JP6521413B1 - Frame structure and construction method of underground beam bottom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a frame structure used for the underground beam bottom without eliminating the hollow of the underground beam bottom and removing the beam bottom form, and a construction method of the underground beam bottom using this frame structure I will provide a. A frame structure 10 for use in an underground beam bottom 1 constituting a bottom of an underground beam 22 connecting foundations 21, wherein the front wall 31 and a pair of side walls 32 form a U-shape in a plan view. , Each of the side wall portions 32 has a notch 321 at the lower end portion on the front wall portion 31 side to engage with the scrap box frame 42, and the frame body 3 has a root cut In the area, the notch 321 is engaged with the disposal frame 42 in a direction in which the front wall portion 31 is located within the disposal frame 42, and is installed at the upper end portion of the frame main body 3 Disposal conglomerate LC2 is formed. [Selected figure] Figure 6

Description

  The present invention uses a frame structure used at the bottom of an underground beam that forms the bottom of an underground beam that connects foundations such as foundation bases (footings) and independent foundations made of columns, and this frame structure The present invention relates to a construction method of the underground beam bottom portion which constitutes the bottom of the underground beam connecting the foundations.

  The underground beam method is used as a foundation of a structure such as a factory, a store or a house (see, for example, Patent Document 1). FIG. 13 shows an example of a foundation structure using a conventional underground beam method shown in Patent Document 1 and the like. In addition, in FIG. 13, the mode before removing the support bottom 92 which supports the beam bottom formwork 91 and the beam bottom formwork 91 is shown.

  As shown in FIG. 13, in the conventional foundation structure 90 using the underground beam method, a base disposal concrete (disposal concrete) LC1 is formed on the rooted bottom G1 and a foundation base portion 211 is formed on the base disposal concrete LC1. And a foundation (independent foundation) 21 composed of pillars 212 is provided. The foundations 21 are connected by the underground beams 22.

  In this underground beam construction method, first, a rooting process is carried out in the ground G for excavating a location where the foundation 21 is to be installed. Next, a waste container frame (not shown) is provided on the rooted bottom G1 and concrete is cast in the waste container frame to form a base waste container LC1. In addition, a beam bottom formwork 91 for supporting the underground beam 22 and an underground beam waste container LC2 are provided. The beam bottom formwork 91 is supported by the support 92 installed on the slope G2, and the underground beam disposal conglomerate LC2 is to cast concrete in a disposal conglomerate (not shown) provided on the ground G Formed by Then, the reinforcing bars and the formwork of each of the foundation 21 and the underground beam 22 are assembled, and concrete is cast in each formwork. Then, after curing for a predetermined period, the formwork is removed. Here, the beam bottom formwork 91 and the support 92 are removed after concrete of the beam bottom in the underground beam 22 reaches the design standard strength, and then the backfilling work is performed.

Unexamined-Japanese-Patent No. 5-311675

  However, in the conventional underground beam construction method, the space S is formed below the beam bottom mold 91, and it is difficult to backfill in the space S and perform a rolling operation. In general, water-tightening (work to harden the ground by adding water) has been carried out, but its effect has not been confirmed, and a cavity remains at the bottom of the underground beam below the underground beam 22. It can often be seen in some cases. For this reason, it may become a factor of ground subsidence in the future.

  In addition, the removal work of the beam bottom formwork 91 and the support 92 is troublesome, and one end of the beam bottom formwork 91 is placed on the underground beam disposal concrete LC2, so If LC2 is not damaged, the beam bottom formwork 91 can not be removed, and the operation becomes very complicated.

  Furthermore, although the formwork material corresponds to industrial waste, in many cases the period from placing concrete to the foundation 21 and underground beam 22 to backfilling can not be sufficiently secured in many cases, leaving the beam bottom formwork 91 There is also a possibility that backfilling work will be carried out as it is.

  In view of the above circumstances, the present invention eliminates the hollow of the underground beam bottom and eliminates the need to remove the beam bottom formwork. A frame structure used for the underground beam bottom and the underground using this frame structure It aims at providing the construction method of the beam bottom.

