JP2023110939A - Site raising method, and raised site structure - Google Patents

Abstract

To provide a raising technique that does not cause environmental destruction such as cutdown of a mountain, is inexpensive, and can be suitably applied to a site in a ground with a weak soil bearing capacity.SOLUTION: A top plate 2 is provided in a state of covering an upper end of a truss structure 1 provided on a site before raising. Ground replacement is performed in a state in which a resin block layer made of a resin block 4 for ground replacement occupies a concave portion formed by digging directly under a position of each fulcrum in the truss structure 1. The truss structure 1 is formed by combining diagonal members 11 with horizontal members 12a and 12b. The diagonal member 11 positioned at the outermost side extends diagonally upward to a center side of the truss structure 1.SELECTED DRAWING: Figure 1

Description

The invention of this application relates to a site raising technique.

Raising the existing ground surface of a site is carried out in the construction of residential land, roads, and the like. Site elevation is often carried out in subsidence areas, etc., but recently, it is becoming more important as a countermeasure against flood damage caused by torrential rain and tsunami damage, based on the lessons learned from the Great East Japan Earthquake. Furthermore, in the future, due to the sea level rise against the background of global warming, it is expected that the height of the site will become essential in coastal areas.

JP 2011-241672 A

Most of the current leveling is done by embankment, which is done by piling up earth and sand and crushed stones. Such a raising construction method requires earth and sand and crushed stones to be brought from another place, which is not preferable from an environmental point of view. That is, it is necessary to cut down the mountain to obtain earth and sand and crushed stone for the embankment, which may be one of the causes of environmental destruction. In addition, the earth and sand and crushed stones, including the parts required for transportation, are costly, and raising the height of a large-scale site requires a huge amount of money.

Another problem is that raising the land by embankment increases the load at the raised portion, which causes ground subsidence. When, for example, a house is constructed on a site that has been raised, the load of the raised portion of earth and sand and crushed stone is added in addition to the load of the house itself. For this reason, in the case of the ground having a weak bearing capacity, problems such as subsidence over time and uneven subsidence of the house tending to occur. This problem is conspicuous when elevation is carried out as a countermeasure against ground subsidence, and since the site is already raised on weak ground, it is likely that the ground will settle and the effect of the elevation will be offset.

The disclosed invention was made to solve such problems, it does not cause environmental destruction such as cutting down a mountain, the cost is low, and it is suitable for sites with weak soil bearing capacity. It is an object of the present invention to provide a raising technique that can be used.

In order to solve the above problems, this specification discloses an invention of a method for raising a site and an invention of a raised site structure.
The site raising method according to the disclosed invention includes a truss construction step of providing a truss structure on the site before raising, and a top plate construction step of providing a top plate while covering the upper end of the truss structure, In this method, before the truss construction process, a ground replacement process is performed to replace the ground of the site immediately below the position where each fulcrum in the truss structure is located.
The ground replacement step is a step in which a resin block layer made of a resin block for ground replacement occupies a concave portion formed by digging directly under each fulcrum position in the truss structure.
In this site elevation method, the truss construction process is a process of constructing a truss structure by combining diagonal members and horizontal members, and the diagonal member located on the outermost side extends diagonally upward toward the center of the truss structure. It can have a configuration that it is a step of
Further, the raised site structure according to the disclosed invention is a structure including a truss structure installed on the site surface before raising and a top plate covering the upper end of the truss structure. On the site of No. 1, a resin block layer made of resin blocks for substituting the ground is provided in a state of occupying a recess formed by digging directly under the position where each fulcrum of the truss structure is located.
In addition, in this raised site structure, the truss structure is formed by combining diagonal members and horizontal members, and the outermost diagonal member extends diagonally upward toward the center of the truss structure. have a configuration.

As will be explained below, according to the site raising method and the site raising site structure according to the disclosed invention, a space is secured by the truss structure when raising the site, so there is no need to cut down the mountain to fill the soil, and the environment is destroyed. It is possible to obtain a raised site without causing Since a large amount of earth and sand, crushed stone, etc. are not required, the cost including the transportation cost can be lowered. Moreover, since the load through each truss fulcrum is relieved by the resin blocks, the settlement of the site is effectively prevented, and it is particularly suitable for raising the site where the soil bearing capacity of the ground is weak.
Further, according to the configuration in which the truss structure is formed by combining diagonal members and horizontal members, and the outermost diagonal member extends obliquely upward toward the center of the truss structure, the truss structure This eliminates the need to reinforce the perimeter with embankments, shortening the construction period and reducing costs.

