JPH0776841A - Support system for preparation of earth retaining pile arrangement drawing - Google Patents

Abstract

PURPOSE:To rapidly correspond to design alteration and efficiently prepare the relative materials like arrangement drawings of driving piles, integration tables of excavating works, etc., by automatically calculating the arrangement of piles in the design of earth retaining construction. CONSTITUTION:This system supports the preparation works of arrangement drawings, development drawings, integrating materials on the basis of received input data of earth retaining calculation data and earth retaining calculated result data. In this system, piles are arranged in a specified pitch on the side of an excavating face and the remaining length L of the side of excavating face is prepared with a previously preset length Lf. When the remaining length L exceeds the preset length Lf, previously set driving number of piles is again laid out evenly from a retroactive position. When the remaining length L is shorter than the preset value Lf, the arrangement of piles is completed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for designing a mountain retaining and earth retaining method. Specifically, it relates to a means for drawing a layout drawing of mountain retaining piles during excavation work.

[0002]

2. Description of the Related Art When constructing a structure underground, first, a stake is penetrated to an appropriate depth so as to surround the site, and root cutting is performed, but to prevent landslide and ground collapse,
It is necessary to secure a work site, and in order to select the reinforcements and calculate the penetration depth required for piles, etc., a sufficient ground survey is conducted in advance.

Based on the result of the ground survey, a pile retaining calculation is performed and the allowable stress of the ground and the allowable supporting force of the pile of the used material are checked to determine an appropriate material and the penetration depth.

In the ground investigation, a stratum is sampled at an appropriate depth by a boring survey to investigate the underground stratum structure. At the same time, the N value is measured by a standard penetration test or the like. Based on the depth of the geological survey and the observed geology, the geological structure that constitutes underground and the layer thickness of each layer are estimated. By referring to the sample data based on the soil quality and N value of each layer, ground data such as unit weight, adhesive force, N value, internal friction angle, lateral pressure coefficient, horizontal ground reaction force coefficient, etc. can be obtained.

An outline of the mountain retaining calculation will be described below with reference to the drawings. 1 to 4 are explanatory views showing the outline of the design of the mountain retaining method. When deeply excavating from the ground surface, the ground contacting the excavation surface will collapse due to its own weight. To prevent collapse, piles will be driven in and piles or earth retaining will be performed.

At present, depending on the type of pile, there are a construction method in which sheet piles are driven side by side, and a construction method in which H steel or rails are driven at appropriate intervals and a horizontal sheet pile is inserted into the fitting portion of the steel material to prevent it. Since sheet piles have a water blocking effect as well as mountain retaining, they are often used in the ground or revetment construction where groundwater often spurts out. The combination of H steel or rails and horizontal sheet piles is used for excavation work on a relatively strong ground as an inexpensive and easy method.

There are methods as shown in FIGS. Fig. 2 shows the method of holding the pile by balancing the main working pressure and the working pressure acting on the pile. In this case, only self-supporting calculation is required. Figure 3 shows a method used when the depth of excavation is large. A pile and a bellow are added to withstand the active pressure to reinforce the pile. A beam formula calculation is performed to obtain the anti-belly reaction force, bending moment, shearing force, deflection amount, and pile length indicated by P ₁ in the figure, and the steel strength is checked.

FIG. 4 shows a construction method used when it is difficult to install a crossbeam or when it is desired to use an underground space. Anchors are driven into the mountain retaining side walls to reinforce the piles. After beam calculation, anchor calculation is performed to calculate P ₁ / cos θ.

[0009] Overlay load qt / m ² due to earth and sand existing above the ground surface, excavating machinery, structures, etc., and lateral pressure coefficient determined by soil quality, groundwater level, etc., wet weight determined by soil quality, adhesive force, Obtain the internal friction angle and obtain the active earth pressure and passive earth pressure. The rooting length of the pile is determined based on the balance between the rotational moment of active earth pressure and the resistance moment of passive earth pressure.