A frame structure in the present invention which solves the above object is a frame structure used at the underground beam bottom which constitutes the bottom of the underground beam which connects foundations,
A wire mesh frame body formed in a U-shape in a plan view by a front wall portion and a pair of side wall portions connected respectively at right angles to both end portions of the front wall portion,
Each of the pair of side wall portions has a notch at a lower end portion on the front wall portion side for engaging with a base disposal container frame provided with the foundation, and the frame main body is a root of the foundation The front wall portion is installed in the root cutting area defined by the cutting bottom and the slope in such a manner that the front wall portion is positioned within the disposal box, the notch is engaged with the disposal box,
The space formed by the frame body and the slope is filled with a filler,
In the upper end portion of the frame main body, an underground girder is formed.

  Here, the frame structure is provided with a fixing member such as a longitudinal bar or the like which is driven into the root cutting bottom and fixes the frame main body to the root cutting bottom or a separator for connecting the opposing longitudinal bars. It may be. In addition, the frame main body may be one in which crushed stone is filled on the bottom side of the ground beam disposal box. Furthermore, the frame main body may be constituted by a glass form.

  When the frame structure of the present invention is used for the underground beam bottom portion, for example, after filling the crushed stone in the frame main body and performing a rolling pressure, etc., the underground beam bottom portion is formed by forming the underground beam disposal box Can be eliminated. Along with this, water filling at the time of backfilling becomes unnecessary. Moreover, the conventional beam bottom formwork 91 (refer FIG. 13) becomes unnecessary. As a result, a complicated removal operation of the beam bottom formwork 91 becomes unnecessary, and there is no possibility that the backfilling operation is performed with the beam bottom formwork 91 remaining.

Further, in the mold of the present invention, the frame main body comprises a pair of mesh panels,
It is preferable that the front wall portion is configured by bending one end portion at right angles with respect to each of the pair of mesh panels and overlapping all or a part of the bent portion.

  By doing this, the frame main body can be configured by a simple member using a mesh panel used for a glass form or the like. Moreover, the space | interval of a pair of side wall part is easily adjustable by changing the overlap of the said bend | folded part.

Furthermore, in the formwork of the present invention, a support member driven into a root bottom in the frame main body;
The aspect provided with the connection member which connects the said support member and the said front wall part is also one of the preferable aspects.

  Here, the support member may be a U-shaped hook muscle or a longitudinal muscle. Further, the connecting member may be a number line or a wire.

  By adopting an aspect of supporting the front wall portion by the support member and the connection member, the strength of the front wall portion is improved, the frame main body is filled with crushed stone, and concrete is cast. Also, the bulging of the front wall can be suppressed. As a result, the distance between the front wall and the base can be maintained as desired.

The construction method of the underground beam bottom portion in the present invention which solves the above-mentioned object is the ground which constitutes the bottom of the underground beam which connects foundations using the frame structure according to any one of claims 1 to 3. It is the construction method of the middle beam bottom,
A rooting process to form a rooting area to set up the foundation;
In the rooted bottom formed by the rooting process, a waste container installation step of installing the waste container frame outside the base part of the foundation to be constructed later by a predetermined size,
A frame structure installation step of installing the frame structure by engaging the notch of the side wall portion with the waste container frame in a direction in which the front wall part is positioned within the waste container frame;
Crushed stone filling step of filling crushed stone to a position lower by a predetermined height than the upper end of the frame structure in the frame structure installed in the frame structure installing step;
A concrete is poured on the crushed stone filled in the frame structure by the crushed stone filling process to form a ground beam girder, and a concrete is poured in the waste container frame to form a base waste concrete. And providing an installation process.

  According to the construction method of the underground beam bottom portion in the present invention, since the crushed stone is filled in the frame main body in the crushed stone filling step, the hollow portion of the underground beam bottom portion can be eliminated. Along with this, water filling at the time of backfilling becomes unnecessary. Moreover, while the removal operation of a complicated beam bottom formwork becomes unnecessary, there is also no possibility that a backfilling operation may be performed while leaving the beam bottom formwork. In addition, since the foundation for the underground beam is formed up to the vicinity of the foundation by the placing process, the beam main reinforcement, the spacer, etc. for supporting the main reinforcement of the underground beam are located near the foundation. It can be installed. As a result, the main reinforcement of the underground beam becomes difficult to bend, and it becomes easy to secure the cover thickness of the underground beam bottom.