It is the cross-sectional schematic which showed the raising site structure which concerns on embodiment. 2 is a schematic perspective view of the truss structure shown in FIG. 1; FIG. FIG. 4 is a schematic perspective view of the total area occupied by the connected upper horizontal members and the total area occupied by the connected lower horizontal members; It is the perspective schematic diagram which showed about connection of a diagonal member and a horizontal member. It is the perspective schematic diagram which showed about connection of a diagonal member and a horizontal member. BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic which showed an example of the resin block for ground replacement, (1) is a plane schematic, (2) is a front schematic. FIG. 7 is a schematic front view showing a combination of resin blocks shown in FIG. 6; It is a schematic diagram of the site elevation method of the embodiment. FIG. 4 is a schematic front view showing another example of a truss structure; FIG. 11 is a schematic diagram showing an embodiment in which the outermost diagonals are oriented in opposite directions; 1 is a schematic front view showing an example of a multi-layered truss structure; FIG. FIG. 4 is a schematic front view showing an example in which a part of the truss structure secures a raising space;

Hereinafter, modes (embodiments) for carrying out the invention of this application will be described. FIG. 1 is a cross-sectional schematic diagram showing a raised site structure according to an embodiment. As shown in FIG. 1, the raised site structure of the embodiment includes a truss structure 1 and a top plate 2, and the truss structure 1 secures a space for raising. .

2 is a schematic perspective view of the truss structure shown in FIG. 1; FIG. The truss structure 1 is a skeleton structure of a truss structure, and is a structure configured by an assembly of triangular basic units. In carrying out the invention, the truss structure 1 may be a plane truss or a space truss, but in this embodiment, it is a space truss.
More specifically, as shown in FIGS. 1 and 2, in this embodiment, the truss structure 1 has a so-called Warren truss type structure without uprights. The truss structure 1, regardless of its form, has a triangle as a basic unit, and therefore has at least one skeleton member 11 extending in an oblique direction in each basic unit. Hereinafter, this is called a diagonal member. Further, the frame members 12a and 12b extending in the horizontal direction are called horizontal members.

As shown in FIGS. 1 and 2, the truss structure 1, which is a Warren truss structure, has a triangular basic unit formed by two diagonal members 11 extending from both ends of one horizontal member 12a, 12b. In the Warren truss, in particular, one horizontal member 12a, 12b and two diagonal members 11 form an equilateral triangle in the plane of the basic unit. That is, the two diagonal members 11 form an angle of 60 degrees with respect to one horizontal member 12a, 12b, and the lengths of these three frame members 11, 12 are equal.

The point where the diagonal member 11 is connected at the lower end is a so-called truss fulcrum. In this embodiment, the lower ends of four diagonal members 11 are connected at one truss fulcrum. In this embodiment, the equilateral triangle as the basic unit has a structure forming a regular quadrangular pyramid. That is, the four horizontal members 12a and 12b form a square, and the diagonal member 11 extends from each connection point of the four horizontal members 12a and 12b and is connected at the truss fulcrum. The horizontal position of the truss fulcrum is equal to the center position of the square in the four horizontal members 12a forming the square on the upper side. A portion where the upper ends of the diagonal members 11 are connected is called an upper end connection point.

As shown in FIGS. 1 and 2, the horizontal members 12a and 12b are broadly classified into a lower portion connected at each truss fulcrum and an upper portion connected at each upper end connection point. be. For the sake of convenience, the horizontal member 12a at the upper position is called the upper horizontal member, and the horizontal member 12b at the lower position is called the lower horizontal member. As shown in FIG. 2, the total area occupied by the connected lower horizontal members 12b is larger than the total area occupied by the connected upper horizontal members 12a. This point will be supplementarily explained using FIG. FIG. 3 is a schematic perspective view of the overall area occupied by the connected upper horizontal members and the overall area occupied by the connected lower horizontal members.

