JP3430073B2 - Construction method of embankment anchor - 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 of constructing an anchor that is used for being buried in the ground and connected to and fixed to a ground structure such as a retaining wall block, and particularly for embedding in an embankment. The present invention relates to an anchor construction method.

[0002]

2. Description of the Related Art As an embankment anchor that is embedded in an embankment and is connected to and fixed to a ground structure such as a retaining wall block, the applicant of the present invention has patent Nos. 2509159 and 2509160.
The invention according to the issue is disclosed. As shown in FIGS. 8 and 9, these anchors are provided by extending a plurality of anchor tension members a such as PC strands in parallel and straight on the terrain, and arranging the end portions of each tension member in a channel member c or the like. It is fixed by a nut d or the like. A hardening material b such as mortar was placed around the anchor tension material, and the embankment was embedded on the hardening material b. Such an embankment anchor is easier to construct than an anchor that forms a hole in the ground and inserts a tension material to fix it, and it is not an invisible work in the hole, and the whole can be visually confirmed. Since it can be installed in the same manner, the performance of the anchor is highly reliable.

[0003]

In the above-mentioned conventional anchor, the anchor tension material a is fixed around the anchoring material a with the hardening material b to secure the adhesion with the surrounding embankment, but the anchor extends straight into the soil. Therefore, the pulling resistance was not good enough.
In other words, when a load is applied to the ground structure e and it is pulled,
In some cases, the entire anchor was pulled out and moved by a tensile load, and a sufficient anchor effect could not be exhibited.

In addition, a method of connecting the end portions of a plurality of anchor tension members with a channel member c and a nut d to integrate them to increase the tensile resistance is also adopted, but this joining work is time-consuming. , The construction cost was high.

When a plurality of overground structures e such as retaining wall blocks are stacked, the anchor tension members a connected to the aboveground structures e are also constructed in a plurality of steps. In other words, in order to fix the bottom structure of the above-ground structure to be stacked,
Anchor tension material a is arranged at the same height, embankment f is placed on the anchor tension material a to match the height of the next-stage ground structure a, and the anchor tension material a is also arranged on the embankment f. The work was repeated by the required number of steps. With this, the number of processes becomes too large, the construction period becomes long, and the cost becomes high.

Further, when the anchors are arranged in a plurality of stages, the embankment that fills the anchors arranged above is small. Since the embankment anchor obtains the anchoring force depending on the weight of the embankment, if there is a small amount of embankment on the top, the pullout resistance cannot be sufficiently secured.

[0007]

In the embankment anchor construction method according to the present invention, the anchor tension member is folded back in a U shape and disposed on the terrain, and a desired length is set from the folded back portion to the periphery. This is to secure the pullout resistance by placing and burying. In addition, the above-mentioned problem is solved by bending a desired end of the anchor tension member end protruding from the embankment upward or downward so that it can be connected to above-ground structures having different heights. Is.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION In the embankment anchor construction method according to the present invention, the anchor tension member is folded back into a U-shape and used. As an anchor tension material, there is an anchor tension material having a steel wire circumferential surface plated with a zinc aluminum alloy to prevent rust. The middle of these anchor tension members is folded back to form a U-shape, and the folded-back portion is arranged at the deepest position in the terrain. When using a plurality of anchor tension materials, arrange the folded parts side by side,
Side-by-side so that both ends of adjacent anchor tension members are close and parallel.

A desired length from the folded back portion is embedded in the hardened material. As the hardening material, normal mortar or concrete may be used, but dry grout mortar that absorbs moisture in the soil and hardens may be used. For embedding, specifically, it is preferable that the hardened material is cast in two times so that the anchor tension material is sandwiched between the upper and lower sides. By embedding in the hardened material in this way, when pulling load acts on the anchor tension material, this acts as a certain width on the soil due to the thickness of the cross section of the hardened material, so the anchor tension material moves into the soil There is nothing to do. In addition, since the folded U-shaped portion holds the earth and sand inside, it becomes a portion that exerts a large pullout resistance. The folded-back portion will be the anchor anchorage, and then the terrain will be the intermediate anchorage.

Embankment is filled on the anchor and the anchor is embedded. Both ends protruding from the embankment will serve as connecting parts for connecting above-ground structures such as retaining wall blocks.
This connecting portion is extended and connected to the above-ground structure, and earth and sand are buried between the embankment and the above-ground structure.

