KR102117392B1 - Method for constructing earth retaining wall - Google Patents

Abstract

The present invention relates to an earth retaining wall construction method. According to the present invention, the earth retaining wall construction method comprises: a jetting machine moving and installing step; a perforation step; a low jet pile (LJP) construction mode changing step; an LJP construction starting step; an LJP construction proceeding step; an LJP construction completion step; a double rod washing step; a jetting machine moving step; and a wall construction step. According to the present invention, each existing PHC pile can be integrated.

Description

Method for constructing earth retaining wall

The present invention relates to a method for constructing a retaining wall, and more specifically, each PHC ready-made pile can be integrated, and in particular, it can provide a certain effect as a forced displacement method for forming a columnar solid body in the ground. It relates to a method of constructing a retaining wall.

In order to construct underground structures in civil works or architectural works, underground ground is used by excavating the ground, and on the excavation surface of the ground before excavation, a temporary mudguard structure is constructed to prevent the ground from collapsing due to soil pressure generated during construction. have.

The temporary mudguard structure is constructed by various construction methods depending on the size of the earth pressure acting on the excavation surface, the site conditions, the type of the construction, and the construction method.

The construction method of this hypothetical mudguard structure includes the sheet pile method, RSW method, RPRW method, PSS method, SGP method, mudguard method using two-row H-file, CSR method, e-PHC method, and strut method And so on.

The sheet pile method is a method of forming a continuous wall by biting the joints of a board pile and using a vibrating hammer, water jet, etc., to form a continuous wall. It is difficult to type on hard ground, and on soft ground There is concern about settlement, construction is delayed in the presence of underground burial, deep excavation is difficult, and when the section is cut, it is vulnerable to water pressure or earth pressure, and there is a big noise problem when typed.

The RSW method is a mud-wall construction method in which H-Pile is punched or punched directly, a steel plate bent between H-Piles is inserted into a vibro hammer to create a wall, and then excavations are installed while supporting beams. After excavation, wall swelling occurs due to earth pressure, and wall stiffness is small, so it is difficult to apply it to a site where large earth pressure is applied.

The RPRW method is a mud wall construction method in which two thumb piles, which are inserted at a predetermined angle on the back side and the front side of the excavation, are connected to each other by friction-free hinges at the head to resist earth pressure action, and the wall of the wall due to earth pressure after excavation When it is considered in the longitudinal direction, the earth pressure bearing force is close to 0 when considered in the longitudinal direction, so the entire excavation surface is pushed toward the excavation surface. There is a problem that the interpretation of Korea is somewhat difficult, and there is a possibility of infringement of private guidelines by inclined piles when constructing downtown.

The PSS method is a method that does not generate noise and vibration because it is press-fitted after assembling the material without using large equipment for drilling and driving, and the inside is excavated with only small-sized drilling equipment.It uses a large amount of steel to increase its own rigidity. Since the construction cost is high, and installation and excavation are performed simultaneously, verticality management is important, which makes the work difficult, the water repellency is poor, and a special brace is required to increase the construction cost. In addition, the PSS method should work after crushing when the cancer is exposed to the lower portion, and it is difficult to become self-reliant when there are obstacles in the post.

The SGP method is a method of completing a guide file at a regular interval (C.T.C 1,280 or 1,300) on a plan surface of a provisional facility, and then inserting a hot rolled steel sheet suitable for a planned location between guide files to complete the earthen wall before breaking.

The two-column H-pile is a mudguard method combined with a post-heat pile that prevents shear failure of the mud wall with the concept of a heat-pile pile and a forced pile that serves as a mud-wall.

The CSR method is a self-supporting retaining method combined with an electric heat pile acting as a retaining wall and a post-heating pile preventing shear failure of the retaining wall in the concept of a forced pile.

The e-PHC method is a method of forming an earth wall by advancing an e-PHC (high strength centrifugal pile) ready-made pile.

The support beam construction method is applied to the support structure and is constructed in a structure as shown in FIG. 1. That is, after a plurality of H-type steel materials are formed along the edge of the trenching area to a predetermined depth in the ground at regular intervals, a trenching construction having a depth from the inner area to the lower side of the ground is performed. The earth retaining structure is installed by inserting a wood earthing plate 2 between the H-shaped steel materials 1 arranged at regular intervals to prevent the inflow of soil or groundwater by the earth pressure into the work place. The earth plate 2 is progressed together with the trenching construction by additionally inserting it between the H-shaped steel materials 1 as the trenching construction proceeds from the inside of the mudguard structure.