  Further, in the construction method of the underground beam bottom portion in the present invention, in the frame structure installation step, the support member is driven into a root cut bottom in the frame main body, and the support member and the front wall portion are connected by a connection member. It is preferable that it is a construction method including work.

  If this construction method is adopted, it becomes easy to maintain the distance between the front part wall and the foundation as desired.

  Still further, in the construction method of the underground beam bottom portion in the present invention, the construction method also includes a scrap box removal step of removing the scrap box frame engaged with the notch of the side wall portion after the casting step. Good.

  Since crushed stone is filled in the frame main body by the crushed stone filling step, the waste container frame can be easily removed.

  According to the present invention, it is possible to eliminate the hollow of the underground beam bottom and eliminate the need to remove the beam bottom form, a frame structure used for the underground beam bottom, and the underground beam bottom using this frame structure Can provide a construction method of

It is a flowchart which shows an example of the process about the construction method of the underground beam bottom of this invention. It is a perspective view for demonstrating the operation | work of the first half of the disposal container frame installation process in the construction method of the underground beam bottom part of this invention shown in FIG. It is a perspective view for demonstrating the operation | work of the latter half of the disposal container frame installation process in the construction method of the underground beam bottom part of this invention shown in FIG. It is a perspective view explaining the operation | work of the first half of the frame structure installation process in the construction method of the underground beam bottom part of this invention shown in FIG. It is a perspective view for demonstrating the operation | work of the second half of the frame structure installation process in the construction method of the underground beam bottom part of this invention shown in FIG. It is a perspective view which extracts and expands and shows one of the frame structures shown in FIG. It is a top view of the frame structure shown in FIG. It is a perspective view which shows the state which implemented the crushed stone filling process in the construction method of the underground beam bottom part of this invention shown in FIG. It is a perspective view which shows the state which implemented the placing process and the disposal container frame removal process in the construction method of the underground beam bottom part of this invention shown in FIG. It is a longitudinal cross-sectional view of the underground beam bottom part shown in FIG. It is a perspective view which shows the foundation structure which formed the foundation and the underground beam. It is a top view of FIG. It is a figure which shows an example of the foundation structure which used the conventional underground beam construction method shown to patent document 1 grade | etc.,.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present embodiment, an aspect in which the underground beam is connected from three sides to the foundation is described as an example, but the aspect to which the present invention is applied is not particularly limited. It may be an aspect in which the inside beam is connected, an aspect in which the underground beam is connected from two opposite sides to the foundation, or an aspect in which the underground beam is connected from two directions orthogonal to the foundation It is also good. In the following description, components having the same names as those of the components in the foundation structure using the conventional underground beam method shown in FIG. Descriptions may be omitted.

  FIG. 1 is a flowchart which shows an example of the process about the construction method of the underground beam bottom part of this invention. As shown in FIG. 1, the construction method of the underground beam bottom portion in the present embodiment includes rooting process S1, scrap container frame installation process S2, frame structure installation process S3, crushed stone filling process S4, and placing A process S5 and a scrap box removal process S6 are provided.

  FIG. 2: is a perspective view for demonstrating the operation | work of the first half of the disposal container frame installation process in the construction method of the underground beam bottom part of this invention shown in FIG. FIG. 3 is a perspective view for explaining the work in the latter half of the scrap container installation process in the method of installing the underground beam bottom portion of the present invention shown in FIG.

  First, similarly to the conventional underground beam construction method, rooting process S1 which digs the location which installs the foundation in the ground G is implemented. As a result, as shown in FIG. 2, rooted roots G1 and slopes G2 are formed. The area defined by the rooted root G1 and the slope G2 corresponds to the rooted area according to the present invention. Next, as shown in FIG. 2, a wood pile 41 is hit at the four corners of the place where the waste container frame 42 (see FIG. 3) is to be installed. Next, as shown in FIG. 3, the waste container frame 42 is installed in a rectangular shape based on the wood pile 41 and fixed to the wood pile 41 by nails or the like. The waste container frame 42 is a frame for placing the base waste container LC1, and the outer periphery of the base waste container LC1 has a predetermined dimension than the base base portion 211 (see FIG. 12) installed in the base waste container LC1. Install so as to be large (for example, 100 mm). Then, on the ground G, a pair of second waste container frames 43 are installed at predetermined intervals so as to be continuous with the ground surface G2. Similar to the conventional foundation structure 90 shown in FIG. 13, the second discard container frame 43 is for casting the underground beam waste container LC2.