In FIG. 3, line L1 indicates the overall area occupied by the connected upper horizontal members 12a, and line L2 indicates the overall area occupied by the connected lower horizontal members 12b. A line L1 is a virtual line formed by the outermost upper horizontal member 12a. A line L2 is an imaginary line formed by the outermost lower horizontal member 12b.
As shown in FIG. 3, the total area occupied by the connected lower horizontal members 12b is larger than the total area occupied by the connected upper horizontal members 12a. In other words, the shape of the area occupied by the truss structure 1 as a whole corresponds to the shape of the lower side of the quadrangular pyramid cut horizontally at the middle height.

In such a truss structure 1, the diagonal member 11 and the horizontal members 12a and 12b can be made of various materials as long as the required rigidity can be obtained. In addition to metals such as rust-proof steel, lightweight steel frames, and aluminum, wood and resin can be used. As the resin material, a polyolefin-based material such as polyethylene or polypropylene can be used, and a material made of recycled waste material can also be used.

4 and 5 are schematic diagrams showing the connection of diagonal members and horizontal members. Although detailed illustration is omitted in FIGS. 1 and 2, a joint member 13 is usually used to connect the diagonal members 11 and the horizontal members 12a and 12b. FIG. 4(1) is a schematic front view showing an example of the joint material 13. FIG. FIG. 4(2) is a schematic perspective view showing connection using this joint material 13. As shown in FIG.

The joint member 13 has a shape having portions for fixing the respective ends of the diagonal members 11 and the horizontal members 12a and 12b according to the type of the truss structure 1. As shown in FIG. The joint material 13 shown in FIG. 4 is of a type fixed with a bolt 131 and a nut 132 and has a bolt hole 130 . The joint member 13 in the example shown in FIG. 4 has recesses 131 formed in the fixed portions, and the protrusions 101 at the ends of the diagonal members 11 and horizontal members 12a and 12b are inserted into holes 100 provided through the bolts. It has a structure to fasten with a nut 132 through 131 . The fixing portion of the joint member 13 may be a convex portion, and the ends of the diagonal members 11 and the horizontal members 12a and 12b may be concave portions. The joint member 13 shown in FIG. 4 has a portion for fixing the end portion of the vertical member so that it can be used also in the case of a Warren truss with vertical members, and the bolt hole 130 is also provided in this portion. ing. In the case of Warren truss joints without uprights, this part may not be provided.

In addition to the example shown in FIG. 4, a fitting connection can be employed as shown in FIG. The connection structure shown in FIG. 5 is preferably adopted in the case of a material having some elasticity such as resin, and the end portions of the diagonal members 11 and the horizontal members 12a and 12b are connected to the concave portion 131 formed in the joint member 13. The connection structure shown in FIG. A structure can be adopted in which the projection 101 is formed in an appropriate size and shape, and is pushed in and fitted in so as to be elastically connected with an appropriate strength. Similarly, the projections and recesses may be reversed.

As the top plate 2 provided on the upper side of the truss structure 1, a deck plate, a concrete slab, or the like can be used. For example, in the case of a deck plate, a QL deck plate having an embossed upper surface can be preferably adopted.
Incidentally, as shown in FIG. 1, a plate-shaped structural member (hereinafter referred to as a side plate) 3 is also provided on the outer peripheral portion of the truss structure 1 . A deck plate, a concrete slab, or the like can also be used for the side plate 3 .

Moreover, the truss structure 1 may be covered with a water impermeable sheet or a water permeable sheet as necessary. For example, if the truss structure 1 is made of metal, it is not preferable for rainwater to accumulate, so the space can be covered with a waterproof sheet to prevent rainwater from entering. On the other hand, when the truss structure 1 is made of resin or made of a highly corrosion-resistant material, it may be possible to positively permeate the truss structure 1 to promote penetration of rainwater. In this case, the truss structure 1 may be covered with a permeable sheet to prevent the entry of earth and sand.

The elevated site structure of the embodiment is specially devised in consideration of the load of the truss structure 1 . That is, as shown in FIG. 1, a resin block 4 for substituting the ground is disposed immediately below the position of each truss fulcrum in the truss structure 1 . In this embodiment, a resin block 4 made of non-foamed resin is employed.

