JP3103862B2 - Widening civil engineering method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a widening civil engineering method.

[0002]

2. Description of the Related Art Conventionally, a construction method shown in FIG.

In this widening civil engineering method, a support b is erected on an existing concrete retaining wall a having an inclined wall e, and a horizontal frame d is provided between the support b and the top end wall c of the concrete retaining wall a. At the same time, the inclined frame f is interposed between the horizontal frame d and the column b along the inclined wall surface e of the concrete retaining wall a to form the floor slab support frame g.
A slab plate m is mounted on a horizontal frame d, and concrete n is cast thereon to form a slab h, and the slab h can be used as a sidewalk or the like. G is the ground, j is the chestnut stone, k is the anchor bolt, and p is the back chestnut.

[0004]

However, in the case of the above-mentioned wide-width civil engineering method, when forming the frame of the floor slab support frame g, the supporting column b made of heavy H-shaped steel and the respective frames d and f are welded. When the floor slab h is formed, the slab plate m is welded to the horizontal frame d, or the slab plate m is connected and fixed by the connection bolt, and the concrete is further placed on the slab plate. However, there is a problem that the widening work requires time and a sense of instability in the landscape.

[0005]

Therefore, according to the present invention, a wall is constructed on a retaining wall having an inclined wall, and a wall is formed in a space formed between the back surface of the wall and the inclined wall of the retaining wall. Filling and foaming the urethane foam stock solution to form a urethane foam backfill layer that adheres integrally to the back of the wall, and performs upper surface treatment such as embankment and pavement on the upper surface of the urethane foam backfill layer. The purpose of the present invention is to provide a widening civil engineering method characterized by widening the land.

Further, according to the present invention, urethane is mixed with an aggregate to form a urethane foam backfill layer, and as the aggregate, various foamed resin pieces, various plastic pieces, tire pieces, wood pieces, concrete lumps are used. , Asphalt lumps, pumice stones,
It is also characterized by the use of at least one of crushed stones and the like.

[0007]

[Function] The land widening work is performed according to the following procedure.

A wall is erected on an existing retaining wall having an inclined wall.

A space formed between the back surface of the wall body and the inclined wall surface of the retaining wall is filled with a urethane foaming stock solution and foamed, and is integrally adhered to the back surface of the wall body. To form

[0010] An upper surface treatment such as embankment or pavement is performed on the upper surface of the urethane foam backfill layer.

In this way, the urethane foam stock solution is foamed at the site of land widening to form a urethane foam backfill layer,
The hardened urethane foam backfill layer allows the wall and the retaining wall to be integrated, allowing the land to be widened quickly and easily.

Moreover, the urethane foam having a foaming ratio of 20 to 40 times has a uniaxial compressive strength of about 2 kgf / cm ² while having a unit weight of 25 to 50 kg / m ^{3, which} is extremely light. It can be safely used as a traffic widening ground.

Furthermore, when the foamed urethane backfill layer is formed by mixing an aggregate with urethane, the amount of expensive urethane used can be reduced and the strength can be increased. As the material, it is possible to use industrial waste such as various foamed resin pieces, various plastic pieces, tire pieces, wood pieces, concrete lumps, asphalt lumps, and at least one of pumice and crushed stones You can also.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 are construction flow diagrams of the widening civil engineering method according to the present invention, and the widening civil engineering method will be described with reference to the construction flowchart.

As shown in FIG. 1, a wall 2 such as a concrete panel is erected on a lower front surface 1a of an existing retaining wall 1 having an inclined wall surface 1b.

As shown in FIG. 1, a predetermined number of drainage pipes 3 are connected horizontally between the wall body 2 and the retaining wall 1,
Rainwater or the like can be discharged from the back chestnut 4 behind the retaining wall 1 to the outside of the wall body 2 through the drainage pipe 3. G is ground, 5 is top-end concrete, and 6 is foundation stone.

As shown in FIG. 2, in a space S (see FIG. 1) formed between the back surface of the wall body 2 and the inclined wall surface 1b of the retaining wall 1, a urethane foaming undiluted solution is injected into the urethane. The foamed urethane backfill layer 7 is formed by ejecting / injecting and foaming with an injection device (not shown).

At this time, the upper surface 7a of the urethane foam backfill layer 7
Is approximately the same height as the top end surface 1c of the retaining wall 1.

As shown in FIG. 3, a waterproof sheet 8 is stretched over the top surface 7 a of the urethane foam backfill layer 7 and the top end surface 1 c of the retaining wall 1 and the top end concrete 5 to cover them.

As shown in FIG. 3, soil and sand are spread over the upper surface of the urethane foam backfill layer 7 covered with the waterproof sheet 8, the top surface 1 c of the retaining wall 1, the surface of the top concrete 5, and the surface of the ground G. The embankment layer 9 is formed by embedding to a certain thickness. In addition, it is also possible to directly pave without forming the embankment layer 9.

As described above, the urethane foaming stock solution is foamed at the ground widening site to form the urethane foam backfill layer 7, and the cured urethane foam backfill layer 7 causes the wall 2 and the retaining wall 1 to be formed.
And the ground G can be widened quickly and easily.

