JP2015001133A - Protection concrete body for digestion tank, and method for constructing protection concrete body for digestion tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a protection concrete body for a digestion tank, in which concrete bodies can be stacked without being misaligned, and a method for constructing the protection concrete body for the digestion tank.SOLUTION: A protection concrete body for a digestion tank includes: a first member 1 made of concrete configured substantially in a square shape in a planar view, and having a first hole 7 and a first step part 8 formed in a bottom face 4A thereof; and a second member 1A made of concrete arranged below the first member 1, configured substantially in the same shape as the first member 1, and having a second hole 17 facing the first hole 1 and a second step part 18 to be engaged with the first step part 8 formed in a top surface 4 thereof.

Description

  The present invention relates to a septic tank protecting concrete body and a construction method for a septic tank protecting concrete body. Specifically, the present invention relates to a septic tank protecting concrete body for protecting a septic tank buried in the ground from earth pressure and groundwater pressure, and a construction method for a septic tank protecting concrete body.

In flush toilets in areas where sewage treatment facilities are not directly connected to public sewers, septic tanks made of reinforced synthetic resins such as FRP are often used.
Although the septic tank formed from this reinforced synthetic resin is excellent in corrosion and durability, it is weak in rigidity.

Here, when the septic tank is buried in the ground, a sheet pile for earth retaining is placed around the ground to be excavated, and the ground in the inner region surrounded by the sheet pile is excavated.
Furthermore, the construction of the concrete body for protection of the septic tank which constructs a formwork in the inner periphery and inner bottom of an excavation hole, and casts concrete is performed.
However, in the construction of such a concrete body, when installing a septic tank in a narrow site such as a home, there is a problem that it takes time and effort for earth retaining work and formwork.

  In order to solve such a problem, there is a septic tank protecting concrete body described in Patent Document 1, for example. Specifically, as shown in FIG. 14, the concrete plate 102 serving as the protective concrete body 101 is divided and configured to be connectable with a connection plate (not shown).

  In the construction using the protective concrete body 101 having such a configuration, as shown in FIG. 15 (a), the ground 105 is aligned with the lowermost concrete plate 102 to the depth of the concrete plate 102. Excavate.

  Further, as shown in FIG. 15B, the lowermost concrete plate 102 divided into the excavation hole 106 is suspended by a crane to connect the divided concrete plates 102 to each other.

  Next, as shown in FIG. 16A, in a state where the lowermost concrete plate 102 is suspended by a crane, a lower portion of the inner region surrounded by the lowermost concrete plate 102 is below the next concrete plate 102. Dig down to height.

  Subsequently, as shown in FIG. 16 (b), the lowermost concrete plate 102 is dropped by a crane into an underground region dug down by an excavator or the like.

  Thus, the concrete board 102 is piled up while digging the lower part of the inner side area surrounded by the concrete board, and the concrete body for septic tank protection is constructed in the ground.

JP 2011-236666 A

  However, when the concrete body for septic tank protection described in Patent Document 1 is placed on the concrete plate built in the excavation hole while being suspended by a crane or the like, It takes a lot of work to put on without shifting.

  In addition, when placing the other concrete plate after placing one concrete plate, the concrete plate may be displaced again due to contact with one concrete plate due to work in a narrow place.

  The present invention has been made in view of the above points, and an object thereof is to provide a concrete body for septic tank protection that can be stacked without shifting the concrete body and a construction method for the concrete body for septic tank protection. Is.

  In order to achieve the above object, a concrete body for protecting a septic tank according to the present invention is configured in a substantially rectangular shape in plan view, and a first hole and a first step are formed on the bottom surface. A first member made of concrete and a first member disposed below the first member, configured in substantially the same shape as the first member, and facing the first hole on the top surface thereof And a second member made of concrete in which a second step portion that engages with the two hole portions and the first step portion is formed.

  Here, when the first member is configured in a substantially square shape in plan view, it is possible to secure a predetermined space in which the septic tank can be installed. In addition, the second member is configured in substantially the same shape as the first member. In other words, the second member is configured in a substantially square shape in plan view, and thus the same as the first member. In addition, it is possible to secure a predetermined space in which the septic tank can be installed.

Further, by engaging the first step portion and the second step portion, the first member and the second member can be stacked without shifting.
Furthermore, since the first hole portion and the second hole portion face each other, a linear pin joint or the like can be inserted into the first hole portion and the second hole portion, and both can be connected. The state in which the first member and the second member are engaged can be maintained.

  Further, when the top surface of the first member has a connecting portion provided with a screw hole into which the bolt can be screwed, the bolt for hanging with a crane or the like can be attached and detached.