  FIG. 4 is a perspective view for explaining the work of the first half of the frame structure installation step in the installation method of the underground beam bottom portion of the present invention shown in FIG. 1, and FIG. 5 is the underground beam of the present invention shown in FIG. It is a perspective view for demonstrating the operation | work of the second half of the frame structure installation process in the construction method of a bottom part.

  In frame structure installation process S3, as shown in FIG. 4, the notch 321 (refer FIG. 6) mentioned later in detail is made to engage with the container frame 42, and the frame main body 3 is installed in rooting area. Then, as shown in FIG. 5, the frame main body 3 is fixed using the longitudinal bars 51 or the like.

  Next, an example of a frame structure installation process and the frame structure of this invention is demonstrated in detail using FIG.6 and FIG.7.

  FIG. 6 is a perspective view showing one of the frame structures shown in FIG. 5 extracted and enlarged. FIG. 7 is a plan view of the frame structure shown in FIG. The frame structure shown in FIGS. 5 to 7 corresponds to an example of the frame structure of the present invention.

  As shown in FIG. 6 and FIG. 7, the frame structure 10 includes the frame main body 3, the vertical streaks 51, the hook streaks 53 and the score lines 54, and the separator 52 for fixing the frame main body 3 to the rooting bottom G1. Etc.

  The frame main body 3 is configured by a pair of mesh panels 30, 30 in the present embodiment. That is, the frame main body 3 is in the form of a wire mesh. The mesh panel 30 can adopt a general-purpose one used for a glass frame, and the end portion on the opposite side (the lower left in FIG. 6, the left in FIG. 7) of the slope G2 is perpendicular It bends and it fixes with the number line etc. in the state which accumulated one part of this bent part. Note that all of the bent portions may be overlapped. The wall portion including the overlapped portion is the front wall portion 31, and the frame main body 3 is a pair of side wall portions 32 and 32 which are continuous with the front wall portion 31 and both end portions of the front wall portion 31 at right angles. And are formed in a U-shape in plan view. By changing the overlap of the front wall portions 31, the width of the frame main body 3 (the distance between the pair of side wall portions 32, 32) can be easily adjusted. Each of the pair of side wall portions 32, 32 has a notch 321 at the lower end portion on the front wall 31 side, the notch 321 engages with the scrap box, and the front wall 31 is positioned in the scrap box 42 ing. In addition, the position which forms the notch 321 is set so that the distance d1 from the disposal container frame 42 to the front surface of the front wall part 31 may turn into predetermined distance (for example, 50 mm).

Also, each pair of side wall portions 32, the ends of the slopes G2 side bent portion 322 is returned Ri fold is formed. The work of forming the bent portion 322 is performed according to the distance d2 from the scrap box 42 to the lower end of the slope G2 shown in FIG. 6, the angle of the slope G2, etc. It suffices to bend the end. By doing this, the frame main body 3 can be easily made to correspond to the slope G2 formed in the rooting step S1.

  The side wall portion 32 is fixed to the root cutting bottom G1 by the longitudinal bars 51. Further, a separator 52 is bridged between the longitudinal bars 51 opposed in the width direction, and the distance between the pair of side wall portions 32, 32 is maintained at a predetermined level.

  A U-shaped hook muscle 53 is driven into the rooted root G1 in the frame main body 3, and the hook muscle 53 and the front wall portion 31 are connected by the number line 54. The hook line 53 corresponds to an example of the support member in the present invention, and the number line 54 corresponds to an example of the connection member in the present invention. Thereby, the strength of the front wall portion 31 is improved, and as described later, even if the frame main body 3 is filled with crushed stone and further concrete is cast, the expansion of the front wall portion 31 can be suppressed. In addition, the side wall portion 32 and the second discard box 43 are bound by a number line or the like as necessary.