FIG. 6 is a schematic diagram showing an example of a resin block for ground replacement, where (1) is a schematic plan view and (2) is a schematic front view. The resin block 4 is composed of a horizontal base portion 41 and leg portions 42 extending vertically from the base portion 41 . The base portion 41 has a square plate shape as a whole. An opening 40 is formed in the base portion 41 for weight reduction and the like.
A total of four legs 42 are provided at each corner of the square base portion 41 . The position of the leg portion 42 is slightly inside the edge of the corner. Each leg 42 is diagonally positioned and all the same distance from the corner edge.
Each leg portion 42 is a substantially prismatic portion as a whole. However, the inside of each leg 42 is hollow. Each leg 42 has the largest cross-sectional area at the portion connected to the base portion 41 , and the cross-sectional area gradually decreases as the distance from the base portion 41 increases. That is, it has a trapezoidal shape when viewed from the front. In the resin block 4, each leg 42 has the same height.

Such resin blocks 4 are usually used as a pair. 7 is a schematic front view showing the combination of the resin blocks shown in FIG. 6. FIG. As shown in FIG. 7, the ends of the legs 42 of the two resin blocks 4 are butted against each other and fitted together. As shown in FIG. 2, the upper end surface of each leg portion 42 is formed with a fitting projection (hereinafter referred to as fitting projection) 43 . The fitting projection 43 is a part for combination with another resin block 4 positioned above. As shown in FIG. 6( 1 ), two fitting projections 43 are formed on the upper end surface of each leg portion 42 . As shown in FIG. 6(1), each fitting projection 43 is provided on a diagonal line extending diagonally from the upper left to the lower right in the substantially square upper end surface shape of each leg 42 .

A fitting hole (hereinafter referred to as a fitting hole) 44 is formed in the upper end surface of each leg portion 42 . The fitting hole 44 is a hole into which the fitting projection 43 is fitted. Two fitting holes 44 are also provided in each upper end face. The fitting hole 44 is provided on a diagonal line in a direction from diagonally upper right to diagonally lower left when viewed in plan view. That is, on the upper end surface of each leg portion 42, each fitting hole 44 and each fitting protrusion 43 are arranged line-symmetrically. Therefore, as shown in FIG. 7(1), when the tips of the legs 42 are butted against each other, the fitting projections 43 on one side are fitted into the fitting holes 44 on the other side, whereby the two resin blocks 4 are joined together. connected vertically.

When combining two resin blocks 4 as described above, an end plate 400 is used for reinforcement. The end plate 400 is a member corresponding to the base portion 41 of the resin block 4 shown in FIG. 6(1). The end plate 400 has insertion projections 401 on the upper and lower sides, and the base portion 41 has insertion holes 48 into which the insertion projections 401 are inserted. As shown in FIG. 7, the insertion protrusion is inserted into the insertion hole 48, and the end portions of the base portion 41 of the resin block 4 are sandwiched so as to be connected to each other.

The example shown in FIG. 7 is an example in which one resin block layer is formed with two resin blocks 4, but there are cases where the resin block layer is formed with only one resin block 4. FIG. In this case, the resin block 4 is arranged so that the base portion 41 faces downward, and the end plate 400 is mounted horizontally with respect to the tip of the leg portion 42 . The end plate 400 is provided with openings into which the fitting projections 43 at the ends of the legs 42 are fitted.

In some cases, the leg portion 42 of one resin block 4 is fitted into the base portion 41 of the other resin block 4 . That is, although illustration is omitted, a base fitting hole is provided at a position on the same vertical line as the fitting protrusion 42 on the back surface of the base portion 41 of each resin block 4 (the surface on the side opposite to the leg portion 42). . Therefore, by fitting the fitting protrusion 43 of the leg portion 41 of the other resin block 4 into the base fitting hole, the resin blocks 4 can be vertically connected while maintaining the same posture.

One resin block layer formed of one or a plurality of resin blocks 4 in this way is provided for one truss fulcrum. When multiple resin blocks 4 are used, each resin block 4 is interconnected. For connection, the configuration disclosed in Japanese Patent Application Laid-Open No. 2016-145500 can be adopted. The plurality of resin blocks 4 are often arranged horizontally and connected to each other on the left and right sides, but may be arranged vertically and connected to each other on the upper and lower sides. In some cases, they are arranged vertically and horizontally and connected to each other.