  In addition, when the first member and the second member can be divided into a substantially U shape in plan view, they can be stacked individually and connected to each other in a divided state, enabling efficient building work It becomes.

  In addition, if the top surface of the first member has a holding portion provided with a screw hole into which the reinforcing bar can be screwed and provided with an interval longer than the length of the reinforcing bar to be arranged, bend in advance. The processed rebar can be screwed to the holding portion. Furthermore, when it has the reinforcing bar holding hole part formed between the holding parts, it becomes possible to insert the reinforcing bar previously bent into the reinforcing bar holding hole part after screwing the reinforcing bar into the holding part.

  Moreover, in order to achieve said objective, the construction method of the concrete body for septic tank protection based on this invention is comprised by substantially square shape in planar view, and the 2nd hole part and 2nd on the top | upper surface are comprised. Excavating the ground to approximately the same size as the second member made of concrete in which the step portion is formed, and building the second member in the excavation hole, and the second hole of the second member The first member made of concrete having a pin joint projecting into the part and configured in a substantially rectangular shape in plan view, and having a first hole and a first step formed on the bottom surface Inserting the pin joint into the first hole portion and stacking the first member and the second member by engaging the first step portion with the second step portion, And a step of connecting the second member and the second member in the vertical direction, and a region surrounded by the second member Square and drilled repeatedly ground immediately below the second member, darken the same first member and the second member in the ground, and a step of forming a concrete foundation on its inner bottom.

  Here, the ground is formed to be approximately the same size as the second member made of concrete in which the second hole portion and the second stepped portion are formed on the top surface while being configured in a substantially square shape in plan view. By excavating and installing the second member in the excavation hole, it is possible to secure a predetermined space where the septic tank can be installed in the ground.

Further, the pin joint is inserted into the second hole portion of the second member in a protruding state, and is configured in a substantially square shape in plan view, and the first hole portion and the first step portion on the bottom surface thereof. A pin joint is inserted into the first hole of the first member made of concrete, and the first step and the second step are engaged with the second step. By stacking the members, the first member and the second member can be stacked without shifting.
Furthermore, the state in which the first member and the second member are engaged is maintained by inserting a pin joint into the second hole portion of the second member and the first hole portion of the first member. Is possible.

  Further, by connecting the first member and the second member in the vertical direction, the first member and the second member can be stacked closely.

  Moreover, the ground below the area surrounded by the second member and directly below the second member are repeatedly excavated, the first member and the second member are dropped into the ground, and the concrete foundation is placed on the inner bottom thereof. By forming, it becomes possible to ensure the space part which can accommodate a septic tank in the ground.

According to the concrete body for protecting a septic tank of the present invention, the concrete body can be stacked without being displaced.
Moreover, according to the construction method of the concrete body for septic tank protection of this invention, it becomes possible to construct | assemble, building a concrete body in the ground, without shifting | deviating.