In another invention according to this application, when constructing the embankment anchor as described above, any one of the two end portions of the plurality of anchor tension members protruding from the embankment is moved upward or downward. It bends. In other words, the anchor tension members are arranged at the same height and a plurality of anchor tension members are embedded in the embankment, but only the connecting portion protruding from the embankment is arbitrarily selected and bent upward or downward to extend. If the above-ground structure is stacked in multiple stages or there are multiple connection points at the top and bottom, the anchor tension material is bent and extended to that point, so it is necessary to perform anchor installation and burying work many times according to the connection height. There is no such thing, and the construction is significantly simplified. Further, even if the anchor is not embedded too much above, it can be fixed to the connecting portion extended from the bottom, a situation in which the amount of embankment placed on the top becomes small can be avoided, and sufficient pullout resistance can be secured.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on the embodiments shown in the drawings. In the figure, 1 is an anchor tension material plated with zinc aluminum alloy.
Is bent in a U shape. The dry grout mortar 3a, which is a hardening material, is placed in the back of the topography 2 in the same arc shape as the folded portion of the anchor tension material 1 to form the lower portion of the rear fixing portion 4. After this, dry laute mortar 3a is placed in parallel from the lower portion of the fixing portion 4 toward the front side at appropriate intervals to form the lower portion of the intermediate fixing portion 5. The folded back portion of the anchor tension member 1 folded back in a U shape is placed on the lower portion of the rear fixing portion 4, and both left and right ends are placed on the lower portion of the intermediate fixing portion 5. In this way, a plurality of U-shaped anchor tension members 1 are arranged side by side. Adjacent anchor tension members 1 and 1 are bound 6 at appropriate positions.

A dry grout mortar 3b is cast on the dry grout mortar 3a to form a sandwich (FIG. 5). The intermediate fixing unit 5 has an intermediate fixing unit 5.
A dry grout mortar 8 is placed so as to connect the five to form the front fixing unit 7. The embankment 9 is filled on this, and the fixing portions 4, 5, and 7 are embedded in the embankment 9. The left and right ends of the anchor tension member 1 projecting from the embankment 9 to the front side are referred to as connecting portions 10. Some of the connecting portions 10 appropriately selected are bent and extended upward, and some are bent and extended downward. Although all the connecting portions 10 are bent upward or downward in the embodiment, a part of them may be bent upward or only bent downward. Steel fibers are mixed in the above-mentioned dry grout mortars 3 and 8.

The retaining wall block 11, which is a ground structure, is connected to the embankment anchor A constructed as described above. As the retaining wall block 11, an arch-shaped block whose middle portion is bent in an arc shape is used. Pass the connecting portions 10 of the anchor tension member 1 through the left and right connecting holes 12, and insert the nut 13
Fixed by. A plurality of retaining wall blocks 11 are piled up. The downward retaining wall block 11 is connected with the downwardly bent connecting portion 10 and the upper retaining wall block 11 is connected with the upwardly bent connecting portion. 10. Connect 10 and fix. FIG. 7 shows a case where the bent portions of the plurality of anchor tension members 1 are covered with the ring 14 to restrain the expansion of the connecting portion 10.

The embankment anchor A is further arranged on the embankment 9 raised as described above by the procedure described above. The connecting end portion 10 of the anchor A is also bent upward or downward as appropriate to be extended and connected to the retaining wall block 11 which is further stacked. Fill the space between the retaining wall block 11 and the embankment 9 with sand to complete the retaining wall. FIG. 6 is a conceptual diagram of the embankment anchor A. Since the anchor tension material 12 is embedded and hardened in the dry grout mortar 3.8, when the tensile load acts, the load is the hardening material 3.8. The thickness and width of the slab will affect the embankment 9. In other words, if the anchor tension member 1 alone is used, it will sink into the soil and the pull-out resistance cannot be sufficiently exerted, but the hardeners 3 and 8 can sufficiently exert the resistance force. Further, since the earth and sand are held inside the rear fixing portion 4 which is the folded back portion, the pullout resistance is remarkably improved. Further, the pulling load acts as a compressive load on the hardened materials 3 and 8, which is advantageous for mortar and concrete.

FIG. 4 shows a shape in which the front fixing section 7 is not continuous, but has a shape protruding to the left and right of the intermediate fixing section 5. A plurality of the pre-fixing section 7 may be provided in the longitudinal direction of the intermediate fixing section 5 while being appropriately separated. Further, the post-fixing portion 4 has a continuous structure of a predetermined width in which the folded back portion of the anchor tension member 1 is filled. By providing the front fixing part 7 in front of the terrain and embankment, the earth pressure load acting can be reduced. This is because the front fixing portion 7 has an effect of suppressing the clod that is about to collapse.