Here, the urethane foam forming the urethane foam backfill layer 7 is (1) lightweight, (2) workability, (3) fillability, (4) composite structure, (5) self-sustainability, (6) Water resistance, (7) Strength properties, (8) Water permeability and water absorption properties, (9) Heat resistance, (10) Chemical resistance, (11) Shock absorption properties Things.

(1) Lightweight The unit weight is 25-50 kg / m ³ (can be set arbitrarily by mixing the stock solution) and ultra-light (about 1/1 of earth and sand / concrete).
50) is effective in solving the problem of settlement of the soft ground and insufficient supporting capacity.

(2) Workability The stock solution is pressure-fed with a hose and foamed 20 to 40 times to form a retaining wall made of urethane foam. With a small amount of small equipment and a small amount of material, a large amount of work can be performed in a short time, and the workability is very good. In addition, the formation of the ground at the construction site is easy and the workability is good.

(3) Fillability Since the urethane foaming stock solution foams several tens times and hardens, it has good fillability even when it has irregularities such as a block-stacking retaining wall.

(4) Composite Structure The foamed urethane is excellent in self-adhesiveness, and adheres to and solidifies with an object, so that it can be integrated as a composite structure. In addition, since a reinforcing material such as a reinforcing bar can be easily incorporated, a more robust structure can be formed.

(5) Self-Stability When the urethane stock solution is newly foamed in contact with the cured urethane foam, it is bonded and integrated with each other to form a continuous mass (lump) without weak lines, and as a self-standing structure Available.

(6) Water resistance The foam is a foam containing closed cells and is chemically stable, so that it is not deteriorated by water.

(7) Strength properties A foamed urethane foamed 30 to 40 times, about 2 kgf / cm
^{It has two} uniaxial compressive strengths, and can form a foam with higher strength by blending, and the strength required as a widening material is sufficient.

(8) Heat resistance In the case of a closed-cell foam, there is no water permeability.

(9) Heat resistance At 80 ° C. or lower, there is no problem in normal use.

(10) Chemical resistance Generally, it has resistance to acids and alkalis and does not dissolve in gasoline or kerosene.

(11) Shock Absorbing Property It has good shock absorbing property.

Further, by forming an urethane foam backfill layer 7 by mixing an aggregate with urethane, the amount of expensive urethane used can be reduced and the strength can be increased.

At this time, as the aggregate, styrene foam pieces, various plastic pieces, tire pieces, wood pieces, etc., which are industrial wastes, can be effectively used, and concrete lumps, asphalt lumps, pumice stones, crushed stones, etc. At least one of them may be used.

FIG. 4 is an explanatory view of a completed widening construction carried out by the widening civil engineering method according to the second embodiment, which is directed forward and upward from the rear surface of the wall 2 and the middle of the inclined wall 1b of the retaining wall 1. The urethane foam backfill layer 7 is formed in a space S formed between the rear surface of the wall body 2 and the inclined wall surface 1b of the retaining wall 1. 10 is a wall support.

As described above, the wall 2 is erected from the middle of the inclined wall 1b of the retaining wall 1 so that the wall 2 can be downsized and the back of the wall 2 can be secured while securing a predetermined widened area. It is possible to reduce the space S formed by the inclined wall surface 1b of the wall 1, that is, to reduce the urethane foam backfill layer 7, to reduce the amount of expensive urethane used, and to reduce the construction cost. it can.

FIG. 5 is an explanatory view of a completed widening construction carried out by the widening civil engineering method according to the third embodiment, and shows an existing block stacking wall 1 composed of a foundation concrete 11 and a concrete block 12 piled thereon. The widening of the land is performed by erection of the wall 2 on the basic concrete 11 described above, and the basic structure of the land widening is the same as that of the first embodiment. Numeral 25 is a stuffed concrete.

FIG. 6 is an explanatory view of a completed widening construction carried out by the widening civil engineering method as the fourth embodiment, and shows an existing block pile retaining wall 1 composed of a foundation concrete 11 and concrete blocks 12 piled thereon. The widening of the land is performed by erecting the wall 2 on the conglomerate block 12 located in the middle of the above. The basic structure of the land widening is the same as that of the second embodiment.

FIG. 7 is an explanatory view of a state in which the widening is completed by the widening civil engineering method as the fifth embodiment.
In the land widening structure constructed as in the embodiment, the upper part of the wall 2 and the top end face 1c of the retaining wall 1 are connected by the connecting member 13, and the lower part of the wall 2 is anchored to the lower part of the retaining wall 1. 14 to increase the safety of the widened land.

That is, as shown in FIG. 8, the connection bolt 15 is inserted into the bolt insertion hole 23 formed in the upper part of the wall 2 and the connection member 13 is inserted into the connection ring 15a formed at the head of the connection bolt 15. As shown in FIG. 9, the base end 16a of the anchor bolt 16 is fixed to the top end surface 1c of the retaining wall 1, and the distal end of the anchor bolt 16 protrudes upward.
The other end of the connecting member 13 is connected to the connecting member 16b by welding. 15b is a nut and 17 is a fixing material such as mortar.