The perspective view (A) for demonstrating an example of the 1st member which comprises the concrete body for septic tank protection to which this invention is applied, and an example of the 2nd member which comprises the concrete body for septic tank protection to which this invention is applied It is a perspective view (B) for demonstrating. It is a cross-sectional schematic diagram for demonstrating the cross section in the case of laminating | stacking the 1st member and 2nd member which comprise the concrete body for septic tank protection to which this invention is applied. It is a schematic diagram for demonstrating the state which installs an eyebolt in the connection part in the 1st member of the concrete body for septic tank protection to which this invention is applied. It is a schematic diagram for demonstrating the flange for a connection of the concrete body for septic tank protection to which this invention is applied. The perspective view (A) for demonstrating an example of a middle stage concrete body when the concrete body for septic tank protection to which this invention is applied is made into three steps, and the 3rd member of the concrete body for septic tank protection to which this invention is applied It is a cross-sectional schematic diagram (B) for demonstrating a cross section. It is a front schematic diagram for demonstrating an example of the state which piled up the 1st member, 2nd member, and 3rd member of the concrete body for septic tank protection to which this invention is applied. It is a plane schematic diagram for demonstrating an example of the state which piled up the 1st member, the 2nd member, and the 3rd member of the concrete body for septic tank protection to which this invention is applied. It is a side surface schematic diagram for demonstrating an example of the state which piled up the 1st member, the 2nd member, and the 3rd member of the concrete body for septic tank protection to which this invention is applied. It is a schematic diagram for demonstrating the attachment state of the connection plate in the concrete body for septic tank protection to which this invention is applied. The schematic diagram (A) for demonstrating the excavation state in the 1st process of an example of the construction method of the concrete body for septic tank protection which applied this invention, and an example of the construction method of the concrete body for septic tank protection which applied this invention It is a schematic diagram for demonstrating the state which builds the 2nd member as the lower stage in a 1st process. The schematic diagram (A) for demonstrating the built-in state of the 3rd member as a middle step in the 2nd process of the example of the construction method of the concrete body for septic tank protection to which this invention is applied, and septic tank protection to which this invention is applied It is a schematic diagram (B) for demonstrating the excavation state in the 2nd process of an example of the construction method of the concrete body for construction. Schematic diagram (A) for explaining the built-in state of the first member as the upper stage in the third step of an example of the construction method of the concrete body for septic tank protection to which the present invention is applied, and septic tank protection to which the present invention is applied It is a schematic diagram for demonstrating the excavation state in the 3rd process of an example of the construction method of the concrete body for buildings. Schematic diagram for explaining a state of laying a foundation concrete plate in the fourth step of an example of a construction method for a septic tank protecting concrete body to which the present invention is applied, and a construction method for a septic tank protecting concrete body to which the present invention is applied. It is a schematic diagram for demonstrating the state which installs the septic tank in the 4th process of an example. It is a schematic diagram for demonstrating an example of the conventional concrete body for septic tank protection. It is a schematic diagram for demonstrating the starting state in an example of the construction method of the conventional concrete body for septic tank protection. It is a schematic diagram for demonstrating the construction state in an example of the construction method of the conventional concrete body for septic tank protection.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<First Embodiment>
FIG. 1A is a perspective view for explaining an example of a first member constituting a septic tank protecting concrete body to which the present invention is applied, and FIG. 1B is a septic tank protecting concrete body to which the present invention is applied. The perspective view for demonstrating an example of the 2nd member to comprise is shown.
Moreover, FIG. 2 shows the cross-sectional schematic diagram for demonstrating the cross section in the case of laminating | stacking the 1st member and 2nd member which comprise the concrete body for septic tank protection to which this invention is applied.

The concrete first member 1 shown here is configured so as to be divided into a substantially U-shape in plan view.
For example, a first concrete comprising a folded region (A, A) formed from a concrete plate having a height of about 600 mm and a thickness of about 80 mm, and a main region B between the folded regions (A, A). It consists of a frame body part 2 and a second concrete frame body part 3.

  Here, in the first concrete frame body portion 2 and the second concrete frame body portion 3, the main region B has a length of about 2,160 mm, and the bent regions (A, A) have a length of about 730 mm. is there.

  Moreover, the both side end surfaces (9, 9) of the first concrete frame body portion 2 and the both side end surfaces (9A, 9A) of the second concrete frame body portion 3 are configured to be connectable. By connecting the both side end faces (9, 9) of the first concrete frame body part 2 and the both side end faces (9A, 9A) of the second concrete frame body part 3 thereby, a substantially square shape in plan view. The 1st member 1 comprised by this is formed.

  Also, a connecting portion 5 provided with a screw hole like an anchor is integrally formed in the vicinity of the corners of the top surfaces (4, 4) of the first concrete frame portion 2 and the second concrete frame portion 3. It is buried in. As shown in FIG. 3, the connecting portion 5 is configured such that an eyebolt 6 suspended by a crane or the like can be screwed together.

  Moreover, the holding | maintenance part provided in the top surface (4, 4) of the 1st concrete frame body part 2 and the 2nd concrete frame body part 3 with the screw hole which can screw in the edge part of the rebar for slab concrete 23 is arrange | positioned by the space | interval more than the length of the reinforcing bar for slab concrete to be arranged.

  Further, a reinforcing bar holding hole 19 into which an end of the reinforcing bar can be inserted is disposed between the holding part 23 and the holding part 23.

  On the other hand, the 1st hole part 7 is pierced in the bottom face (4A, 4A) of the 1st concrete frame part 2 and the 2nd concrete frame part 3 (refer FIG. 2).

  Moreover, the 1st level | step-difference part 8 is formed along the longitudinal direction of the bottom face (4A, 4A) of the main area | region B of the 1st concrete frame part 2 and the 2nd concrete frame part 3 (FIG. 2).

  Further, as shown in FIG. 4, the groove 11 is opened at the upper and lower positions of the both end surfaces (9, 9) of the first concrete frame body portion 2 and faces the both end surfaces (9, 9) in the groove 11. The connecting flange 12 having the bolt insertion hole 13 opened is attached.