On the other hand, even if any of the above-described construction methods are used, the mud construction must have sufficient strength and stiffness as a means to safely dig, and therefore must be designed to withstand the working load. For this reason, although various construction methods as described above are applied, the construction methods have not yet been proposed in that they have their own disadvantages.

However, in addition to the construction method shown in FIG. 1, a method using a PHC ready-made pile is a method mainly used for constructing a retaining wall.

However, in the case of the prior art, when constructing a PHC ready-made pile, each pile cannot be integrated due to the separation distance between the pile and the pile, and the diameter of the ready-made pile is smaller than the diameter of the pre-drilled hole (450 mm pile after 508 mm drilling). In the sense that there is a shift in position from side to side, PHC ready-made piles are not suitable for the application of retaining walls where displacement control and rigidity are important.

LOW JET PILE(L.J.P) wall composition construction fills the grouts at the separation distance of each PHC ready-made pile, and integrates each PHC ready-made pile to form an earth retaining wall with excellent displacement control and rigidity.

In addition, through the filling of the grout of the agitated soil on the back of the mudguard, it shows an excellent effect on the soil improvement and the rear order of the mudguard.

And unlike J.S.P method, it can be applied to sandy gravel ground. This is because, when the flow rate of the groundwater is high or the groundwater level is high, the grouting curing time can be adjusted by using L.J.P-only admixture and water-glass chemicals.

On the other hand, the effect of the generally used chemical injection method depends on the soil layer composition and soil quality of the target ground.

Particularly, in a multi-layered complex or a layer with many thin layers interposed there is a tendency for the chemical solution to escape from the boundary of the layer, so it is very difficult to penetrate the gap between the particles of the desired ground and the amount of injection to obtain the expected effect. It is difficult to estimate in advance.

Moreover, it is difficult to confirm whether the desired infusion effect is exerted, and sometimes the effect does not appear at all.

Accordingly, various induction injection methods have been studied to remove the defects of the conventional injection method and to expect a certain effect, but considering that there has been no suitable method for actual construction until now, a new concept is not known. The need for construction technology for retaining walls emerges.

Korea Patent Office Application No. 10-2015-0094711 Korea Patent Office Application No. 10-2015-0108121 Korea Patent Office Application No. 10-2016-0048716 Korea Patent Office Application No. 10-2017-0079546

An object of the present invention is to provide a method for constructing a retaining wall which can provide a certain effect as a forced displacement method that can integrate each PHC ready-made pile, and in particular forms a columnar solid body in the ground.

The above object is, a jetting machine moving installation step of moving and installing a jetting machine (JETTING MACHINE) capable of puncturing and injection function to a position between a pre-installed ready-made pile and a ready-made pile; A puncturing step using a double rod that rotates a rotatable double rod near the ground and pushes fresh water to the drill bit through the double rod to make the double rod roll up to a planned depth; LJP construction mode changing step of changing the number of revolutions of the double rod to the construction mode of LJP (LOW JET PILE) by adjusting the timer of the jetting machine when the drilling operation is completed by the action of the double rod; By adjusting the ultra-high pressure pump (PUMP) mounted on the jetting machine to increase the injection pressure of the injection material, but when the injection pressure reaches a predetermined value, a jetting nozzle is mounted on the tip of the double rod to rotate while spraying the injection material. An LJP operation initiation step in which an LJP operation is initiated such that an operation of automatically rising while the nozzle rotates one or a half of a wheel is repeated; An LJP operation proceeding step of rotating the double rod but continuing the LJP operation to a planned injection upper limit while the jetting nozzle is raised to a desired depth; LJP work completion step of integrating each PHC ready-made pile by constructing to the upper limit of the injection and completing the formation of a columnar solid body by the injection material in the ground; A double rod washing step of washing the double rod after completion of the LJP operation; And a jetting machine moving step of moving the jetting machine to a next position.

A wall construction step of constructing a retaining wall based on the columnar solid body may be further included.

At the beginning of the LJP operation, the fresh water may be changed into a suspension.

The double rod may be washed by pressing fresh water in the double rod washing step.

In the puncturing step using the double rod, the puncture water is discharged in the first direction to be punctured, but air is continuously blown through the compressed air jet to prevent clogging of the compressed air jet due to backflow of slime (SLIME) and start the LJP operation In the step and the LJP work progress step, the injection material may be discharged in a second direction crossing the first direction.

