JP2509005B2 - Ground reinforcement 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 ground strengthening method for strengthening a target ground by an anchor body buried in the ground and a solidifying material injected into the surrounding ground.

[0002]

Problems to be Solved by the Invention A method for stabilizing unstable ground that has fluidity due to the presence of groundwater, such as sloping ground or deep ground surrounding ground, has heretofore been used during the drilling in the ground. Part of the ground is strengthened by inserting a reinforcing bar into it and injecting mortar, etc., or by inserting a tubular body with a bag attached at the tip into the drilling hole and expanding the bag, the surrounding ground is consolidated. It is typical to give strength to the ground itself by applying a compressive force to the ground or injecting a chemical liquid such as a solidifying material into the ground, and these are mainly used for the limited ground. It is a method applied to.

By the way, for example, when constructing a structure in a deep underground, the volume of the ground around the structure to be stabilized becomes enormous, so that the water pressure applied to the ground is large, In order to have sufficient strength to withstand and to maintain stability, careful construction according to scale is required,
Each of the above-mentioned conventional methods is intended to be a local ground, and thus cannot be an effective method by itself.

The most rational method for constructing a huge volume of ground is to inject a solidifying material, but the solidifying material only imparts compressive strength to the ground. Has the problem of being extremely brittle against tensile and shear forces.

The present invention has been made in view of the problems faced when stabilizing the ground especially in the deep underground, and it is intended to newly propose a method for reasonably stabilizing a large-scale ground. To do.

[0006]

[Means for Solving the Problems] Although the main cause of collapse of a fluid ground is ultimately when the ground loses shear resistance, in the present invention, In addition to injecting a solidifying material to solidify the soil and giving compressive strength to the ground itself, burying an anchor body in the ground and tensioning it, and introducing compressive force into the ground, tensile force and shear It provides resistance to forces, compensates for the weaknesses when using the solidifying agent alone, and effectively strengthens the ground with a huge volume.

The solidifying material is poured into the whole of the target ground and hardens to solidify the ground so that it has water-stopping property and compressive strength.

The anchor body is composed of a hollow tube and an inflatable bag body attached to at least the tip thereof, or further, a tension member attached to the hollow tube by being inserted into the hollow tube or being tied to the outside. And is embedded in the target ground in the thickness direction.

Tension is introduced into the hollow tube and the tension member from the base side depending on the situation.

The bag body at the tip of the anchor body is filled with a solidifying material and expands to consolidate the surrounding ground, and at the same time, is fixed to the end of the target ground. At this time, the tensile force of the anchor body is transmitted to the solidified ground into which the solidifying material has been injected. Further, when the hollow pipe or the tension member is strained, a compressive force is introduced into the ground, and a resistance force against the tensile force and the shearing force is given.

The anchor body may be embedded in the consolidation target area either before or after the injection of the consolidation material. For example, after the anchor body is embedded, the peripheral surface of the hollow pipe or the injection pipe attached to the hollow pipe. It is also possible to discharge the solidifying material into the ground through a discharge hole formed in the ground.

[0012] The anchor body also increases the adhesive force and frictional force with the earth and sand by arranging it at appropriate intervals in the depth direction and the lateral direction of the ground, and enhances the effect of the integrity of the ground itself. To do.

[0013]

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

[0014] The present invention imparts the tensile strength by injection and the anchor body 1 of Katayuizai 4 ₁ Ground (below the target soil) G of a target or subject, as shown in FIG. 1, or by tensioning of the anchor body 1 It strengthens and stabilizes the target ground G against shear force due to water pressure, seismic force, or the like.

FIG. 1 shows an embodiment in which the target ground G is a peripheral ground of a structure which is supposed to be constructed deep underground, and the entire target ground G is solid. binding material 4 ₁ are injected water cut and compression strength are given to the ground itself. The Katayuizai 4 ₁ cement milk or a chemical solution or the like is used.

