JP2830717B2 - Protection method of buried pipe under footing foundation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for protecting a buried pipe under a footing foundation.

[0002]

2. Description of the Related Art Buried pipes such as gas pipes and drain pipes are rarely buried under a footing foundation, which is a direct foundation. However, in special cases, they may be buried under a footing foundation. In this case, if the buried pipe is buried without protection, the buried pipe may be damaged by a load applied to the footing foundation. Therefore, the buried pipe is usually protected. As a method of protecting the buried pipe, (1) A simple pile is driven into the both sides along the buried pipe, and the load on the ground around the buried pipe is borne by the pile to reduce the force applied to the buried pipe. (2) Casting concrete around the buried pipe to load the footing foundation on the buried pipe into the concrete and reduce the force on the buried pipe is typical.

[0003]

All of the conventional protection methods require separate steps of pile driving and concrete driving.
This leads to an extension of the construction period and an increase in costs. Furthermore, the load bearing capacity of piles and concrete is not always sufficient, and sufficient protection has not been obtained for the extension of the construction period and the increase in cost.

[0004]

SUMMARY OF THE INVENTION The present invention uses a precast concrete member to achieve a shorter construction period, a lower cost, and a protection effect equal to or higher than that of a conventional protection method. .

That is, according to the present invention, (A) a precast concrete flat plate having fitting grooves along the longitudinal direction on both sides of a surface is horizontally placed in a digging groove provided at a predetermined place on the ground, and (B) A step of mounting the buried pipe, (B) fitting a tubular body in which both ends in the width direction of the precast concrete form member are fitted into the fitting grooves of the precast concrete plate, and covers the buried pipe with the precast concrete form member. Forming and closing the gap between both end faces of the cylindrical body, (C) backfilling the excavation trench, compacting the ground, and (D) building a footing foundation on the ground that has been leveled And a method for protecting a buried pipe under a footing foundation.

The gist of the present invention is to protect a buried pipe using a precast concrete member. Two types of precast concrete members, a flat plate and a profile, are used. As the precast concrete member, a member reinforced with a reinforcing bar is usually used. However, when the building is small and the footing foundation is small, the precast concrete member may not be reinforced with the reinforcing bar. The precast concrete slab is provided with grooves for fitting along the longitudinal direction on both sides of the surface, and is placed horizontally at the bottom of the groove excavated for burying the buried pipe. A buried pipe is also horizontally placed on the precast concrete plate, and a precast concrete section is installed from above to cover the buried pipe. The precast concrete section has a V-shaped section, an equilateral L-shaped section, a U-shaped section, a semicircular section, or the like, and has a length substantially equal to that of the precast concrete plate. Both ends in the width direction of the precast concrete form member installed so as to cover the buried pipe are fitted and fixed in fitting grooves of the precast concrete plate. As described above, the buried pipe is wrapped in the precast concrete member by the simple operation of placing the precast concrete member and the buried pipe in a predetermined order. Therefore, the buried pipe is protected from external forces without directly receiving the force transmitted from the footing foundation to the ground. And, since the tubular body wrapping the buried pipe is made up of precast concrete members reinforced with reinforcing steel as necessary, the tubular body part does not become a section loss of the ground and the force from the footing foundation It is transmitted to the ground smoothly.

The gap between both end faces of the cylindrical body is closed by fitting a plate made of wood, plastic, rubber or the like in a shape corresponding to the shape of the gap, thereby preventing earth and sand from flowing into the cylindrical body. .

After that, the trench is backfilled as usual,
The footing foundation is built on the ground that has been compacted by compacting the ground.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 (a) is a longitudinal sectional view showing a situation where a V-shaped member is used as a precast concrete member, and FIG. 1 (b) is an enlarged view of a fitting portion of FIG. 1 (a), and FIG. (D) is a longitudinal sectional view showing a situation where a U-shaped material is used as a precast concrete material to perform construction, and (e) is an enlarged view of a fitting portion of (d).

Referring to FIGS. 1 (a), 1 (b) and 1 (c), a protection method of the present invention using a V-shaped material as a precast concrete shape material will be described.

(1) A buried portion of a buried pipe 1 in the ground is excavated along a digging line 4 from the surface of the ground to form a groove, and a precast concrete plate 2 is horizontally installed at the bottom.

(2) The buried pipe 1 is also placed horizontally on the precast concrete plate 2.

(3) The V-shaped precast concrete section 3 is lowered from above so as to form an inverted V-shape to cover the buried pipe 1, and both ends are fitted into fitting grooves 8 provided in the precast concrete plate 2. And fix it.

(4) The triangular cylinder is composed of the precast concrete plate 2 and the V-shaped precast concrete mold member 3 and encloses the buried pipe 1, but there is a gap. Blockade.

[0016]

(5) The backfill soil 5 is put in the excavation trench, the ground is compacted and the ground is leveled.

(6) Placing concrete 7 as usual on the ground which has been leveled, and assembling the formwork, arranging reinforcing bars, and placing concrete as usual, then footing. Build the foundation 6.

1 (d) and 1 (e), the construction procedure is the same except that a U-type precast concrete section is used instead of a V-type precast concrete section.

The length of the tubular body composed of the precast concrete plate 2 and the precast concrete section 3 is generally equal to the width of the footing foundation as shown in FIG. 1 (c). Preferably, the end of the body is outside the footing foundation.

[0021]

According to the present invention, the buried pipe can be protected by a simple operation of placing the precast concrete members in a predetermined order, so that the construction period can be shortened and the cost can be reduced as compared with the conventional protection method.

[Brief description of the drawings]

FIG. 1 (a) is a longitudinal sectional view showing a situation in which a V-shaped member is used as a precast concrete member and construction is performed, and FIG.
(A) is an enlarged view of a fitting portion of (a), (c) is a horizontal cross-sectional view of the ground surface portion of (a), (d) is a vertical cross-sectional view showing a situation in which a U-shaped material is used as a precast concrete shape and construction is performed, (e) )
(D) is an enlarged view of a fitting portion.

[Explanation of symbols]

1. buried pipe, 2. precast concrete plate,
3. Precast concrete section, 4. Excavation line,
5. Backfill soil, 6. Footing foundation, 7. Discarded concrete, 8. Groove for fitting, 9. Sealing material for end face.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E02B 11/00 E02D 27/01 F16L 1/024 F16L 57/00

Claims (1)

(57) [Claims] (A) A precast concrete plate having a fitting groove along the longitudinal direction on both sides of a surface is horizontally placed in a digging groove provided at a predetermined place on the ground, and a buried pipe is placed thereon. Step (B): fitting both ends in the width direction of the precast concrete mold into the fitting grooves of the precast concrete flat plate, forming a tubular body covering the buried pipe by covering the buried pipe with the precast concrete mold, A step of closing a gap between both end surfaces of the cylindrical body, (C) a step of backfilling the excavation trench, compacting the ground, and leveling the ground;
(D) a step of constructing a footing foundation on the ground that has been leveled, and a method of protecting a buried pipe under the footing foundation.