From the determined pile length and the pile material to be used, the bending moment, the shearing force, and the flexure that act at the time of excavation, dismantling, etc. are checked to confirm that the strength can withstand.
Generally, piles are reinforced by cutting beams, raising the belly, or driving anchors. The strength is calculated in consideration of the reaction force received from the beam.

Such pile retaining or earth retaining calculations are performed for each excavation surface, and the parent pile type, pile length, and pitch for each excavation surface are calculated. From the data obtained from the mountain retaining calculation, we will produce the mountain retaining pile layout drawing, development drawing, accumulated materials of mountain retaining materials and related materials, etc. as necessary materials at the excavation site. Conventionally, the mountain retaining calculation is performed by using a manual calculation or a means for receiving a numerical value input instead of the manual calculation and outputting the calculation result. The layout of the stakes, etc. are also handwritten or C
Output using AD or the like is general.

[0012]

As described above, the pile retaining calculation is performed for each excavation surface to obtain the data necessary for excavation work such as the parent pile material, the pile length, and the pitch. Naturally, the earth retaining calculation data, the calculation result, the conditions such as the excavation depth are different for each excavation surface, and therefore the earth retaining calculation has different contents. Therefore, the mountain retaining calculation uses a manual calculation or a calculation means similar to the manual calculation.

When a layout drawing is prepared under the conditions for driving piles for each excavation surface, the arrangement of the piles becomes a problem at the portion where the excavation surface contacts. If the pitch is divided from one point on the excavation surface, the piles may be too close to each other and waste may be generated due to the arrangement of the piles on the adjacent excavation surface. Therefore, at the location where the excavation surface comes into contact, the pitch is reduced and the placement position is changed at the discretion of the creator each time, so the layout of the pile is also created by hand.

Since the collapse of earth and sand is likely to occur from the place corresponding to the valley of high strength on the excavation surface, together with the lack of bearing capacity of piles or piles for retaining earth, it is necessary to exert sufficient bearing capacity against earth pressure. It is important to calculate appropriate pile strength and placement pitch, and to evenly allocate piles. When the creator adjusts the layout of the piles when creating the layout plan, it depends on subjective judgment, which may cause problems such as lack of uniformity.

Further, in excavation work and the like, design changes are frequently made from the viewpoint of safety and the like, so it is necessary to re-compute mountain retaining calculations by hand each time, and to rewrite layout drawings, development drawings and related materials. Become. Creating a layout drawing by handwriting while determining the consistency of the excavation surface cannot cope with large-scale excavation or frequent design changes. Since the layout plan is the basis for excavation work integration, etc., prompt response to changes is required.

The present invention provides a means for automatically calculating the placement of piles to be piled in the design of the earth retaining method to quickly respond to a design change, and also relates to the layout of the piles to be piled up and the related materials such as the excavation work schedule. The purpose is to improve the efficiency of creation.

[0017]

In order to solve the above problems, according to the present invention, a system for receiving an input of mountain retaining calculation data or mountain retaining calculation result data and supporting the preparation of drawings, materials, etc., is excavated in a layout drawing. A pile is allocated from one end of the surface at a specified pitch, the remaining length of the side of the excavation surface is determined, and the arrangement of the piles near the other end of the excavation surface is adjusted to realize automatic creation of the layout plan. .

The pile retaining pile layout drawing creation support system of the present invention will be described below. FIG. 5 is an explanatory view of the outline of the mountain retaining pile layout drawing creation support system of the present invention.

First, as shown in FIG. 5 (1), piles are allocated from one end of one excavation surface at a specified pitch P, and the number N of piles to be placed on the excavation surface is counted, while the final pile is to be piled. The distance from the other end of the excavated surface is calculated as the remaining length L. When the remaining length L becomes equal to or less than the specified pitch P, the remaining length L and the set length L _f are compared.

