JP2008184889A - Caisson construction method combined with guide hole method for constructing underground structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To use a guide hole method combined with a caisson construction method in order to keep the accuracy compatible with that in constructing an underground structure by an existing cut and cover method by improving the defects of bad accuracy such as the inclination and excessive sink in a conventional caisson construction method. <P>SOLUTION: An appropriate guide hole is deeply formed by an earth drilling-like drilling machine along the center of the wall at a place where the structure is to be constructed vertically about 2 meter or longer from the sunk fixed position. After the hole is filled with a granular solid matter such as gravel, an underground portion body wall is constructed, a soil part on the inside of the constructed wall is excavated, and the underground structure is sunk by utilizing the self-weight thereof while keeping the accuracy. The hole diameter of the guide hole is drilled wider than the thickness of the structure wall, the space between the position of the guide holes has enough distance not to lose the adjacent hole and the structure is prevented from the inclination and excessive sunk by sinking to the desired position. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention does not require a mountain stop when building a basement, does not perform excavation (excavation) in advance, builds the wall portion of the underground structure on the ground first, and excavates the inside by its own weight It is a construction method that will sink. Compared to the conventional open-cut method, there is an advantage that the excavated soil volume is significantly smaller and the construction cost can be greatly reduced, and the soil outside the underground structure body is hardly dug. Part of the construction), and the effect of mitigating the shock caused by the shaking at the time of the earthquake is reduced.
In the conventional submersion method, when the main body sinks, it is mostly tilted, misaligned, or excessively subsidized. This is a submersible construction method combined with a guide hole construction method for building underground structures.

In the conventional submersible construction method, the main wall of the structure is built on the ground, and the inside of the wall is pulled down by the excavation by heavy machinery, auxiliary excavation by human power, the weight of the structure, and excavation. In most cases, however, the method of guided submergence to the underground installation position has caused tilting or excessive subsidence during the submergence process. The correction is performed by a dangerous human power method, and it is difficult to guide to an accurate position.
For this reason, it is a construction method that is used for fire prevention water tanks and storage water tanks that can be used when there is a slight inclination or excessive subsidence.

Problems to be solved by the invention

In order to improve the deficiencies of inaccuracy such as tilt and oversink in the conventional submersible construction method, and to maintain the accuracy comparable to the construction of underground structures by the conventional open-cut method, it is solved by using the guide hole method together The task was to do.

The problem was to solve the effect of suppressing liquefaction caused by the ground during an earthquake.

Means for solving the problem

In order to solve the above-mentioned problems, the present invention provides a hole (hole) that can be adapted to the earth drill-like drilling machine as shown in FIGS. 1 and 2 along the center of the wall of the place where the target structure is to be installed. After digging deeply about 2 meters or more vertically from the vertical length of the underground part from the settling position, and filling this hole with granular solids such as gravel, build the underground part main body wall, inside the building wall This is solved by excavating the soil part of Fig. 3 to Fig. 5 and sinking it to the fixed position by its own weight. In addition, the diameter of the hole of the guide hole is wider than the thickness of the wall of the structure, the distance between the positions of the guide holes is maintained so that the adjacent holes do not collapse, and drilling is performed like a drill. Fill the hall with granular solids such as gravel, and after completion, place abandoned concrete to determine the low position of the wall of the built underground structure, mark the position, and build the wall of the structure This can be solved by making it possible to prevent subsidence, inclination and oversinking to a desired position.

Along with the above, along the outside of the outer wall of the target structure, a guide rail such as H steel is driven vertically to prevent tilting in the middle of subsidence, and when the target structure sinks smoothly along this The problem can also be solved by embedding it in the wall.

The invention's effect

The construction of the underground structure construction submersible construction method of the present invention significantly reduces the amount of excavated soil compared to the conventional open-cut method, which also reduces the amount of residual soil disposal and construction costs. Proportionally reduced significantly. In addition, the backfill after the completion of the underground part is only required to fill the gap, and a large amount of earth and sand in the conventional work is no longer needed, and the construction cost for this can be reduced as much as possible. . With the conventional open-cut method, it is impossible to make the soil similar to the state of the natural ground even if the natural ground (original soil) should be shaved and backfilled. As a result, the backfilling soil is separated and a danger of collision occurs. As a result, there is a high possibility that the impact of the earthquake will be large, and the impact on the building structure will increase. In the submersible construction method combined with the guide hole method of the present invention, since there is almost no need for backfilling, it is possible to integrate the shaking against the shaking at the time of an earthquake. Made it possible to decrease. In addition, the solid matter such as amber gravel filled in the guide hole is permeable to water, so that it has the effect of reducing liquefaction and solves the problem.