As shown in FIG. 10, an anchor bolt insertion hole 18 is formed in the lower part of the wall body 2, while the base end part 14a of the anchor bolt 14 is fixed to the lower part of the inclined wall surface 1b of the retaining wall 1. The lower part of the wall body 2 is fixed to the distal end portion 14b of the anchor bolt 14 projecting forward through an anchor bolt insertion hole 18. 14c is a nut.

FIG. 11 is an explanatory view of a completed state of the widening construction performed by the widening civil engineering method as the sixth embodiment. In the land widening structure constructed as in the second embodiment, FIG.
By connecting the upper part of the wall 2 and the top end face 1c of the retaining wall 1 with the connecting member 13 and fixing the lower part of the wall 2 to the middle part of the retaining wall 1 with the anchor bolts 19 and 20, It has improved safety.

That is, the connecting structure of the connecting member 13 is the same as that of the fifth embodiment, and the fixing structure of the wall 2 is based on the middle part of the retaining wall 1 as shown in FIG. End 19a
The tip 19b of the anchor bolt 19 having the anchor bolt 19 is inserted through the lower portion of the wall 2, a nut 19c is fixed to the tip 19b, and the tip 19b of the anchor bolt 19 and the middle of the retaining wall 1 are separated. An anchor bolt 20 having a base end portion 20a fixedly connected to a distal end portion 20b of the anchor bolt 20 via a connection bracket 21. 20c is a nut. 24 is a spacer.

FIG. 13 shows a fixing structure according to another embodiment of the lower portion of the wall 2, in which a wall support bracket 22 having a wall receiving portion 22 a into which the lower end of the wall 2 can be fitted. An anchor bolt in which the upper and lower ends 22b, 22c are fixed to the middle part of the retaining wall 1 and the base ends 19a, 20a are fixed at predetermined intervals in the vertical direction.
It is fixed by the front end portions 19b and 20b of 19 and 20. 19c, 20c
Is a nut.

[0047]

According to the present invention, the following effects can be obtained.

The space formed between the inclined wall surface of the existing retaining wall and the back surface of the wall standing on the retaining wall is filled with the urethane foaming stock solution and foamed, and the back surface of the wall is Form a urethane foam backfill layer that adheres integrally to the
Since the upper surface of the urethane foam backfill layer is subjected to an upper surface treatment such as embankment or pavement to widen the land, such widening work can be performed quickly and reliably.

By mixing the aggregate with the urethane, a composite and integrated urethane foam backfill layer can be formed. As a result, the amount of expensive urethane used can be reduced, and a urethane foam mixture having an appropriate density and strength can be selected and used according to the use of each part.

In the above description, as the aggregate, industrial waste such as various foamed resin pieces, various plastic pieces, tire pieces, wood pieces, concrete lumps, asphalt lumps, or the like, or pumice or crushed stones may be used. It is also possible to improve the strength of the foamed polyurethane layer at low cost.

[Brief description of the drawings]

FIG. 1 is a construction drawing as a first embodiment of the widening civil engineering method according to the present invention.

FIG. 2 is a construction drawing as a first embodiment.

FIG. 3 is a construction drawing as a first embodiment.

FIG. 4 is a construction drawing as a second embodiment.

FIG. 5 is a construction drawing as a third embodiment.

FIG. 6 is a construction drawing as a fourth embodiment.

FIG. 7 is a construction drawing as a fifth embodiment.

FIG. 8 is an explanatory sectional view of a connection structure at an upper portion of a wall body.

FIG. 9 is an explanatory sectional view of a connection structure at an upper portion of a wall body.

FIG. 10 is an explanatory sectional view of a fixing structure at a lower portion of a wall body.

FIG. 11 is a construction drawing as a sixth embodiment.

FIG. 12 is an explanatory sectional view of a fixing structure at a lower portion of a wall body.

FIG. 13 is an explanatory sectional view of a fixing structure as another embodiment of a lower portion of a wall body.

FIG. 14 is a construction drawing by a conventional widening civil engineering method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Retaining wall 2 Wall body 3 Drainage pipe 4 Back chestnut 7 Urethane foam backfill layer 8 Waterproof sheet

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E01C 1/00 E02D 17/18

Claims (3)

(57) [Claims] 1. A wall is constructed on a retaining wall having an inclined wall, and a urethane foaming stock solution is filled and foamed in a space formed between the back surface of the wall and the inclined wall of the retaining wall. Forming a urethane foam backfill layer that is integrally adhered to the back of the wall, and performing an upper surface treatment such as embankment or pavement on the upper surface of the urethane foam backfill layer to widen the land. Widening civil engineering method. 2. The wide-width civil engineering method according to claim 1, wherein an aggregate is mixed with urethane to form a urethane foam backfill layer. 3. An aggregate comprising at least one of various foamed resin pieces, various plastic pieces, tire pieces, wood pieces, concrete lumps, asphalt lumps, pumice stones, and crushed stones. Item 2. The widening civil engineering method according to Item 2.