  Furthermore, the groove portions 11A corresponding to the groove portions 11 at the upper and lower positions of the both side end surfaces (9, 9) of the first concrete frame body portion 2 at the upper and lower positions of the both side end surfaces (9A, 9A) of the second concrete frame body portion 3. Is open.

  A connecting flange 12A having a bolt insertion hole 13A opened to face both side end surfaces (9A, 9A) is mounted in the groove 11A.

  Here, the flanges for connection (12, 12A) are obtained by abutting the both side end faces (9, 9) of the first concrete frame body part 2 with the both side end faces (9A, 9A) of the second concrete frame body part 3. The bolt insertion holes (13, 13A) are overlapped.

  By inserting the fastening bolt 24 into the bolt insertion hole (13, 13A) of the connecting flange (12, 12A) and fastening with the nut 14, the first concrete frame body part 2 and the second concrete frame The body part 3 is connected.

  Further, upper and lower plate insertion grooves (16, 16) are formed on the bottom surfaces of the inner wall surfaces (15, 15) of the corners of the first concrete frame body portion 2 and the second concrete frame body portion 3.

  An insert 10 having a screw hole in which a bolt can be screwed is embedded in the bottom surface of the upper and lower plate insertion groove portions (16, 16).

  Further, as shown in FIG. 1B, the second member 1A made of concrete is, for example, a folded region (A, A formed from a concrete plate having a height of about 600 mm and a thickness of about 80 mm. ) And a main region B between the bent regions (A, A), and a first concrete frame portion 2A and a second concrete frame portion 3A.

  In the first concrete frame portion 2A and the second concrete frame portion 3A, the length of the main region B is about 2,160 mm, and the length of the bent regions (A, A) is about 730 mm.

  Further, both end surfaces (9, 9) of the first concrete frame portion 2A and both end surfaces (9A, 9A) of the second concrete frame portion 3A are configured to be connectable. As a result, by connecting the both end surfaces (9, 9) of the first concrete frame body portion 2A and the both end surfaces (9A, 9A) of the second concrete frame body portion 3A, a substantially rectangular shape in plan view. The 2nd member 1A comprised in this is formed.

  Further, as shown in FIG. 3, for example, screw holes are provided in the vicinity of the corners of the top surfaces (4, 4) of the first concrete frame portion 2A and the second concrete frame portion 3A as shown in FIG. The connecting part 5 thus formed is integrally embedded, and an eyebolt 6 suspended by a crane or the like can be screwed into the connecting part 5.

  Moreover, the 2nd hole 17 is perforated in the top | upper surface (4, 4) of 2 A of 1st concrete frame parts and the 2nd concrete frame part 3A.

  Furthermore, the 2nd level | step-difference part 18 is formed along the longitudinal direction of the top | upper surface (4, 4) of the main area | region B of 2 A of 1st concrete frame parts and the 2nd concrete frame part 3A.

  Further, as described in detail in FIG. 4, the groove 11 is opened at the upper and lower positions of the both end surfaces (9, 9) of the first concrete frame body portion 2A, and the both end surfaces (9, 9) are formed in the groove 11. The connection flange 12 having a bolt insertion hole 13 opened to face is attached.

  Furthermore, the groove part 11A corresponding to the groove part 11 of the up-and-down position of the both-ends end surface (9, 9) of the 1st concrete frame part 2 in the up-and-down position of the both-ends end face (9A, 9A) of the 2nd concrete frame part 3A. Is open.

  A connecting flange 12A having a bolt insertion hole 13A opened to face both side end surfaces (9A, 9A) is mounted in the groove 11A.

  Here, the flanges for connection (12, 12A) are obtained by abutting the both side end faces (9, 9) of the first concrete frame portion 2A and the both end faces (9A, 9A) of the second concrete frame portion 3A. The bolt insertion holes (13, 13A) are overlapped.

  By inserting the fastening bolt 24 into the bolt insertion hole (13, 13A) of the connecting flange (12, 12A) and fastening with the nut 14, the first concrete frame body portion 2A and the second concrete frame The body part 3A is connected.

  Further, upper and lower plate insertion groove portions (16A, 16A) are formed on the top surface side of the inner wall surfaces (15, 15) of the corners of the first concrete frame portion 2A and the second concrete frame portion 3A. .

  An insert 10 having a screw hole in which a bolt can be screwed is embedded in the upper and lower plate insertion groove portions (16A, 16A).

  Next, FIG. 5 (A) is a perspective view for explaining an example of the middle stage when the concrete body for septic tank protection to which the present invention is applied is a lower stage, a middle stage, and an upper stage, and FIG. 5 (B) is an application of the present invention. The cross-sectional schematic diagram for demonstrating the cross section of the 3rd member of the concrete body for septic tank protection which was done is shown.