The submerged construction method combined with the guide hole construction method for constructing an underground structure according to the present invention does not require excavation work, so the construction range is small, and the distance from the adjacent land can be reduced as much as possible. The construction cost has been greatly reduced because large-scale earth retaining (climbing) work is not required, and it has become possible to eliminate the tilt and oversink that were the disadvantages of the conventional method. It does not require large heavy machinery used for mountain-clamping work and does not require extra digging, so it is possible to build a basement in a narrow site, and theoretically allow a structure to be built in a place more than 100 meters below the ground. It is possible. The cost of building a parking lot underground and the cost of building it above the ground can be done without much opening, so it is possible to build unnecessary structures underground at a low cost. It is a construction method with industrial value that can expand the range of use, and the range of use is wide.

Preferred embodiments of a submerged construction method combined with a guide hole construction method for building an underground structure according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows a positional relationship in which a guide hole B is provided at the position of the main body wall A, and FIG. 2 shows the situation in a sectional view thereof. Fill the guide hole with small gravel that is easy to collapse during excavation.

The subsidence and subsidence process of the submerged construction method combined with the guidehole method for building underground structures will be explained. FIGS. 6 to 8 show the situation of the conventional submersible construction method. FIG. 7 shows a situation in which a large gap is generated between the main body and the ground when tilting occurs while sinking and when sinking while tilting left and right. It is shown. FIG. 8 shows the situation when excessive subsidence of D occurs.

In the submerged construction method combined with the guide hole construction method for building an underground structure, FIG. 3 to FIG. 5 solve the above phenomenon. Fig. 3 shows the construction of the main wall after the construction of the guide hole, and shows how the gravel that has been filled collapses as the excavation progresses in the first stage of excavation inside the wall. FIG. 5 shows a situation in which the gravel of the guide hole collapses almost evenly and the main body wall sinks evenly and vertically, and FIG. 5 shows the situation where excavation has been completed and the main body wall has landed in place. By enforcing guide holes and filling gravel etc. in this way, excavation and subsidence of the wall of the main body can be performed smoothly, and accuracy can be improved significantly compared to the conventional method of subsidizing only by its own weight. It is a form of submerged construction method combined with guide hole construction method for underground structure construction.

Positional relationship to implement guide holes Sectional view of FIG. Guide hall combined construction first stage Intermediate situation in Figure 3 Completion of subsidence for construction with guide holes First stage of construction by conventional method Intermediate situation in Figure 6 Completion of subsidence by conventional construction method

Explanation of symbols

A Main body wall of building structure B Guide hole C Gravel gravel D Main body wall oversinking part E Tilt direction arrow F Ground (ground)

Claims (7)

Underground construction that can be installed by submerging to a desired position without requiring mountain-stopping work, while constructing on-site concrete structures or precast concrete structures to be built on the ground and responding to location and geological conditions Submersible construction method combined with guide hole construction method for structure construction. A submerged construction method combined with a guide hole construction method for construction of an underground structure incidental to claim 1 that allows a wall of a basement to be built on the ground, which can be tilted to a desired position and prevented from being oversunk. Before constructing the basement part on the ground, in the fixed position where the basement part wall is sunk and stopped, the appropriate hole (hole) is subsidized in advance with a ground drill-like drilling machine as shown in FIGS. After digging vertically more than 2 meters above the vertical length of the underground part from a fixed position and filling this hole with granular solids such as gravel, build the underground partial wall, and the soil part inside the building wall A submersible construction method combined with a guide hole construction method for construction of underground structures of Claims 1 and 2, where the underground structure is submerged by the dead weight of the underground structure. The diameter of the guide hole is wider than the thickness of the wall of the structure, and the distance between the positions of the guide holes is maintained so that adjacent holes do not collapse. Filled with granular solids such as gravel, and after completion, cast abandoned concrete to determine the fixed position of the wall of the built underground structure, mark the position, build the wall of the structure, A submersible construction method combined with a guide hole construction method for construction of an underground structure attached to claims 1 to 3 which makes it possible to prevent this from tilting and oversinking to a desired position. With the conventional submersible construction method, as shown in Figs. 6-8, it is possible to solve this weak point with a construction method that is problematic for buildings that require tilting and excessive subsidence phenomenon and require high accuracy. A submersible construction method combined with a guide hole construction method for building an underground structure attached to claims 1 to 4 which makes it possible to prevent this from tilting and oversinking to a desired position. When excavating along the inner periphery of the wall of the structure as shown in Fig. 3, when gravel filled in the guide hole appears, the gravel will collapse naturally, and only the collapsed part as shown in Fig. 5 Is a submersible construction method combined with a guide hole construction method for construction of underground structures attached to claims 1 to 5 for the purpose of sinking evenly and installing in place. H steel or the like is driven along the outer wall of the structure for vertical subsidence assistance, and it is possible to increase the accuracy of enforcement, and after the main body of the structure is installed at a fixed position, gravel below the main body Subsidence construction method combined with guide hole method for construction of underground structure attached to claims 1-6, which has allowed the function of a simple pile to prevent subsidence to work together.

Images