If the remaining length L is less than or equal to the set length L _f ,
As in (2), the final pile is canceled, the pile arrangement on the excavation surface is completed, and the piles on the adjacent excavation surface are allocated. Although the case where the remaining length L exceeds the set length L _f are shown in (3) in FIG. 5, the distance from including final strokes設杭retroactive set number N _f position to the other end of the excavating surface P (N _f −
1) Calculate + L _f . Divide the set number by the distance {P
(N _f −1) + L _f } / N _f is calculated to adjust the driving pitch, and the piles are evenly allocated from the traced position. As for the strength of piles and the driving pitch, the bearing capacity has a large margin in consideration of safety, so there is no problem in the design contents if the set length is appropriate. Since the piles are evenly arranged, the support strength of the excavated surface is uniform and stable.

In order to use the pile retaining pile layout drawing creation support system of the present invention, a plotting calculation is performed by using an input unit that receives inputs of pile retaining calculation data, calculation result data, excavation surface data, set length and the like. It is necessary to have a system composed of a means for performing and drawing a layout drawing, a display unit for displaying data such as calculation results and drawings, and the like.

For data input, the mountain retaining calculation / calculation result data and the excavation surface data are linked so that the memories in which the mountain retaining calculation data, the calculation result data, the excavation surface data, etc. are already stored can be used as resources. It is desirable to provide a data input / output control unit so that data can be managed in units of excavation surfaces. In this case, it is also possible to build a mountain retaining method design system by incorporating an automatic processing means for mountain retaining calculation that receives input of mountain retaining calculation data, and a means for creating necessary construction materials such as development drawings and cost tables. .

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a mountain retaining pile layout drawing creation support system of the present invention will be described with reference to the drawings. FIG. 6 is a layout view of piles according to an embodiment of the present invention. On the other hand, FIG. 7 is a pile arrangement diagram according to a comparative example, in which piles are arranged at a specified pitch, and the set length which is a reference for pile arrangement adjustment in the present invention is 0.
Is the same as the one drawn as. Both use H steel No. 250.

The pile arrangement is adjusted in the circled area in FIG. 6, and as a result, the number of piles to be laid is 56. In Fig. 7, no adjustment was made, and as a result, the number of piles to be placed was 63. As is clear from the comparison, as long as there is no unnecessary driving of the piles and the set length is appropriate, the piles are evenly arranged, so that the piles have sufficient supporting strength and are stable.

[0025]

As described above, according to the pile retaining pile layout drawing preparation support system of the present invention, the piles can be evenly and accurately arranged on the layout drawing. Sufficient support strength for the excavated surface can be obtained and useless driving can be eliminated. There is no need to rely on the subjective judgment of the creator to place the piles. Since it is possible to automatically draw the pile layout drawing, it is easy to modify the drawing.

Including the system of the present invention, an automatic processing means for mountain retaining calculation, mountain retaining calculation data that can be managed in excavation surface units, a memory storing excavation surface data, etc., an input unit for accepting input of each data, and input of various data. The design of the earth retaining method can be automated by comprising an output control unit, a means for drawing and calculating a layout drawing, a development drawing, a means for creating integrated data, a data display unit, and the like.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an outline of design of a mountain retaining method.

FIG. 2 is an explanatory diagram showing an outline of a mountain retaining method design.

FIG. 3 is an explanatory diagram showing an outline of design of a mountain retaining method.

FIG. 4 is an explanatory view showing an outline of design of a mountain retaining method.

FIG. 5 is an explanatory diagram of an outline of a mountain retaining pile layout drawing creation support system of the present invention.

FIG. 6 is a layout view of piles according to an embodiment of the present invention.

FIG. 7 is a pile layout according to a comparative example.

Claims (1)

[Claims] 1. In a system for creating a pile layout drawing by a mountain retaining method design, piles are assigned to the excavation side length at a specified pitch, the remaining length of the excavation side is compared with a preset distance, and the remaining length is too large. If it is judged that the piles are piled up evenly from a location retroactive to the preset number of piles, and if the remaining length is judged to be sufficiently small, the pile retaining pile arrangement is characterized by terminating the pile allocation. Drawing support system.