JPH06264453A - Precast concrete-made permanent form for foundation, and foundation practice using its form - Google Patents

Abstract

PURPOSE:To heighten work efficiency for constructing structural foundations, by a method wherein two vertical walls with a height required are allowed to intersect with each other and are formed almost in the shape of a letter L at plan-view. CONSTITUTION:Two vertical walls 7, 7 with a height required, which can be stored in a foundation ditch 1, are allowed to intersect with each other and are formed almost in the shape of a letter L at in the plan-view, and reinforcements are properly arranged therein, and thus a precast concrete-made form member 6 is formed. After that, the members 6 are suspended on the upper face of leveling concrete 5 on the foundation ditch 1 and the sides of the walls 7, 7 are arranged facing to each other. Auxiliary plates each are put on steel plates laid in the walls, in the vicinity of parts where the sides of the walls 7, 7 face to each other, and the walls 7, 7 are connected with each other by welding. After that, earth and sand are backfilled around the peripheral part of the members 6 and reinforcements are properly arranged at the inside of a permanent form for a foundation, following which main reinforcements 4 for a pile 3 are connected with main reinforcements for a column and concrete is placed therein. In this way, assembly of concrete-placing panels and removal thereof are made unnecessary and working efficiency can be heightened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a precast concrete scrap frame member suitable for constructing a construction foundation, and a construction method for constructing a construction foundation using the scrap frame member.

[0002]

2. Description of the Related Art Conventionally, when constructing a foundation, a square or rectangular formwork is constructed by arranging a concrete formwork veneer plate called a control panel in a foundation groove excavated at a construction site where the foundation is to be formed. However, a method has been performed in which the concrete is placed in the mold after the reinforcement is arranged, and after the concrete is hardened, the mold is removed and the earth and sand are backfilled. However, this method requires much work such as assembling and dismounting the formwork, and since wood, which is a natural resource, is heavily used, it cannot be said to be a preferable method from the viewpoint of environmental protection.

Therefore, it has been attempted to pile up a lightweight block at the site of the foundation or to substitute a wire mesh having fine meshes in place of the mold made of a control panel, but the method of stacking a lightweight block is different from that of a plywood board. Similarly, there is a problem that it takes a lot of time and, if the pile height is large, it may not be able to withstand the earth pressure of the backfilled earth and sand and may collapse. In addition, in the method of substituting with wire mesh etc., it is indispensable to additionally install a support means for supporting the wire mesh etc. so as to withstand the load when placing concrete, and also to refill the earth and sand immediately after setting the wire mesh etc. However, there is a problem in that it is difficult to improve the working environment in the process of constructing the foundation because it is necessary to backfill after the post-cast concrete has been set and cured. On the other hand, for pillars and beams, precast concrete was developed in place of the general control panel formwork, and there are some examples of construction.However, for construction foundations, no precast concrete formwork members are found. As a matter of fact, the basic construction method using the formwork member has not been developed.

[0004]

As described above, in the conventional foundation construction method, it has not been attempted to use a form member made of precast concrete, and it takes a lot of time and money to construct the foundation. There was a problem. Therefore, the present invention solves the above-mentioned conventional problems, and efficiently uses it for construction by using a precast concrete scrap frame member and the scrap frame member that have the advantage of saving labor and saving natural resources even in the foundation. The purpose is to provide a foundation construction method that enables the foundation to be constructed.

[0005]

Means for Solving the Problems To elaborate the constitution of the present invention for achieving the above object, the invention according to claim 1 is
A formwork member for setting up a base scraping frame which is set in a foundation groove formed by excavation at a place where a foundation is to be constructed and has a rectangular or rectangular shape when viewed from a plane, and the formwork member is required. A precast concrete waste formwork for a foundation, characterized in that two vertical walls having a height are made orthogonal to each other and are formed into a substantially L-shape when viewed from a plane.
The invention according to claim 1 is the precast concrete waste formwork for a foundation according to claim 1, wherein the ground-side end of the formwork member is provided with a brim-shaped leg. Further, in the invention according to claim 3, the widthwise dimension of either one of the two hanging walls of the form member is longer than the dimension of the other hanging wall in the widthwise direction. 1 or claim 2 is a precast concrete waste formwork for a foundation according to claim 2, and the invention according to claim 4 has a foundation groove formed by excavation at a place where a foundation is to be constructed,
Using a formwork member made of precast concrete that is almost L-shaped when viewed from the plane where two vertical walls having the required height are orthogonal to each other, a basic formwork that is rectangular or rectangular when viewed from the plane After that, after filling the surrounding sand and sand with the surrounding earth and sand around the foundation, the appropriate reinforcement is applied to the inside of the foundation scrap, and then concrete is placed to construct the foundation. This is the basic construction method using the precast concrete scrap formwork.

