree of adhesion, a large supporting force (frictional force) can be obtained (Figure 6).Incidentally, the supporting force in this case is able to withstand a vertical load of approximately 60 tons as shown in Figure 8A. It will be the size you get.

Also, ribs 4 are provided on both sides of the web 3 at a constant angle of inclination.
b... are provided, not only does breath song not occur, but also a large supporting force is exerted due to the protrusion effect of the ribs 4b. Incidentally, the supporting force in this case is large enough to withstand a vertical load of about 30 tons, as shown in FIG. 8B. The combined effect of the ribs 4a of the flange 2.2, the ribs 4b of the web 3, etc. is as shown in FIG. 8C.
This provides an extremely large supporting force that can withstand a vertical load of approximately 80 tons.

Embodiment Next, a preferred embodiment of the present invention shown in FIGS. 1 to 6 of the drawings will be described.

1 in the figure is an H composed of a flange 2.2 and a web 3.
! ml pile, and ordinary H-beam steel is used for this.

4a is a rear provided on the inner surface of the flange 2. Is this rib 4a made from a steel rod or reinforcing bar cut to the desired length? iJj'I, and are arranged symmetrically in a U-shape with the web 3 in between, and at an inclination angle of approximately 45°. In this way, the rib 4a is approximately 45°
The reason why the ribs 4a are provided at an angle is to quickly raise excess water and laitance generated when the soil cement 7 hardens, and to prevent breathing from occurring on the lower side of the ribs 4a, and to Applied vertical load f
This is to efficiently transmit the water to the soil cement 7 through the ribs 4a. Therefore, the inclination angle is not limited to 45''. Also, the ribs 4a on the inner surface of the flange 2.2...
The reason why is arranged in a V-shape with the web 3 in between is that the degree of adhesion between the H1ll pile 1 and the soil cement 7 (, l vibration force) with respect to the vertical load f applied to the H steel pile l. This is to increase the That is, since the ribs 4a are provided in a V-shape with the web 3 in between, when a vertical load f is applied to the Hll pile 1, the soil cement 7 in the groove 6.5 of the H1l pile 1 .7 is pushed inward of the groove 5.5, that is, in the direction of the web 3 (1 (direction)) by the inward force caused by the inclination of the rib 4a, and as a result, the soil cement 7 is pushed against the Hl steel pile 1. It is firmly restrained within the groove portion 5.6.Therefore, the vertical load f can be reliably transmitted to the supporting ground 6.

Next, 4b in the figure is a rib provided on both sides of the web 30. This is also a steel rod or reinforcing bar of the desired length that is fixed by welding, and is approximately 4mm long to prevent breathing.
It is installed at an inclination angle of 5° (Fig. 3).

Note that the ribs 4a..., 4b... usually correspond to the inner surface of the flange 2.2 at the lower end of the H steel pile 1 and both sides of the web 3, and correspond to the hardening part 7' of the soil cement 7. It suffices if it is provided in the area where it will be used (Figure 5). The reason for this is to effectively increase the degree of adhesion between the rich mix of foot hardening and the H steel pile 1 in the foot hardening section 7'. However, as shown in FIG. 6, it is not limited to the lower end of the H-steel pile 1, but it can also be provided at the top or over the entire length, or even on the inner and outer surfaces of the flange 2.2, with some effect. The vertical load f applied to the Hf1l resistor 1 is transferred to the surrounding ground 8 through the soil cement 7.
This is because it is effective to ensure the integrity of the H steel shaft 1 and the soil cement 7 using the ribs 4a... 4b... in conveying this information.

In this way, the soil cement 7 is restrained inside the H steel pile 1 by using the vertical load f applied from the H steel pile 1, and the occurrence of breathing caused by the ribs 4a..., 4b... As a result, the integrity (high adhesion) between the H-pile steel l and the soil cement 7 is improved, and the vertical load f of the H-pile l is reliably applied to the supporting ground a1 through the soil cement 7.
6 can be conveyed.

The effects of the present invention are as explained in conjunction with the embodiments, and the soil cement embedded H steel pile 1 according to the present invention has a flange 2
Ribs 4a..., 4b are provided on the inner surface of the web 3 and on both sides of the web 3.
... are provided at a constant angle of inclination, the H-steel pile 1 and the soil cement 7 are integrated and have a high adhesion, and a large bearing capacity is exhibited, so that the vertical load of the H-steel pile 1 is reduced. f
can be reliably transmitted to the support ground 16 through the soil cement 7, and there is no problem in providing it to the permanently installed support pile.

FIG. 8A is a perspective view showing the movement of the foot protection section.

B, CC, tHfj! A load deformation diagram of bearing capacity data when a vertical load is applied to a pile, Figure 9 is a perspective view showing the movement of soil cement (foot protection part) in a conventional H2N pile, Figures 10 and 11 are FIG. 12, a diagram showing a state in which ribs are provided horizontally, is a load deformation diagram of supporting force data when a vertical load is applied to the H111 resistor from 1.

l...H steel pile 2...flange 3...web 4a, 4b...rib 7.7'...soil cement

[Brief explanation of the drawing]

FIG. 1 is an enlarged perspective view of the lower end of the H steel pile embedded in soil cement according to the present invention, FIG. 2 is a plan view of the H steel pile embedded in soil cement, and FIG. 3 is a A cross-sectional view, Figure 4 is the 21st! Figures 5 and 6 are vertical cross-sectional views showing the usage status of H steel piles, and Figure 7 is a soil cement diagram. Figure diagram

Claims (1)

[Scope of Claims] [1] A soil cement-embedded H steel pile, characterized in that ribs are provided on the flange surface and web surface of the lower end of the H steel pile. [2] Ribs are provided on the inner surface of the flange in a V-shaped arrangement that sandwiches the web at an angle of inclination to prevent breathing and increase the adhesion of soil cement, and the web is also sloped on both sides to prevent breathing. The soil cement-embedded H steel pile according to claim 1, characterized in that ribs are provided at an angle.