  FIG. 8 is a perspective view showing a state in which the crushed stone filling step in the method of installing the underground beam bottom portion of the present invention shown in FIG. 1 is performed.

  In the crushed stone filling step S4, the crushed stone Cr is filled in the frame main body 3 of the frame structure 10 installed in the root cutting area, and the rolling is performed as necessary. Here, the crushed stone Cr is filled in such a manner that a space for placing the concrete of the underground beam disposal concrete LC2 (see FIG. 9) remains at the upper end portion of the frame main body 3. That is, the crushed stone filling step S4 is a step of filling the frame structure 10 installed in the frame structure installation step S3 with crushed stone to a position lower than the upper end of the frame structure 10 by a predetermined height. Crushed stone may be temporarily placed next to the place where the frame structure 10 is to be installed when the rooting process S1 is performed.

  FIG. 9 is a perspective view showing a state in which the placing step and the scrap box removal step are carried out in the method of installing the underground beam bottom portion of the present invention shown in FIG. 1.

  In the placing step S5, concrete is placed on the crushed stone Cr filled in the frame structure 10 in the crushed stone filling step S4, and concrete is also placed between the second scrap box frames 43 (see FIG. 3). After the predetermined curing period, the disposal container frame 42 and the second disposal container frame 43 (see FIG. 8) are removed, and as shown in FIG. 9, the base disposal container LC1 and the underground beam disposal container LC2 are formed. As a result, the underground beam bottom portion 1 including the frame structure 10, crushed stone Cr, and the underground beam disposal concrete LC2 is formed. In addition, although the underground girder consignment LC2 continues to the adjacent foundation, in FIG. 9, even the middle part of the underground girder consignment LC2 is shown.

  FIG. 10 is a longitudinal sectional view of the underground beam bottom portion shown in FIG. Note that FIG. 10 shows the state before performing the scrap box removal process.

  As shown in FIG. 10, since the lower part of the underground beam disposal concrete LC2 is filled with crushed stone Cr, it is formed under the beam bottom formwork 91 as in the conventional underground beam method shown in FIG. There is no need to backfill in the space S, and there is no risk of leaving a cavity that may be a factor of land subsidence in the future. In addition, since the waste container frame 42 is covered with crushed stone Cr, its removal operation becomes easy. Furthermore, as described above, since the front wall portion 31 of the frame main body 3 is supported by the hook muscle 53 and the score line 54, the forward bulging is suppressed.

  FIG. 11 is a perspective view showing a foundation structure in which a foundation and an underground beam are formed, and FIG. 12 is a plan view of FIG.

  The foundation structure 90 is formed by the same process as the conventional method, and therefore details thereof will be omitted. It is carried out by putting 22 rebars and formwork and placing concrete. Here, in the present embodiment, since the underground beam disposal concrete LC2 is formed up to the vicinity of the foundation 21, the main reinforcement of the underground beam 22 is supported at a position close to the foundation 21; Can be installed. As a result, the main reinforcement of the underground beam 22 becomes difficult to bend, and it becomes easy to secure the cover thickness of the underground beam bottom. Further, as shown in FIG. 12, the foundation base portion 211 is formed in a shape having a connecting portion 211 a that is connected to the underground beam disposal floor LC 2 by using the frame body 44 having the folded back portion 44 a. In the present embodiment, the thickness Th of the connecting portion 211a is set to 70 mm or less, and it is possible to cope with no streaks. If the thickness Th of the connecting portion 211a exceeds 70 mm, it is sufficient to attach an anthracite material (stuffing material) such as styrofoam (extruded foam polystyrene heat insulating material). Furthermore, if the thickness Th of the connection portion 211a can be made equal to or less than the thickness of the frame (for example, 30 mm or less), an L-shaped frame 44 'without a folded portion is used as shown by a circle in FIG. It is also possible to drive the foundation base portion 211. Thus, although it becomes important to set the position of the front wall 31 (see FIG. 10) of the frame main body 3 that constitutes the tip of the underground beam bottom 1, as described above, in the present embodiment, the hook streaks 53 and Since the front wall portion 31 is supported by the number lines 54, the expansion of the front wall portion 31 is suppressed. Moreover, as shown in FIG. 6, by engaging the disposal box 42 with the notch 321 of the frame main body 3, the distance d1 from the disposal box 42 to the front surface of the front wall 31 is a predetermined distance (for example, 50 mm) It is set. By these, position setting of the front wall part 31 becomes easy.