In order to obtain a rectangular basic formwork from a plan view by assembling the formwork members, two vertical walls forming the formwork members are made to have the same dimension in the width direction, and four molds are provided. It suffices if the end faces of the vertical walls of the frame member are butted against each other,
In addition, in order to obtain a rectangular basic formwork,
The widthwise dimension of one of the vertical walls,
The other vertical wall may be formed to be longer than the widthwise dimension, and four formwork members may be set so that the end surfaces of the longer vertical wall are abutted against each other. When constructing an underground girder, form a notch for placing the underground girder on a precast concrete formwork member so that the underground girder is constructed at the same time as the foundation is constructed. It is also possible.

In this way, the precast concrete scrap frame of the present invention is formed by making two vertical walls having a required height orthogonal to each other and forming a substantially L-shape in plan view. In addition to being able to stand on the bottom of the foundation groove, it will not collapse due to earth pressure even if the surrounding sand and sand are backfilled immediately after the foundation formwork is assembled. Further, in the case of the basic construction method using the formwork member according to the present invention, it is not necessary to assemble the control panel as in the conventional case, and therefore the labor for breaking and removing the control panel after hardening of the post-cast concrete is unnecessary. Immediately after assembling the foundation waste formwork with the precast concrete formwork member, it is possible to refill the surrounding earth and sand with the surrounding earth and sand.
It is possible to show sufficient resistance even if the load of post-cast concrete is applied.

[0008]

EXAMPLES The concrete construction of the precast concrete waste formwork for foundation of the present invention and the foundation construction method using the waste formwork will be described in detail below with reference to the embodiments shown in the drawings. 1 is a perspective view showing an embodiment of a precast concrete formwork member, FIG. 2 is a cross-sectional view of a state in which a basic waste form is set in a base groove, and FIG. 3 is an underground form of the basic waste form of FIG. FIG. 4 is a plan view showing a state in which a beam is set and earth and sand are backfilled, and FIG. 4 is a plan view showing an example of a case where a rectangular basic waste formwork is formed by using a precast concrete formwork member.

In the figure, reference numeral 1 denotes a foundation groove formed by excavation at a place where a foundation is to be constructed, and a head of a pile 3 which is previously driven into the ground 2 projects into the foundation groove 1. Reference numeral 4 is a main bar arranged in the pile 3, and reference numeral 5 is a waste concrete placed in the bottom portion of the foundation groove 1 so as to surround the head of the pile 3. Reference numeral 6 is a precast concrete formwork member to be assembled on the upper surface of the waste concrete 5 in the foundation groove 1, and the formwork member 6 has two vertical walls having a required height that can be accommodated in the foundation groove 1. Make 7 and 7 orthogonal, and see from the plane
Although it is formed in a mold shape, the inside thereof is appropriately reinforced, although not particularly shown. In addition, the two hanging walls 7, 7
By making this the same in the width direction,
As shown in FIG. 3, by assembling four form members 6, a square basic scrap frame can be formed.
Further, one of the two hanging walls 7, 7 of the formwork member 6 is formed so that the dimension in the width direction of the hanging wall 7 is longer than the dimension of the other hanging wall 7 in the width direction. By connecting the end faces of the hanging wall 7 to each other, it is possible to form a basic scrap frame which is rectangular as seen in a plane as shown in FIG.