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According to the present invention, each PHC ready-made pile can be integrated, and in particular, there is an effect capable of providing a certain effect as a forced displacement method for forming a columnar solid body in the ground.

1 is a view showing a general mud construction structure
2 is a flowchart of a method for constructing a retaining wall according to an embodiment of the present invention.
3 to 7 are some process diagrams of the method of constructing the retaining wall of FIG. 2.
8 is an image of tofu exposed after the completion of the LJP operation.
9 is a flowchart of a method for constructing a retaining wall according to another embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains may easily practice.

However, since the description of the present invention is only an example for structural or functional description, the scope of the present invention should not be interpreted as being limited by the examples described in the text.

For example, the embodiments can be variously modified and have various forms, so it should be understood that the scope of the present invention includes equivalents capable of realizing technical ideas.

In addition, the purpose or effect presented in the present invention does not mean that a specific embodiment should include all of them or only such an effect, so the scope of the present invention should not be understood as being limited thereby.

In this specification, the present embodiment is provided to make the disclosure of the present invention complete, and to fully inform the scope of the invention to those of ordinary skill in the art. And the present invention is only defined by the scope of the claims.

Thus, in some embodiments, well-known components, well-known operations, and well-known techniques are not specifically described to avoid obscuring the present invention.

Meanwhile, the meaning of the terms described in the present invention is not limited to the dictionary meaning, and should be understood as follows.

When a component is said to be "connected" to another component, it may be understood that other components may exist in the middle, although other components may be directly connected. On the other hand, when a component is said to be "directly connected" to another component, it should be understood that no other component exists in the middle. On the other hand, other expressions describing the relationship between the components, that is, "between" and "immediately between" or "neighboring to" and "directly neighboring to" should be interpreted similarly.

Singular expressions are to be understood as including plural expressions unless the context clearly indicates otherwise, and terms such as "comprises" or "have" include the features, numbers, steps, actions, components, parts or components described. It is to be understood that a combination is intended to indicate the existence, and does not preclude the existence or addition possibility of one or more other features or numbers, steps, actions, components, parts or combinations thereof.

All terms used herein have the same meaning as generally understood by a person skilled in the art to which the present invention pertains, unless defined otherwise.

Generally used dictionary definitions should be interpreted to be consistent with meanings in the context of related technologies, and cannot be interpreted as having ideal or excessively formal meanings unless explicitly defined in the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the description of the embodiment, the same reference numerals are assigned to the same components, and the descriptions of the same reference numerals are sometimes omitted.

(One embodiment)

2 is a flowchart of a method of constructing a retaining wall according to an embodiment of the present invention, FIGS. 3 to 7 are some process diagrams of a method of constructing a retaining wall of FIG. 2, and FIG. 8 is an image of tofu exposed after completion of the LJP operation.

Referring to these drawings, according to the method of constructing a retaining wall according to the present embodiment, each PHC ready-made pile can be integrated, and in particular, it has a certain effect as a compulsory displacement method of forming a columnar solid body 130 in the ground. Can provide.

Particularly, in the case of the present embodiment, the injection material (CEMENT PASTE) is injected from low pressure to high pressure to form a columnar solid body 130, and the range of application is very wide in obtaining the rear order of the PHC ready-made pile.

The method of constructing a retaining wall according to this embodiment, which can provide such an effect, is a jetting machine moving installation step (S10), a drilling step using a double rod (S20), a LJP construction mode change step (S30), and an LJP work initiation step ( S40), LJP work progress step (S50), LJP work completion step (S60), double rod washing step (S70), jetting machine moving step (S80) and wall construction step (S90).

The jetting machine movement installation step (S10) is a process of moving and installing a jetting machine 100 (JETTING MACHINE) capable of puncturing and injection into a position between a pre-installed ready-made pile and a ready-made pile as shown in FIG.

The drilling step using a double rod (S20) rotates the rotatable double rod 110 (Double Rod) as shown in FIGS. 3 and 4 in the ground while reciprocating the fresh water to the drill bit 111 through the double rod 110. This is the process of allowing the double rod 110 to roll up to the planned depth.

In the perforation step using the double rod (S20), the perforated water is discharged in the first direction (the lower direction of the jetting nozzle) being perforated, but air is continuously blown through the compressed air blowing port, so that the compressed air blowing port is caused by the reverse flow of the slime. Try to prevent clogging. The number of punctures at this time is blue water. Here, the first direction to be perforated refers to the lower direction of the jetting bar 120 in the direction of the dark arrows in FIGS. 3 and 4.