Further, as shown in FIG. 1, between the lower joint member 13 forming the truss fulcrum and the resin block 4, a plate member (hereinafter referred to as an intermediate plate) 5 is laid as required. The intermediate plate 5 can be a replaboard (recycled plastic board), a concrete slab, or the like.
A resin block layer composed of resin blocks 4 is provided for one truss fulcrum and acts as ground replacement. In this case, a water-permeable sheet or the like may be provided so as to cover the resin block layer as a whole. By constructing the resin block 4 so as to allow rainwater to permeate, the resin block 4 can function as a rainwater storage permeation layer.

To supplement the effect of ground replacement, one or more resin blocks 4 as ground replacement materials occupy a rectangular parallelepiped space. At this time, one or two resin blocks 4 are much lighter than the weight of the space when the space is entirely filled with ground soil. For example, AE-1 sold by Nitto Geotechno Co., Ltd. (head office: Machida City, Tokyo) can be used as the resin block 4 in the embodiment. The weight is only about 5 kg.

Since the resin block 4 has the rigidity and strength required as a structural material while being light in weight, it can be used as a ground replacement material. That is, the load of the truss structure 1 and the structure provided on the truss structure 1 is transmitted to the ground via the truss fulcrum of the truss structure 1 . At this time, if there is no resin block 4, the load applied to the truss fulcrum is large, so the truss fulcrum portion (the joint material 11 on the lower side) tends to descend so as to be buried in the ground. In order to prevent this, a concrete structure such as a continuous foundation may be provided, but since the load is further increased, it is likely to cause ground subsidence if the ground bearing capacity is not high. On the other hand, in the embodiment in which the resin block 4 is provided as a ground replacement material, the difference in specific gravity between the resin block layer and the surrounding ground soil results in alleviating the load on the truss fulcrum, resulting in subsidence (unequal subsidence). ) are prevented.

Next, a site raising method for realizing such a raised site structure will be described. The following explanation is also an explanation of an embodiment of the invention of the site elevation method.
FIG. 8 is a schematic diagram of the site raising method of the embodiment. When realizing the raised site structure described above, as shown in FIG. 8(1), in the existing site, the positions where each truss fulcrum is located are dug down. The volume of the space of each recess 61 dug down is the volume of each resin block layer formed as ground replacement, and is the amount of ground replacement. This is determined according to the bearing capacity of the ground on the site. If the bearing strength of the soil is weak, each resin block layer becomes large, and therefore each concave portion 61 is also formed large.

Next, as shown in FIG. 8B, crushed stone 62 is laid on the bottom surface of each recess 61, and resin block 4 is placed thereon. A plurality of resin blocks 4 are arranged and connected to each other as needed. One or more resin blocks 4 form a resin block layer. Then, crushed stones 62 are filled in the gaps between the installed resin blocks 4 and the side surfaces of the recesses 61 to stabilize the resin blocks 4 . After that, an intermediate plate 5 is installed on each resin block 4 as necessary. Since the recesses 61 have the same depth and the resin block 4 has the same height, and the intermediate plates 5 have the same thickness, the intermediate plates 5 are positioned on the same plane.

Then, as shown in FIG. 8(3), the truss structure 1 is constructed so that the truss fulcrum is located on each intermediate plate 5 . That is, after the joint member 13 is placed on the intermediate plate 5 and the lower horizontal member 12b and the diagonal members 11 are connected thereto, the upper joint 13 and the upper horizontal member 12a are connected. Incidentally, there may be a case where the truss structure 1 assembled at another place is brought in and installed as it is.

Next, as shown in FIG. 8(4), the top plate 2 is installed so as to cover the upper horizontal member 12a of the truss structure 1. Next, as shown in FIG. Further, the side plate 3 is put on the outermost oblique member 11 to cover the truss structure 1 in a circumferential shape. The top plate 2 and the side plates 3 may be fixed to the truss structure 1, or may be simply installed without being fixed. Moreover, the spread top plates 2 may be fixed to each other, or the adjacent side plates 3 may be fixed to each other. For fixing, a method of bridging a small plate-shaped member and fixing with an anchor pin, riveting, or the like can be adopted. When fixing the top plate 2 and the side plates 3 to the truss structure 1, metal fittings for fixing are previously fixed to the upper horizontal member 12a and the outermost oblique member 11, and the top plate 2 is attached to the metal fittings. and the side plate 3 are fixed by riveting or the like.