The anchor body 1 is basically hollow tube 1 ₀ as shown in FIG. 4, consists inflatable bag body 2 which is mounted on at least the tip, consolidating material 4 in the pouch 2 _{When 2} is pressed in, it is fixed to the surrounding ground. Although FIG. 4 shows an embodiment in which to insert the tension material 3 into the hollow tube 1 _0, the bag body 2 intermediate portion of the hollow tube 1 ₀ depending on the case as described below Will also be installed.

[0017] Although hollow tube 1 ₀ is tensioned according to the situation after the expansion of the bag body 2, the inside of the hollow tube 1 ₀ as in the embodiment shown in Figure 4 when introducing tension to the anchor body 1 It is also possible to insert the tension member 3 in advance and tension the tension member 3 as described later.

[0018] in drilling the anchor body 1 is inserted, the necessary around the void of the hollow tube 1 ₀ prior to inflation of the bag body 2, or consolidating material 4 ₁ is filled after expansion.

As shown in FIGS. 1 and 2 which is a plan view of the anchor body 1, the anchor bodies 1 are radially arranged with an appropriate distance in the height direction and the lateral direction of the target ground G, and the thickness of the target ground G is set. It is inserted and buried in a drilled hole formed between both ends in the depth direction.

The hollow tube 1 ₀ is fabricated of metal or synthetic resin, and the bag body 2 is made of a stretchable or flexible material, for example sheet like the case of forming into a sheet bag drilling diameter is reduced into a hollow tube 1 ₀ diameter of about by mounting the hollow tube 1 ₀ the body 2 in the folded state.

[0021] The inside of the bag body 2 caking material 4 ₂ through the hollow tube 1 ₀ is filled after burying of the anchor body 1. While Katayuizai 4 ₂ bag body 2 which has been filled is compacted ground around the inflated, it is fixed in a manner that engages the interface between the target ground G and ground of the surrounding as shown .

[0022] When inserting the tension member 3 to the inside of the hollow tube 1 ₀ as shown in FIG. 4, or when integrated with a tension member 3 tying outside of the hollow tube 1 ₀ 7 , after the completion of the consolidation material 4 ₂ filling of the bag body 2 is the tension material 3 is introduced tension from the base side of the anchor body 1, the base of the tension material 3 as the anchor body 1, i.e. the target ground G Is fixed on the inner circumference side of. The tip of the tension material 3 is 4, which is fixed to the distal end of the hollow tube 1 ₀ 7, fixing of the base is done as usual by a nut fixing and wedge fixing the like.

The above target ground G which buried and tension is applied in the anchor body 1 in addition to the injection of Katayuizai 4 _1, be subject to compression in the thickness direction on the compressive strength is given By being placed in a state of receiving the original compressive force, it has a high tensile force and a resistance force to the shearing force.

[0024] anchor body 1 is more present, the frictional force and the adhesive force between the peripheral surface of the hollow tube 1 ₀ Ground anchor body 1 by being embedded at intervals appropriate in the target ground G is It is additionally generated, and the shear resistance force due to these is also added.

[0025] peripheral surface of the hollow tube 1 ₀ anchor body 1 shown in FIG. 5, at appropriate intervals in the axial direction and drilled a plurality of discharge holes 1a, the anchor body 1 into the target ground G those have a function that allows the solid-injection of binding material 4 ₁ of. In this case, solid injection of binding material 4 ₁ of the target ground G at the same time as the solid filler of the sintered material 4 ₂ to the bag body 2 through the inner tube (not shown), or carried out from the discharge holes 1a and after completion , If the solidifying material 4 ₁ covers the whole of the target ground G, the anchor bodies 1 are assembled again in the height direction and the lateral direction of the target ground G to perform the injection of the solidifying material 4 ₁ again. no, it is possible to complete the solid-injection of binding material 4 ₁ of the target ground G. In addition, the solidification material to the target ground G
The injection of 4 ₁ can also be performed independently of the filling of the bag body 2.

The embodiment shown in FIG. 3 shows the case of mounting a plurality of the bag body 2 to the peripheral surface of the hollow tube 1 _0, it was used an anchor body 1 state. In this case, as shown in the drawing, the bag body 2 located in the intermediate portion of the anchor body 1 expands, so that a consolidation effect on the target ground G is also added. Further, when the embodiment shown in FIG. 3 and the anchor body 1 shown in FIG. 5 are used, the adhesive force and the frictional force increase, so that the effect due to them increases further.