In the LJP construction mode changing step (S30), when the drilling operation is completed by the action of the double rod 110 as shown in FIG. 5, the number of revolutions of the double rod 110 is adjusted by adjusting the timer (not shown) of the jetting machine 100. It is a process to change to the construction mode of (LOW JET PILE).

The LJP operation starting step (S40) increases the injection pressure by adjusting the ultra high pressure pump (PUMP) mounted on the jetting machine 100 as shown in FIG. 5, but when the injection pressure reaches a planned value, the jetting nozzle 120 at the tip of the double rod 110, Jetting nozzle is installed to rotate while spraying the injection material (CEMENT PASTE), but the jetting nozzle 120 is automatically raised while rotating one or a half of a wheel, and the operation is repeated. In the LJP work initiation step (S40), the fresh water can be changed into a suspension to proceed.

Particularly, in the present embodiment, since the injection material is directly crushed after the blast wall is crushed and mixed in the jetting nozzle 120, the injection method is applied, and the efficiency is excellent.

As described above, the injection material may be cement paste (CEMENT PASTE), but may be changed to an LJP-only drug as needed.

The LJP operation proceeding step (S50) is a process of rotating the double rod 110 as shown in FIG. 6 but continuing the LJP operation up to the planned injection upper limit while the jetting nozzle 120 is raised to a desired depth.

In the LJP work initiation step (S40) and LJP work initiation step (S50), the injection material is injected in the second direction (the jetting nozzle horizontal direction) intersecting the first direction (the jetting nozzle lower direction). The injection of the injection material may be the second direction (the jetting nozzle transverse direction) by the jetting nozzle 120 as described above.

The LJP work completion step (S60) is a process of integrating each PHC ready-made pile (not shown) by constructing to the upper limit of the injection as shown in FIG. 7 and completing the circumferential solid body 130 by the injection material in the ground.

In the case of the present embodiment by repeatedly performing the LJP construction mode changing step (S30), the LJP work initiation step (S40), the LJP work initiation step (S50), and the LJP work completion step (S60), solid consolidation on the column during the ground ( 130) can be seen as a certain effect as a forced substitution method to create.

In other words, this embodiment uses low, medium, and high pressure jets (JETs) to disturb the ground and at the same time fill the grout (GROUT) material at the construction intervals of the ready-made piles, so that each PHC ready-made pile It is one of the wall composition methods to be integrated. In the case of this embodiment, the amount of injection can be adjusted regardless of the strata outside the general theory, and also, the amount of cement paste is adjusted for each depth by using time and pressure to adjust the amount of injection suitable for the ground. It is a very effective construction method.

Double rod washing step (S70) is a process of washing the double rod 110 after completion of the LJP operation as shown in FIG. In this case, it is preferable to wash the double rod 110 by feeding fresh water.

The jetting machine moving step S80 is a process of releasing the installation state of the jetting machine 100 and moving the jetting machine 100 to the next location.

The wall construction step (S90) is a process of constructing a retaining wall based on a columnar solid body 130. At this time, the wall can be constructed using PHC ready-made piles.

Hereinafter, the construction method of the retaining wall of the present embodiment will be described.

First, the jetting machine (100, JETTING MACHINE) capable of puncture and injection functions is moved to a position between the pre-installed ready-made pile and the ready-made pile (S10).

Next, while rotating the rotatable double rod (110, ROD) to the ground while rotating the water to the drill bit 111 through the double rod 110 to the double rod 110 to the planned depth (S20) ).

Next, when the drilling operation is completed by the action of the double rod 110, the timer (not shown) of the jetting machine 100 is adjusted to change the rotation speed of the double rod 110 to the construction mode of LJP (LOW JET PILE). (S30).

Then, by adjusting the ultra-high pressure pump (PUMP) mounted on the jetting machine 100, when the injection pressure reaches a planned value, a jetting nozzle 120 is mounted on the tip of the double rod 110 to rotate while spraying the injection material. However, the jetting nozzle 120 is automatically raised while rotating one or a half of a wheel, and at the same time, the LJP operation is started so that the above operation is repeated (S40).

Next, while rotating the double rod 110 but the jetting nozzle 120 is raised to the desired depth, the LJP operation is continued until the planned injection upper limit (S50).

Next, each PHC ready-made pile (not shown) is integrated by constructing to the upper limit of the injection and completing the formation of a columnar solid body 130 in the ground (S60).