When the top plate 2 and the side plates 3 are attached in this way, raising the site is basically completed. The subsequent process will be a process according to the use of the raised site. In the case of a park, the top plate 2 may be covered with a little soil 81, trodden down, and a lawn or the like may be planted. As for the side plate 3, a concrete retaining wall 82 may be constructed. FIG. 8(5) shows the structure for such an example application. When constructing a building such as a house, it is possible that concrete slabs are used as the top plate 2 and fixed to each other to form a mat foundation, and a continuous foundation is constructed thereon for foundation work. Instead of the concrete retaining wall 82, a wall reinforcing structure made of natural stone, interstitial stone, or the like may be employed. The use of natural stone or interlocking stone allows water to permeate into the truss structure 1 when the water level rises.

According to the site raising site structure of the embodiment and the site raising method of the embodiment, the space is secured by the truss structure 1 when raising the site. A raised site can be obtained without Since a large amount of earth and sand, crushed stone, etc. are not required, costs including transportation costs can be kept low. Since the load through each truss fulcrum is relieved by the resin blocks 4, ground subsidence of the site is effectively prevented, and it is particularly suitable for raising the site where the soil bearing capacity of the ground is weak.

Moreover, according to the method of assembling the truss structure 1 in advance at another place and carrying it to the construction site for installation, the construction period can be further shortened. In this case, truss structures in which about 10 to several tens of basic units are gathered can be pre-assembled and brought to a construction site, and connected at the construction site to form a large truss structure 1 that occupies a desired area. This is a suitable construction method when obtaining a raised site of a larger area.

As for the truss structure 1, other types than those described above may also be adopted. This point will be described below with reference to FIG. FIG. 9 is a schematic front view showing another example of the truss structure.
In the above embodiment, the truss structure 1 is a Warren truss without vertical members, but it may be a Warren truss with vertical members as shown in FIG. 9(1). Alternatively, it may be a Hau truss as shown in FIG. 9(2) or a Platt truss as shown in FIG. 9(3). In the case of a Hau truss or a Platt truss, it is preferable to have a line-symmetrical structure with respect to the center (the center of the entire truss structure 1) in the direction in which the horizontal members 12a and 12b extend.

Further, in the case of a Warren truss or Howe truss with vertical members, it is preferable to assemble the truss so that the diagonal member 11 on the outermost periphery extends obliquely upward toward the center side, as in the above-described embodiment. This is because a stable raised site can be obtained without requiring additional earth and sand, crushed stone, or the like. This point will be supplementarily described with reference to FIG. FIG. 10 is a schematic diagram showing an embodiment in which the outermost diagonal member 11 is oriented in the opposite direction.

In FIG. 10, the truss structure 1, which is a Warren truss without uprights, is employed, whereas the truss structure 1 shown in FIGS. 1 and 2 is upside down. The present invention can be implemented with such a truss structure 1, but the periphery of the truss structure 1 needs to be reinforced. That is, for example, it is necessary to form a bank 7 having a triangular cross-section in a circumferential shape with sand or crushed stone, install the truss structure 1 inside it, and reinforce the truss structure 1 with the bank 7 from the outside. As shown in FIGS. 1 and 9 (1) and (2), if the outermost diagonal member 11 extends obliquely upward toward the center side, reinforcement by the embankment 7 is not required, which shortens the construction period and shortens the construction period. Cost reduction is achieved.
When the truss structure 1 having an upside down structure as shown in FIG. 10 is adopted, a concrete retaining wall 82 or a water-permeable retaining wall made of natural stone, interstitial stone, or the like is provided on the side of the embankment 7 . Also, it is preferable to replace the ground with a resin block 4 as shown in FIG. 10 for the lower ends of these retaining walls.