When the construction of the ground is performed only by installing the anchor bodies as in the conventional anchor construction method, it is difficult to integrate a plurality of anchor bodies because each anchor body behaves independently. In addition to the plurality of anchor bodies 1 being inserted into the solidified target ground G as a group, the expanding bag body 2 is located inside or outside the consolidation area, so that the anchor body 1 is a bag. not only integrated into the consolidated area by the expansion of the body 2, caused by earth pressure, the front portion of the bag body 2 which expands against the force to pull out the anchor body 1, formed by Katayuizai 4 ₁ Due to the existence of the solidified body that has been formed, and because this solidified body extends over the entire target ground G, the target ground G is composed of the compressive strength of the solidified body and the tensile force of the anchor body 1. It is given by the Te strong, the integral structure.

That is, in the present invention, the target ground G is fixed with the solidifying material.
A consolidation region formed by implantation of 4 _1, so that won Never effects obtained by singly by combining the anchor body 1 to expand the bag body 2.

The anchor 1 shown in FIG. 6 is a hollow tube 1 ₀ of the anchor body 1 shown in FIG. 1 has the same discharge hole 5a and a discharge hole 1a of the anchor body 1 shown in FIG. 5, with respect to the target ground G an embodiment in which was attached an injection pipe 5 for injection of Katayuizai 4 _1. In this case, solid injection of binding material 4 ₁ of the target ground G bag body 2
It will be performed independently of the filling.

FIG. 7 is shown in FIG. 5, shows the anchor body 1 in the case where the tension material 3 was tying the hollow tube 1 ₀ of the anchor body 1 having a discharge hole 1a, deformation of the fabrication example of FIG. 4 Here is an example.

[0031]

The present invention is as described above, and at the same time as injecting a solidifying material into the target ground to give it a compressive strength, the anchor body is embedded and its tensile force is applied. Since the force is transmitted to the ground and is further tensioned to introduce a compressive force into the ground, the ground is given a resistance to tensile force and shearing force as described above, and an enormous volume of ground is effective. Can be strengthened.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a vertical cross-sectional view showing another embodiment.

FIG. 4 is a cross-sectional view showing an example of manufacturing an anchor body.

FIG. 5 is a cross-sectional view showing a manufacturing example in the case of forming a discharge hole in a hollow tube of an anchor body.

FIG. 6 is an elevational view showing a manufacturing example in which an injection pipe is attached to the anchor body.

FIG. 7 is an elevation view showing a manufacturing example in which a tensile member is tied to a hollow tube having a discharge hole.

[Explanation of symbols]

G ...... target ground, 1 ...... anchor body 1 ₀ ...... hollow tube, 1a
…… Discharge hole, 2 …… Bag, 3 …… Tensile material, 4 ₁ …… Solid material, 4 ₂ …… Solid material, 5 …… Injection pipe, 5 a …… Discharge hole.

Claims (5)

(57) [Claims] 1. A step of injecting a solidifying material into the ground in a predetermined target area over the entire ground, and in the predetermined area,
Alternatively, a plurality of anchor bodies consisting of a hollow tube penetrating a predetermined region and an inflatable bag attached to the tip of the hollow tube are embedded, and a solidifying material is filled into the inside of the bag through the hollow tube.
A method for strengthening the ground, comprising the step of expanding the bag body and strengthening the ground around the bag together with the step of strengthening the ground in a predetermined area. 2. The discharge hole is formed in the peripheral surface of the hollow tube of the anchor body, and the solidifying material is injected into the ground in a predetermined region through the discharge hole. Ground reinforcement method described. 3. The method for strengthening the ground according to claim 1, wherein a tensile member is inserted inside the hollow tube of the anchor body or is attached to the hollow tube outside of the anchor tube. 4. The method for strengthening the ground according to claim 1, wherein the anchor body is tensioned to consolidate the ground. 5. The method for strengthening the ground according to claim 3, wherein the tensile member is tensioned to consolidate the ground.