  The concrete third member 1B shown here includes, for example, a folding region (A, A) formed from a concrete plate having a height of about 600 mm and a thickness of about 80 mm, and a folding region (A, A ) Between the first concrete frame body portion 2B and the second concrete frame body portion 3B.

  As for this 1st concrete frame part 2B and the 2nd concrete frame part 3B, the length of the main body area | region B is about 2,160 mm, and the length of a bending area | region (A, A) is about 730 mm.

  Moreover, the both side end surfaces (9, 9) of the first concrete frame body portion 2B and the both side end surfaces (9A, 9A) of the second concrete frame body portion 3B are configured to be connectable. As a result, by connecting the both end surfaces (9, 9) of the first concrete frame body portion 2B and the both end surfaces (9A, 9A) of the second concrete frame body portion 3B, the substantially rectangular shape in a plan view. A third member 1B configured as described above is formed.

  Further, as shown in FIG. 3, screw holes are provided in the vicinity of the corners of the top surfaces (4, 4) of the first concrete frame portion 2B and the second concrete frame portion 3B, as shown in FIG. The connecting portion 5 is integrally embedded, and an eyebolt 6 suspended by a crane or the like can be screwed into the connecting portion 5.

  Further, the first concrete frame body part 2 and the second concrete frame body part 3 have the top surfaces (4, 4) of the first concrete frame body part 2B and the second concrete frame body part 3B. A second hole 17A corresponding to the hole 7 is perforated.

  Furthermore, along the longitudinal direction of the top surface (4, 4) of the main region B of the first concrete frame body portion 2B and the second concrete frame body portion 3B, the first concrete frame body portion 2 and the second concrete frame body portion 2B A second step portion 18A corresponding to the first step portion 8 of the concrete frame portion 3 is formed.

  Further, the second holes of the first concrete frame body portion 2A and the second concrete frame body portion 3A are formed in the bottom surfaces (4A, 4A) of the first concrete frame body portion 2B and the second concrete frame body portion 3B. A first hole 7A corresponding to the portion 17 is perforated.

  Furthermore, along the longitudinal direction of the bottom surfaces (4A, 4A) of the main region B of the first concrete frame body portion 2B and the second concrete frame body portion 3B, the first concrete frame body portion 2A and the second concrete frame A first stepped portion 8A corresponding to the second stepped portion 18 of the frame body portion 3A is formed.

  Further, as described in detail in FIG. 4, the groove 11 is opened at the upper and lower positions of the both end surfaces (9, 9) of the first concrete frame body portion 2B, and both end surfaces (9, 9) are formed in the groove 11. The connection flange 12 having a bolt insertion hole 13 opened to face is attached.

  Furthermore, the groove part 11A corresponding to the groove part 11 of the up-and-down position of the both-ends end surface (9, 9) of the 1st concrete frame part 2 in the up-and-down position of the both-ends end face (9A, 9A) of the 2nd concrete frame part 3B. Is open.

  A connecting flange 12A having a bolt insertion hole 13A opened to face both side end surfaces (9A, 9A) is mounted in the groove 11A.

  Here, the flanges for connection (12, 12A) are obtained by abutting the both side end faces (9, 9) of the first concrete frame portion 2B and the both end faces (9A, 9A) of the second concrete frame portion 3B. The bolt insertion holes (13, 13A) are superposed.

  By inserting the fastening bolt 24 into the bolt insertion hole (13, 13A) of the connecting flange (12, 12A) and fastening with the nut 14, the first concrete frame body portion 2B and the second concrete frame body Part 3B is connected.

  In addition, upper and lower plate fitting grooves (16, 16) are formed on the bottom surfaces of the inner wall surfaces (15, 15) of the corners of the first concrete frame body portion 2B and the second concrete frame body portion 3B.

  An insert 10 having a screw hole in which a bolt can be screwed is embedded in the upper and lower plate insertion groove portions (16, 16).

  In addition, upper and lower plate insertion groove portions (16A, 16A) are formed on the top surfaces of the inner wall surfaces (15, 15) of the corners of the first concrete frame portion 2B and the second concrete frame portion 3B. .

  An insert 10 having a screw hole in which a bolt can be screwed is embedded in the bottom surface of the upper and lower plate insertion groove portions (16A, 16A).

