JP2006328860A - Foundation structure of column - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a foundation structure of a column capable of generating an advantage even in inventory management of the column, while simplifying processing for forming the column. <P>SOLUTION: The length in the vertical direction of an independent rigid foundation 2 is arranged by taking into consideration overturning of a foundation, and becomes larger than the length for making an embedded column part 12 endurable against external stress in most cases without necessarily becoming the length of a quantity for supporting an appearing column part 11, and by arranging a holding means 3 for embedding the column by the required length from below when forming the embedded column part 12, the length of the column 1 can be set only in response to the required length of the embedded column part 12 regardless of a state of the rigid foundation 2 side such as the size of the rigid foundation 2 and the depth of an embedded hole 21, and the processing for forming the column 1 can be simplified, and the advantage can also be generated in the inventory management of the column 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a foundation structure of a column used mainly for road incidental facilities such as a protective fence, a soundproof wall, and a sign post.

  When installing a supporting column for road facilities on the ground, a part of the supporting column is usually embedded in an independent concrete block or a continuous concrete foundation, or a part of the supporting column is directly embedded in the ground or embedded independently. It is formed by bolting a column with a base plate attached to an anchor bolt embedded in a concrete block or continuous concrete foundation. Among these, in the case of embedding a part of the column, for example, in a pedestrian bicycle fence installed at the boundary between the sidewalk and the outside of the sidewalk, Non-Patent Document 1 shows the necessary depth of column embedding, It is indicated that a depth of 400 mm is required for the independent foundation (C) and a depth of 200 mm is required for the continuous foundation (W) in the installation for the P type crossing restraint.

Guard fence installation standards and explanation (revised version) P75, Table 3.4.1 (issued by the Japan Road Association)

  However, with regard to the embedding depth of such support columns, it is necessary to prepare support columns having different lengths when installed on a continuous foundation and when installed on an independent foundation, and the processing related to the formation of the support becomes complicated. Moreover, there was a risk that inventory management would become complicated, such as a single length of struts becoming redundant.

  The present invention has been made in view of the problems as described above, and does not provide a strut foundation structure that can simplify the processing related to the formation of the struts and can also provide advantages in the stock management of the struts. It is what.

  In order to achieve the above object, the present invention is configured as follows. That is, the foundation structure of the column according to the present invention is provided with a buried hole in which the column can be embedded in the vertical direction of the rigid foundation, and a part of the column is embedded in the buried hole, and the column is embedded in the rigid foundation. The pillar structure in which the embedded pillar portion is formed and the remaining portion is the exposed pillar portion exposed from the rigid foundation, and at least the lower end of the pillar is lowered when the buried pillar portion is formed The holding means is provided so that the embedded column portion is embedded in the rigid foundation by a required length that can withstand external stress applied to the exposed column portion. It is.

  According to the foundation structure of the column according to the present invention, the vertical length of the independent rigid foundation is provided in consideration of the falling of the foundation, and is not necessarily the length that supports the exposed column part. In most cases, however, the embedded column will be longer than the length that can withstand external stress.However, when the embedded column is formed, it is necessary to provide a holding means to embed the column from the bottom to the required length. Regardless of the state of the rigid foundation side, such as the depth of the buried hole, etc., the length of the column can be made only according to the required length of the buried column part, and the processing related to the formation of the column can be simplified, In addition, it is possible to bring an advantage to the stock management of the support.

  The strut foundation structure according to claim 1, wherein the rigid foundation includes an independent foundation in which an integral strut is erected independently and a continuous foundation in which a plurality of struts are erected on an integral rigid foundation. As long as the length of the support column is set according to the length of the buried column part in the continuous foundation, the length of the support column used in the independent foundation and the continuous foundation is the same. As such, it is possible to further increase the advantages in processing and inventory management related to formation.

  According to the foundation structure of the support according to the present invention, the vertical length of the rigid foundation is provided in consideration of the fall of the foundation, and it is not necessarily the length that supports the exposed column part. In most cases, the buried pillar will be longer than the length that can withstand external stress, but by providing a spacer between the lower end of the column and the lower end of the buried hole, the size of the rigid foundation, the depth of the buried hole, etc. Regardless of the state of the rigid foundation side, the length of the support column can be set to an arbitrary length, the processing related to the formation of the support column can be simplified, and an advantage can be produced in the inventory management of the support column.