In addition, the truss structure 1 may be formed of a plurality of layers, as appropriate, depending on the height required for raising the truss structure 1 in the above-described embodiment. This point will be described with reference to FIG. FIG. 11 is a schematic front view showing an example of a multi-layered truss structure.
In carrying out the present invention, a truss structure that is a warren truss with two or more layers as shown in FIGS. can be The same is true for other types of truss structures. Multiple layers of each type would have a horizontal member 12c at a level between the uppermost horizontal member 12a and the lowermost horizontal member 12b.

Furthermore, in carrying out the present invention, it is not necessary for all the truss structures to secure the raised space, and a part of the truss structure may secure the raised space. An example of this configuration will be described using FIG. FIG. 12 is a schematic front view showing an example in which a part of the truss structure secures a raised space.
FIG. 12(1) shows an example of a type in which the outermost diagonal member extends obliquely upward toward the center of the truss structure as shown in FIG. 1, in which a raised space is partially secured. FIG. 12(2) shows an example in which a raised space is partially secured in the upside down truss structure shown in FIG.

If the site is originally lower than the surrounding site 9, or if for some reason it is necessary to install the truss structure 1 in a state where the entire site is dug down a little, the configuration of each example shown in FIG. 12 is adopted. can be In this case, when complying with height restrictions after building a building such as a house or adjusting the raised height for other reasons, as shown in FIG. Make it a position in the middle of the height of the body 1. In this case, the portion of the truss structure 1 that is higher than the surrounding site 9 is the portion that secures the raised space.

1 truss structure 11 diagonal member 12a upper horizontal member 12b lower horizontal member 13 joint member 2 top plate 3 side plate 4 resin block 40 resin block layer 5 middle plate 61 concave portion

In order to solve the above problems, this specification discloses an invention of a method for raising a site and an invention of a raised site structure.
The site raising method according to the disclosed invention includes a truss construction step of providing a truss structure on the site before raising, and a top plate construction step of providing a top plate while covering the upper end of the truss structure, The truss construction process is a process of constructing the truss structure by combining diagonal members and horizontal members, in which the outermost diagonal members extend obliquely upward toward the center of the truss structure. .
In this site elevation method, before the truss construction process, a ground replacement process is performed to replace the ground of the site immediately below the position where each fulcrum in the truss structure is located. It is possible to have a configuration in which a resin block layer made of a resin block for replacing the ground occupies the recess formed by digging directly under the position where the is located.
In addition, this method of raising the site can have a configuration in which a plate-like member is arranged on the outer peripheral portion of the truss structure to cover the outer peripheral portion.
Further, the raised site structure according to the disclosed invention is a structure including a truss structure installed on the site surface before raising and a top plate covering the upper end of the truss structure . The body is formed by combining diagonal members and horizontal members, with the outermost diagonal members extending diagonally upward toward the center of the truss structure.
In addition, in this raised site structure, a resin block layer made of resin blocks for replacement of the ground is occupied in a recess formed by digging directly under the position where each fulcrum in the truss structure is located on the site before raising. can have a configuration in which is provided.
In addition, this raised site structure can have a configuration in which a plate-like member is arranged on the outer periphery of the truss structure to cover the outer periphery.

Claims (4)

A truss construction process for installing a truss structure on the site before raising the height;
A top plate construction step of providing a top plate in a state of covering the top end of a truss structure,
Before the truss construction process, a ground replacement process is performed to replace the ground of the site immediately below the position where each fulcrum in the truss structure is located,
The ground replacement process is a process in which recesses formed by digging directly under positions where each fulcrum of the truss structure is located are filled with a resin block layer made of resin blocks for ground replacement. Method. The truss construction step is a step of constructing the truss structure by combining diagonal members and horizontal members, in which the outermost diagonal members extend obliquely upward toward the center of the truss structure. The site raising method according to claim 1, characterized in that: A truss structure installed on the site before elevation,
A raised site structure comprising a top plate covering the upper end of a truss structure,
A resin block layer made of resin blocks for substituting the ground is provided on the site before raising the ground so as to occupy a recess formed by digging directly under the position where each fulcrum of the truss structure is located. Raised site structure. The truss structure is formed by combining diagonal members and horizontal members, and the outermost diagonal member extends obliquely upward toward the center of the truss structure. Raised site structure according to 3.

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