  Next, FIG. 6: shows the front schematic diagram for demonstrating an example of the state which piled up the 1st member, 2nd member, and 3rd member of the concrete body for septic tank protection to which this invention is applied. FIG. 7: shows the plane schematic diagram for demonstrating an example of the state which piled up the 1st member, 2nd member, and 3rd member of the concrete body for septic tank protection to which this invention is applied. FIG. 8: shows the side surface schematic diagram for demonstrating an example of the state which piled up the 1st member, the 2nd member, and the 3rd member of the concrete body for septic tank protection to which this invention is applied.

  The concrete body 26 for septic tank protection shown here is composed of a first member 1 as an upper stage, a second member 1A as a lower stage, and a third member 1B as an intermediate stage.

  The concrete body 26 for protecting the septic tank is composed of a concrete plate having a substantially square shape in a plan view having a height of about 1,800 mm, a length of about 2,160 mm, and a width of about 1,460 mm.

Here, the second hole portion 17 formed on the top surface of the second member 1A as the lower step and the first hole portion 7A formed on the bottom surface of the third member 1B as the middle step are pin joints. 20 are connected.
In addition, the second step portion 18 formed on the top surface of the second member 1A as the lower step and the first step portion 8A formed on the bottom surface of the third member 1B as the middle step are engaged with each other. The
As a result, the third member 1B as the middle stage can be stacked on the second member 1A as the lower stage.

Further, the second hole portion 17A formed on the top surface of the third member 1B as the middle step and the first hole portion 7 formed on the bottom surface of the first member 1 as the upper step include the pin joint 20. Connected with
Further, the second step portion 18A formed on the top surface of the third member 1B as the middle step and the first step portion 8 formed on the bottom surface of the first member 1 as the upper step are engaged with each other. The
As a result, the first member 1 as the upper stage can be stacked on the third member 1B as the middle stage.

  Further, as shown in FIG. 9, the connecting plate 21 is fitted into the upper and lower plate insertion groove 16 of the third member 1B facing the upper and lower plate insertion groove 16A of the second member 1A as the lower stage.

The connecting plate 21 has a long hole at a position corresponding to the insert (10, 10) provided with a screw hole into which a bolt drilled in the bottom surface of the upper and lower plate insertion groove (16, 16A) can be screwed. (22, 22) are penetrating.
The fastening bolts (24, 24) are inserted into the elongated holes (22, 22) and screwed into the inserts (10, 10) provided with screw holes in which the bolts can be screwed.

  Accordingly, the second member 1A as the lower stage and the third member 1B as the middle stage are connected in an overlapped state.

  In this way, the third member 1 </ b> B as the middle stage and the first member 1 as the upper stage are similarly coupled by the coupling plate 21.

  Moreover, as shown in the said FIG. 7, in the holding | maintenance part 23 pierced by the top | upper surface (4, 4) of the 1st concrete frame part 2 and the 2nd concrete frame part 3 of the 1st member 1, Reinforcing bar 25 having a screw (not shown) cut at the base end is screwed.

  The reinforcing bars 25 are bent substantially at right angles near the base, and can be easily screwed by inserting the base end into the holding portion 23 and turning it.

  In addition, since the space | interval with the holding | maintenance part 23 is made more than the full length of the reinforcing bar 25, even if it uses the reinforcing bar 25 bent in a substantially right angle beforehand, it can be rotated without trouble.

  After the reinforcing bar 25 is screwed to the holding part 23 in this way, the base part is close to the reinforcing bar holding hole part 19 on the top surfaces (4, 4) of the first concrete frame part 2 and the second concrete frame part 3. The base end of the reinforcing bar 25A bent at a substantially right angle is inserted.

  As a result, it is possible to perform bar arrangement for a mold for a lid (not shown) for closing the opening of the first member 1.

  In the present embodiment, the top surface of the first member has a connecting portion that can be screwed with a bolt, but it is not always necessary to have a connecting portion.

  However, it is desirable to provide a connecting part that can easily attach and detach the eyebolt in that the work is performed while being suspended by a crane or the like.

  Further, in the present embodiment, the first member and the second member can be divided into substantially U shapes in plan view, but it is not always necessary to be able to be divided.

  However, it is desirable that the first member and the second member can be moved or stacked by a crane or an operator in view of the efficiency of the work.

  Further, in the present embodiment, the top surface of the first member has a holding portion that is installed with an interval equal to or longer than the length of the reinforcing bar, and a reinforcing bar holding hole formed between the holding portions. However, it is not always necessary to have the holding portion and the reinforcing bar holding hole portion.

  For example, it is possible to perform bending after inserting a reinforcing bar into the top surface of the first member at the site, but it is better in terms of work efficiency to attach with a reinforcing bar that has been previously bent. It can be said that. Therefore, it is desirable to provide a holding portion that is installed with an interval longer than the length of the reinforcing bar to be arranged and a reinforcing bar holding hole portion formed between the holding portions.