  BEST MODE FOR CARRYING OUT THE INVENTION The best embodiment according to the present invention will be specifically described below with reference to the drawings.

  FIG. 1 is a cross-sectional view showing an embodiment of a foundation structure of a support according to the present invention. The column 1 which is a steel round pipe is inserted into a buried hole 21 provided in a rigid base 2 which is an independent foundation made of a concrete block, and is embedded in the column. The exposed column portion 11 and the embedded column portion 12 embedded in the rigid foundation 2 are formed. The support column 1 and the rigid foundation 2 are used for installation of a protection fence. A plurality of support columns 1 are erected at regular intervals, and a mounting fence K is used between the exposed column parts 11 of the support column 1 to provide a protection fence. A protective fence F is formed by attaching the panel P.

  Here, the protective fence F is used for preventing the fall, and the height of the upper end of the panel P from the road surface is 1100 mm, and the height of the column 1 from the road surface, that is, the length H1 of the exposed column part 11 is 1100 mm. It has been. The height H2 in the vertical direction of the rigid foundation 2 needs to be long enough not to fall against the external stress applied from the lateral direction to the exposed column part 11, and here the height H2 is 450 mm. . The buried pillar portion 12 has a length of 20 cm, and in the buried hole 21, a holding means 3 that is a foamed synthetic resin spacer is provided between the lower end of the support column 1 and the lower end of the rigid foundation 2.

  In the conventional protective fence F, as shown in FIG. 5, the foundation hole H is first excavated in the ground GL, and the rigid foundation 2 is placed on the bottom of the foundation hole H. Here, the rigid foundation 2 is provided with a buried hole 21 having an inner diameter slightly larger than the outer diameter of the support column 1 penetrating in the vertical direction. Next, with the rigid foundation 2 placed on the bottom of the foundation hole H, the lower end portion of the support column 1 is inserted from the upper end of the embedded hole 21 so that the lower end of the embedded hole 21 and the lower end of the support column 1 are aligned. In a state in which the position of 1 is stabilized in the vertical direction, a mortar M or the like which becomes a rigid material after solidification is filled between the inner surface of the embedded hole 21 and the outer surface of the support column 1, and an embedded column portion 12 is provided to be independent. The column 1 was erected using the rigid foundation 2.

  Further, when the rigid foundation 2 that is a concrete block is formed in advance, a method is adopted in which the lower portion of the support column 1 is inserted into the mold and concrete is poured into the mold to form the rigid foundation 2 with the support column 1. It was. In these two conventional forming methods, the formation of the embedded column portion 12 is easy, but the entire embedded column portion 12 may not necessarily contribute to the strength for erecting the column 1.

For example, in the protective fence F for preventing fall shown in FIG. 1, according to the above-mentioned “protection fence installation standards / comments”, the P-type fall-proof fence can withstand a horizontal load of 390 N / m per 1 m of extension. It is prescribed. When the struts 1 are installed at intervals of 3 m, the horizontal load applied to the integral strut 1 is 1170 N / m at maximum, but assuming the most severe condition, total stress is applied to the tip of the strut 1 (height 1100 mm from the road surface). Assuming that this is the case, the required length L of the buried pillar portion 12 is calculated by the following equation 1. The concrete bearing stress level (pressure at which cracking occurs) is 810 N / cm ² .

(Formula 1)

  If the length L of the buried pillar portion 12 required from Equation 1 is calculated, it becomes 13.04 cm, and it can be understood that it is sufficient to bury about 20 cm even if the safety factor is set high. When a continuous rigid foundation is used, the length of the embedded column 12 of the support column 1 is specified as 20 cm in the same “protection fence installation standard / commentary explanation”. The supporting column 1 can be shared by an independent foundation and a continuous foundation.

  FIG. 2 is a cross-sectional view showing the formation of the buried column portion 12 in the support base structure according to the present invention. First, as in the conventional method, a buried hole 21 having an inner diameter that is often larger than the outer diameter of the column 1 is provided in the rigid foundation 2 that is a concrete block in the foundation hole H excavated in the ground GL. The means 3 is inserted into the buried hole 21. Subsequently, if the support column 1 is inserted into the embedded hole 21 from the lower end, the lower end of the support column 1 is held from below by the holding means 3 from below. In this state, between the outer peripheral surface of the support column 1 and the inner peripheral surface of the embedded hole 21, the mortar M that becomes a rigid material after solidification is filled to form the embedded column portion 12.