Next, when the LJP operation is completed, after washing the double rod 110 (S70), the jetting machine 100 is moved to the next position to repeat the operation (S80).

On the other hand, thereafter, a wall of a retaining wall may be constructed based on a columnar solid body 130 (S90). At this time, the wall can be constructed using PHC ready-made piles.

According to this embodiment acting on the basis of the structure as described above, each PHC ready-made pile can be integrated, and in particular, it provides a certain effect as a forced displacement method for forming a columnar solid body 130 in the ground. I can do it.

The effects of this embodiment will be elaborated.

First, it is not affected by the soil composition or soil quality, and it is possible to intentionally inject the necessary amount of injection material at the required location.

Second, it can be applied to fine-grained soils, which are difficult to inject using ordinary injection methods.

Third, since it is forcibly displaced and filled the injection material at artificially created intervals in the middle of the soil, it does not affect nearby buildings or underground buried materials like the normal chemical injection method.

The method of this embodiment is possible throughout the water repellent construction including injection of chemicals, and is very suitable for the composition of the PHC retaining wall.

(Other Examples)

9 is a flowchart of a method for constructing a retaining wall according to another embodiment of the present invention.

Referring to this drawing, the method for constructing a retaining wall according to this embodiment also includes a jetting machine movement installation step (S10), a drilling step using a double rod (S20), an LJP construction mode change step (S30), and an LJP work initiation step ( S40a), LJP work progress step (S50a), LJP work completion step (S60), double rod washing step (S70), jetting machine moving step (S80) and wall construction step (S90) may be included.

On the other hand, in the case of the present embodiment, unlike the above-described embodiment, in the LJP work start step (S40a) and LJP work proceeding step (S50a), air is first injected in a second direction crossing the first direction, followed by the injection material Even if such a method is applied, each PHC ready-made pile can be integrated, and in particular, it can provide a certain effect as a forced displacement method of forming a columnar solid body 130 in the ground.

As described above, the present invention is not limited to the described embodiments, and it is obvious to those skilled in the art that various modifications and modifications can be made without departing from the spirit and scope of the present invention. Therefore, it should be said that such modifications or variations belong to the claims of the present invention.

100: jetting machine 110: double rod
120: jetting nozzle 130: columnar solidified body

Claims (6)

A jetting machine movement installation step (S10) of moving and installing a jetting machine (100, JETTING MACHINE) capable of puncturing and injection into a position between a pre-installed ready-made pile and a ready-made pile;
The rotatable double rod (110, Double Rod) is rotated by being brought into the ground while the fresh water is pumped through the double rod (110) to the drill bit (111), so that the double rod (110) is excavated to the planned depth. Drilling step using a rod (S20);
When the drilling operation is completed by the action of the double rod 110, the LJP construction changes the rotation speed of the double rod 110 to the construction mode of LJP (LOW JET PILE) by adjusting the timer of the jetting machine 100. Mode change step (S30);
By changing the fresh water of the drilling step (S20) using a double rod into a suspension to adjust the ultra high pressure pump (PUMP) mounted on the jetting machine 100 to increase the injection pressure of the injection material, but when the injection pressure reaches the planned value, the double rod 110 Jetting Nozzle (120) is mounted on the front end of the jet to rotate while jetting the injection material, but the LJP operation is repeated so that the jetting nozzle 120 rotates one or one and a half turns automatically. LJP work start step (S40) to be started;
An LJP operation proceeding step (S50) of rotating the double rod 110 to continue the LJP operation up to a planned injection upper limit while the jetting nozzle 120 is raised to a desired depth;
LJP work completion step of integrating each PHC ready-made pile by constructing to the upper limit of the injection to complete the circumferential solid body 130 by the injection material in the ground (S60);
After the completion of the LJP operation, the double rod washing step (S70) for washing the double rod 110 by pressure feeding the fresh water (S70);
A jetting machine moving step (S80) of moving the jetting machine 100 to a next position;
And a wall construction step (S90) of constructing a retaining wall on the basis of the columnar solid body 130.
delete delete delete According to claim 1,
In the drilling step (S20) using the double rod 110, the perforated water is discharged in the first direction (the lower direction of the jetting nozzle 120), but air is continuously blown out through the compressed air blowing port, so as to reverse flow of slime (SLIME). Prevents clogging of compressed air jets,
In the LJP work initiation step (S40) and the LJP work initiation step (S50), a method for constructing a retaining wall, characterized in that the injection material is discharged in a second direction (horizontal direction of jetting nozzle) crossing the first direction (downward) . delete

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