  Moreover, in this Embodiment, although the concrete body for septic tank protection by 3 steps | paragraphs of a 1st member, a 2nd member, and a 3rd member is explained in full detail, it is not necessarily required to set it as three steps | paragraphs.

  For example, two or four stages may be used depending on the size of the septic tank.

  When the first member, the second member, and the third member are stacked, the septic tank protecting concrete body of the present invention having the above-described configuration is provided with the first step portion or the second step portion on the surfaces facing each other. Stacking is possible without shifting by engaging the parts.

  Further, by inserting a pin joint into the first hole portion and the second hole portion of the first member, the second member, and the third member that face each other, the first member, the second member, It is possible to maintain the engagement.

  Thereby, it is possible to easily connect the first concrete frame body part and the second concrete frame body part and the first member, the second member, and the third member in the vertical direction. Become.

<Second Embodiment>
Next, an example of the construction method of the concrete body for septic tank protection using the concrete body for septic tank protection to which this invention is applied is explained in full detail below.

  FIG. 10A is a schematic diagram for explaining the excavation state in the first step of an example of the construction method of the concrete body for septic tank protection to which the present invention is applied, and FIG. 10B is septic tank protection to which the present invention is applied. The schematic diagram for demonstrating the state which builds the 2nd member as a lower stage in the 1st process of an example of the construction method of the concrete body for buildings is shown.

[First step]
First, as shown in FIG. 10 (A), using a heavy machine (not shown) or the like on the ground D, the same depth and length as the height of the second member (not shown) as the lower stage. The ground is excavated to the same length and width as the width to form the excavation hole E.

  Next, as shown to FIG. 10 (B), after connecting the 1st concrete frame part 2A and the 2nd concrete frame part 3A, and assembling the 2nd member 1A, a crane (not shown). ), Etc. while suspending in the excavation hole E.

  FIG. 11 (A) is a schematic diagram for explaining a built-in state of the third member as the middle stage in the second step of an example of the construction method of the septic tank protecting concrete body to which the present invention is applied, FIG. ) Shows a schematic diagram for explaining the excavation state in the second step of an example of the construction method of the concrete body for protecting septic tank to which the present invention is applied.

[Second step]
As shown in FIG. 11A, the pin joint 20 is inserted into the second hole 17 provided in the top surface 4 of the second member 1A in a protruding state.
Here, the first concrete frame portion 2B of the second member 1A is suspended while the first concrete frame portion 2B constituting the third member 1B as the middle stage is suspended by a crane (not shown) or the like. Move up. Subsequently, the pin joint 20 inserted into the second hole 17 of the first concrete frame 2A is inserted into the first hole 7A provided on the bottom surface of the first concrete frame 2B. And stack up.

  In this way, the second concrete frame portion 3B is also stacked on the second concrete frame portion 3A of the second member 1A. Furthermore, the 3rd member 1B is built on the 2nd member 1A by connecting the 1st concrete frame part 2B and the 2nd concrete frame part 3B.

  Subsequently, as shown in FIG. 11 (B), the second member 1A and the second member 1A are excavated below the area surrounded by the second member 1A and the third member 1B and directly below the second member. The third member 1B is dropped into the ground.

  FIG. 12 (A) is a schematic diagram for explaining the built-in state of the first member as the upper stage in the third step of an example of the construction method of the concrete body for septic tank protection to which the present invention is applied, FIG. ) Shows a schematic diagram for explaining the excavation state in the third step of an example of the construction method of the concrete body for protecting septic tank to which the present invention is applied.

[Third step]
As shown in FIG. 12A, the pin joint 20 is inserted in a state of protruding into the second hole 17A provided on the top surface 4 of the third member 1B.
Here, the first concrete frame body portion 2 constituting the first member 1 as the upper stage is suspended by a crane (not shown) or the like on the first concrete frame body portion 2B of the third member 1B. Move to. Subsequently, the pin joint 20 inserted into the second hole 17A of the first concrete frame 2B is inserted into the first hole 7 provided on the bottom surface of the first concrete frame 2. And stack up.

  In this way, the second concrete frame portion 3 is also stacked on the second concrete frame portion 3B of the third member 1B. Furthermore, the 1st concrete frame part 2 and the 2nd concrete frame part 3 are connected, and the 1st member 1 is built on the 3rd member 1B.

  Subsequently, as shown in FIG. 12B, the second member 1A and the second member 1A are excavated below the area surrounded by the second member 1A and the third member 1B and directly below the second member. The third member 1B and the first member 1 are dropped into the ground.