  After the mortar M is solidified, the support column 1 is supported by the mortar integrated with the rigid foundation 2 in the vertical and horizontal directions, so that the holding means 3 is inserted from the bottom until the mortar M is solidified from the insertion of the lower end of the support column 1. Since it is only necessary to hold the column 1 and it is not necessary to hold the column 1 over a long period of time, the holding means 3 is not particularly limited as long as it can hold the column 1 for a certain period of time. It can be used regardless of system or organic type, and metal, synthetic resin, paper, wood, stone, glass, brick, earthenware, tiles, etc. can be used with appropriate thickness and shape depending on the weight and shape of the column it can.

  Further, the holding means 3 is formed using a material whose volume can be changed relatively easily, such as a foamed synthetic resin, an elastic body, a hollow body using the elastic body, a granular body, or a gel-like substance. The holding depth by the holding means 3 may be arbitrarily set on site by pushing and pulling the lower end of 1 from above.

  Furthermore, for the rigid foundation 2, those formed using concrete are preferable because they have high falling strength and high cracking strength, but are not limited as long as they can support the column 1, such as aluminum, steel, A metal made of stainless steel or the like may be used, or a foundation such as quarry stone may be used.

  FIG. 3 is an explanatory view showing another example of the holding means 3. As shown in the perspective views of (a), (b), and (c), three or four ribs may be held radially or may be held by a cylindrical one. e) As shown in the cross-sectional views of (f), the shape of the mold is changed when the rigid foundation 2 is formed, and a step is provided in the middle of the embedded hole 21 or a protrusion is provided so that the lower end of the column 1 is The holding means 3 may be configured to be fastened or by closing the bottom of the buried hole 21 itself.

  FIG. 4 is a pie chart showing the shipping ratio for each length of standard specifications in a certain P-type fall prevention fence. The graph shows the ratio of the number of units shipped, (a) is a column used for an independent rigid foundation, and the conventional total length is 1550 mm, (b) is a column used for a continuous rigid foundation, Similarly, the total length was 1300 mm. (C) is a support | pillar directly embed | buried in soil, (d) is a support | pillar attached to an anchor bolt using the base plate provided in the lower end. Of these, 55% of the total of (a) and (b) is common by applying the strut foundation structure according to the present invention and setting the strut length to the length of the continuous rigid foundation. The commonality of the support pillars can be increased, the convenience during manufacturing and storage can be improved, and the response to fluctuations in demand can be facilitated.

  In addition, although the form in the protection fences, such as a fall prevention fence, was shown in the above-mentioned embodiment, the foundation structure of the support | pillar concerning this invention is not limited to application to a protection fence, a soundproof wall, a sign pillar, a signal It can also be applied to other road facilities such as pillars. In these cases, the height of the rigid foundation and the length of the buried pillar are determined according to each installation standard, and the height and length Accordingly, by using the holding means, it is possible to reduce the material to be used by shortening the length of the column, or to achieve the same effect as described above by sharing the column length.

It is explanatory drawing which shows one Embodiment of the foundation structure of the support | pillar concerning this invention. It is sectional drawing which shows the example of formation of the buried pillar part of the foundation structure of the support | pillar concerning this invention. It is explanatory drawing which shows the example of the holding means of the basic structure of the support | pillar concerning this invention. It is a pie chart which shows the ratio of the shipment number of the support | pillar of a protection fence. It is sectional drawing which shows an example of formation of the buried pillar part in the basic structure of the conventional support | pillar.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 support | pillar 11 exposed column part 12 buried pillar part 2 rigid foundation 21 buried hole 3 holding means

Claims (2)

An embedding hole is provided in the vertical direction of the rigid foundation, and a part of the strut is embedded in the embedding hole, and an embedded pillar portion embedded in the rigid foundation is formed in the supporting pillar and the remaining The structure is a foundation structure of a column whose part is an exposed column part that is exposed from the rigid foundation, and is provided with a holding unit that holds at least the lower end of the column from below when the embedded column part is formed. The embedded pillar portion is embedded in the rigid foundation by a required length that can withstand external stress applied to the exposed column portion. The rigid foundation is an independent foundation in which a single column is erected independently, and a continuous foundation in which a plurality of columns are erected in a single rigid foundation, and the length of the column is The strut foundation structure according to claim 1, wherein the strut foundation structure is set in accordance with the length of the buried pillar portion in the continuous foundation.