  Finally, backfill the rooting area. In the present embodiment, the beam bottom form 91 and the support 92 in the conventional conventional underground beam method shown in FIG. 13 are not used. For this reason, troublesome removal work becomes unnecessary. In addition, there is no possibility that the refilling operation is performed with the beam bottom form 91 left.

  According to the present invention, it is possible to eliminate the hollow of the underground beam bottom and eliminate the need to remove the beam bottom form, a frame structure used for the underground beam bottom, and the underground beam bottom using this frame structure Can provide a construction method of

  The present invention is not limited to the embodiments described above, and various modifications can be made within the scope of the claims.

Reference Signs List 1 underground beam bottom portion 10 frame structure 21 foundation 211 foundation base portion 211 a connecting portion 212 column 22 underground beam 3 frame main body 31 front wall portion 32 side wall portion 321 notch 322 bent portion 42 scrap box frame 43 second discard box 51 longitudinal bar 52 separator 53 hook bar (supporting member)
Line 54 (connection member)
90 foundation structure 91 beam bottom form 92 support G ground G1 rooted bottom G2 slope LC1 base disposal control LC2 ground beam for disposal concrete S space Cr crushed stone Th thickness S1 rooting process S2 disposal control frame installation process S3 frame Structure setting process S4 Crushed stone filling process S5 Placing process S6 Discard box removal process

Claims (6)

A frame structure used at the bottom of the underground beam that forms the bottom of the underground beam that connects foundations,
A wire mesh frame body formed in a U-shape in a plan view by a front wall portion and a pair of side wall portions connected respectively at right angles to both end portions of the front wall portion,
Each of the pair of side wall portions has a notch at a lower end portion on the front wall portion side for engaging with a base disposal container frame provided with the foundation, and the frame main body is a root of the foundation The front wall portion is installed in the root cutting area defined by the cutting bottom and the slope in such a manner that the front wall portion is positioned within the disposal box, the notch is engaged with the disposal box,
The space formed by the frame body and the slope is filled with a filler,
A frame structure characterized in that a ground beam waste container is formed at an upper end portion of the frame main body. The frame body comprises a pair of mesh panels,
2. The front wall portion according to claim 1, wherein one end portion of each of the pair of mesh panels is bent at a right angle, and all or a part of the bent portion is overlapped. Frame structure. A support member driven into the root cutting bottom in the frame main body;
The frame structure according to claim 1 or 2, further comprising: a connecting member connecting the support member and the front wall portion. It is a construction method of the underground beam bottom which constitutes the bottom of the underground beam which connects foundations using the frame structure according to any one of claims 1 to 3,
A rooting process to form a rooting area to set up the foundation;
In the rooted bottom formed by the rooting process, a waste container installation step of installing the waste container frame outside the base part of the foundation to be constructed later by a predetermined size,
A frame structure installation step of installing the frame structure by engaging the notch of the side wall portion with the waste container frame in a direction in which the front wall part is positioned within the waste container frame;
Crushed stone filling step of filling crushed stone to a position lower by a predetermined height than the upper end of the frame structure in the frame structure installed in the frame structure installing step;
A concrete is poured on the crushed stone filled in the frame structure by the crushed stone filling process to form a ground beam girder, and a concrete is poured in the waste container frame to form a base waste concrete. And D. a construction method of the underground beam bottom portion characterized by comprising:   5. The ground according to claim 4, wherein the frame structure installation step includes an operation of driving a support member into a root bottom of the frame main body and connecting the support member and the front wall portion by a connection member. Construction method of the middle beam bottom. The construction method of the underground beam bottom portion according to claim 4 or 5, further comprising: a waste container frame removing step of removing the waste container frame engaged with the notch of the side wall part after the placing step. .

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