[0017]

The present invention has the above-mentioned structure and can obtain the following effects. Fold the anchor tension material back into a U shape and place the folded back part in the back of the terrain,
Since it was embedded in the hardened material of the desired length including the folded part,
The folded-back portion functions as a post-fixing portion orthogonal to the pulling direction. As a result, the pullout resistance is great and the anchor does not pull out. Since the earth and sand inside the U-shaped folded portion is surrounded by the anchor tension material, the pull-out resistance of the tension material in the embankment is significantly improved. When the folded-back portion is provided, the pull-out resistance of the rear fixing portion including the intermediate fixing portion is significantly larger than that of a general straight type anchor that is not bent. Since the U-shaped folded anchor tension material is not used for post-fixing with the channel material or the nut, there are no defects due to the use of these members, and the number of members is small and the construction cost can be reduced. U
When a tensile force acts on the folded back of the character shape, a compressive force acts on the hardened material in the rear fixing portion and the intermediate fixing portion, which are in the shape of the surrounding arch. That is, it is difficult for tensile force to act on a hardening material such as mortar, which is very advantageous structurally. Therefore, it is not necessary to reinforce the reinforcing bar, and the reinforcement of the steel fiber is sufficient. To fold the U-shape, simply bend the anchor tension member, and the size and length can be freely determined according to the size and shape of the ground structure. This is also the same as that it can be arbitrarily designed according to the characteristics of the embankment. By arbitrarily bending the connecting part of the anchor tension member upward or downward and extending it, it becomes possible to freely connect when stacking overground structures or providing multiple connecting points above and below, anchor installation, embankment work process It is possible to reduce the construction period and the construction cost by reducing the number of installations. The anchor can be buried deeper than the embankment surface, and the connecting part can be bent upward to connect with the above-ground structure. Therefore, the weight of the embankment on the anchor can be increased and a large pull-out resistance can be secured.

[Brief description of drawings]

FIG. 1 is a perspective view of a construction state in which the present invention is implemented.

FIG. 2 is a plan view of a construction state.

FIG. 3 is a vertical cross-sectional view of a construction state.

FIG. 4 is a plan view of another embodiment.

FIG. 5 is a sectional view of an intermediate fixing unit.

FIG. 6 is a conceptual diagram of an anchor.

FIG. 7 is an embodiment in which a connecting end portion is restrained by a ring.

FIG. 8 is a cross-sectional view of a conventional embankment anchor.

FIG. 9 is a plan view of a conventional anchor.

[Explanation of symbols]

A embankment anchor 1 anchor tension material 2 terrain 3 Dry grout mortar 4 Rear fixing unit 5 Intermediate fixing unit 6 unity 7 Front fixing section 8 Dry grout mortar 9 embankments 10 connection 11 Retaining wall block 12 connection holes 13 nuts 14 ring

   ─────────────────────────────────────────────────── ─── Continued front page       (56) Reference JP-A-2-240325 (JP, A)                 JP-A-7-11659 (JP, A)                 JP-A-63-223216 (JP, A)                 JP-A-51-706 (JP, A)                 Japanese Patent Laid-Open No. 7-238553 (JP, A)

Claims (2)

(57) [Claims] 1. An anchor tension member made of rust-proof steel wire is folded back in a U shape and placed on the terrain, and a desired length from the folded back portion is embedded in a hardening material, and a post-fixing portion and an intermediate fixing portion. In addition to embedding the anchor tension material up to the front end of the intermediate fixing part, the anchor tension material is embedded, and both ends of the anchor tension material protruding from the embankment are used as connecting portions to form a ground wall structure such as a retaining wall block. A method of constructing an embankment anchor, which is characterized by connecting and burying with earth and sand. 2. A plurality of anchor tension members made of rust-proof steel wire are folded back into a U shape and placed next to each other on the terrain, and each anchor tension member is hardened to a desired length from the folded back portion. While embedding it inside to form the rear fixing part and the intermediate fixing part, embed this anchor tensile material by embankment up to the front end of the intermediate fixing part, and also the end portions of the anchor tensile members protruding from the embankment. A method for constructing an embankment anchor, which comprises bending an arbitrary number of them upward or downward to connect them to a ground structure such as a retaining wall block as a connecting portion and burying with earth and sand.