  Further, the second member 1A, the third member 1B, and the first member 1 are connected in the vertical direction by a connecting plate plate (not shown) to construct the concrete body 26 for septic tank protection.

  FIG. 13 (A) is a schematic diagram for explaining a state in which a foundation concrete plate is laid in the fourth step of an example of a construction method of a septic tank protecting concrete body to which the present invention is applied, and FIG. 13 (B) is a diagram illustrating the present invention. The schematic diagram for demonstrating the state which installs the septic tank in the 4th process of an example of the construction method of the concrete body for septic tank protection to which is applied is shown.

  As shown in FIG. 13 (A), the crushed stone F is laid on the inner bottom of the excavation hole E, the unevenness of the ground D is leveled, and the concrete G is placed smoothly on the upper surface of the crushed stone F. A foundation concrete plate H produced in advance on the upper surface of the concrete G is suspended by a crane and installed to form a concrete foundation for installing the septic tank I.

  As shown in FIG. 13B, a septic tank I made of FRP (fiber reinforced plastic) is installed on the upper surface of the foundation concrete plate H and fixed horizontally. Subsequently, the space around the septic tank I is filled with high-quality soil J that does not contain solid matter, a reinforcing bar is placed on the upper surface, a formwork is constructed, and concrete is placed to form the lid K. .

  In the construction method of the concrete body for septic tank protection according to the present invention having the above-described configuration, each time the second member, the third member, and the first member are stacked, the second member is surrounded by the height of the second member, the third member, and the first member. The work can be easily performed by excavating the ground below the region and directly below the second member.

  Further, the pin joint is inserted into the second hole portion, and the first member, the second member, and the third member are stacked so that the first step portion engages with the second step portion. The pin joint can be inserted into the first hole without fail without fail.

  Thereby, it is possible to easily connect the first concrete frame body part and the second concrete frame body part and the first member, the second member, and the third member in the vertical direction. Become.

DESCRIPTION OF SYMBOLS 1 1st member 1A 2nd member 1B 3rd member 2, 2A, 2B 1st concrete frame part 3, 3A, 3B 2nd concrete frame part 4 Top surface 4A Bottom face 5 Connection part 6 Eyebolt 7 7A First hole 8, 8A First step 9, 9A Both end faces 10 Insert 11, 11A Groove 12, 12A Connecting flange 13, 13A Bolt insertion hole 14 Nut 15 Inner wall 16, 16A Inserting upper and lower plates Groove parts 17 and 17A Second hole parts 18 and 18A Second step part 19 Reinforcing bar holding hole part 20 Pin joint 21 Connecting plate 22 Long hole 23 Holding part 24 Fastening bolts 25 and 25A Reinforcing bar 26 Concrete body for septic tank protection

Claims (5)

A first member made of concrete having a substantially square shape in plan view and having a first hole and a first step formed on the bottom surface thereof;
The second hole portion disposed below the first member and configured in substantially the same shape as the first member, and facing the first hole portion on the top surface and the first step A concrete body for protecting a septic tank, comprising: a second member made of concrete formed with a second stepped portion that engages with the portion. The concrete body for septic tank protection according to claim 1, wherein the top surface of the first member has a connecting portion provided with a screw hole into which a bolt can be screwed. The first member can be divided into a substantially U shape in plan view,
The concrete body for septic tank protection according to claim 1, wherein the second member can be divided into a substantially U shape in a plan view. The top surface of the first member is installed between the holding portions and a holding portion provided with a screw hole into which the reinforcing bars can be screwed and provided with an interval longer than the length of the reinforcing bars to be arranged. The concrete body for septic tank protection according to claim 1, comprising a reinforcing bar holding hole. Excavating the ground to approximately the same size as the second member made of concrete in which the second hole portion and the second stepped portion are formed on the top surface, and is configured in a substantially square shape in plan view, Building the second member in the excavation hole;
The pin joint is inserted into the second hole portion of the second member in a protruding state, and is configured in a substantially rectangular shape in plan view, and the first hole portion and the first step portion are formed on the bottom surface thereof. The pin joint is inserted into the first hole portion of the formed first member made of concrete, and the first step portion and the second step portion are engaged with each other by the second step portion. A process of stacking the members of
Connecting the first member and the second member in a vertical direction;
The ground below the region surrounded by the second member and directly below the second member is repeatedly excavated, the first member and the second member are dropped into the ground, and concrete is added to the bottom of the ground. The construction method of the concrete body for septic tank protection provided with the process of forming a foundation.

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