Reference numeral 8 denotes a brim-shaped leg portion projecting from the ground-side end of the mold member 6, and the leg portion 8 improves the stability when the mold member 6 is set in the base groove 1. In addition to acting, it also acts as a kind of rib to reinforce the form member 6. In addition, even if the leg portion 8 is not projected, the form member 6
Needless to say, since it has an L shape, it does not hinder its independence. Each of the formwork members 6 of the embodiment shown in FIGS. 1 to 3 is formed with a notch 10 for mounting the end of the underground beam 9. The notch 10 is an underground beam. It goes without saying that there is no need to provide it in the case of a foundation that does not need to be provided. Reference numeral 11 in FIG. 3 indicates a main beam of the underground beam 9. Although not shown, metal plates are embedded at appropriate intervals at the abutting portions of the end faces of the vertical walls 7 forming the form member 6, and an auxiliary plate is attached to the metal plates during assembly to weld them together. However, it goes without saying that, in addition to the welding means, conventionally known fastening means such as bolts and nuts may be used to connect the form members 6 to each other.

Next, the basic construction method using the above-mentioned precast concrete form member 6 will be described. First,
The formwork member 6 is lifted by a crane or the like on the upper surface of the waste concrete 5 in the foundation groove 1 formed by excavation at a place where a foundation is to be constructed, and the end faces of the hanging walls 7, 7 are arranged so as to abut each other. Since the mold member 6 is L-shaped, it can be self-supporting, and on the upper surface of the scrap concrete 5, it is possible to form an accurate square or rectangular basic scrap frame in plan view. Then, the auxiliary plates are attached to the metal plates embedded in the vicinity of the abutting portions of the hanging walls 7, 7 and welded to connect the adjacent hanging walls 7, 7 to each other. Immediately after the completion of this work, the surrounding earth and sand should be backfilled with the surrounding sandbags. At this time, the pressure of the backfilled earth and sand is applied to each of the formwork members 6 forming the basic waste formwork. However, since each of the formwork members 6 has the L shape as described above, On the other hand, it exhibits sufficient resistance. When the brim-shaped leg portion 8 is projected from the ground-side end portion of the form member 6, even greater resistance to earth pressure can be obtained.

After the surrounding earth and sand is backfilled on the outer side of the basic waste formwork, the inside of the basic waste formwork constituted by the form members 6, 6, 6, 6 is appropriately arranged in the conventional manner ( (Not shown), the main bar 4 protruding from the head of the pile 3 and the column main bar (not shown) are fastened together, and then concrete is driven into the inside of the foundation formwork. At the time of this post-cast concrete placing, the load of the concrete is applied to the vertical wall of the basic waste formwork, but since the earth and sand are backfilled in the outer peripheral part of the basic waste formwork as described above, the pressure of the earth and sand is Since it will support the load on the basic formwork, there will be no problem. It should be noted that when the reinforcing bar is arranged inside the basic scrap frame, a method of arranging a separately manufactured reinforcing bar cage (not shown) in the basic scrap frame as in the conventional method may be used. Nor. Thus, the hardening of the concrete cast inside the foundation formwork results in the construction of a solid construction foundation.

[0013]

EFFECTS OF THE INVENTION The precast concrete waste formwork for foundation of the present invention and the foundation construction method using the waste formwork have the above-mentioned configurations and functions, and the work of removing and assembling the control panel becomes unnecessary on site. Sex is greatly improved. Also, since the formwork member made of precast concrete is used, wood that is a natural resource is unnecessary,
It is also preferable from the viewpoint of environmental protection. In addition, since the formwork member that forms the basic waste formwork is L-shaped when viewed from the top, it can stand on its own in the foundation groove, and it shows a large resistance even if pressure of the earth and sand backfilled around it is exerted. There is no need to attach support means to the. In addition, since the surrounding earth and sand can be backfilled immediately after the formwork member is set in the foundation groove to form the foundation waste formwork, the working environment is improved and the backfilled earth and sand is post-cast concrete. Since it has a function of supporting the load of, it is possible to smoothly perform the foundation work.

The L-shaped precast concrete formwork member according to the present invention exerts a great effect even when used in constructing a double slab. That is, L
A rectangular or rectangular scrap frame unit is assembled by assembling a mold frame member on the foundation slab, and the scrap frame units are continuously arranged at predetermined intervals, and a beam bar is provided between each unit. It is possible to construct a double slab very easily and rationally by arranging the bars and setting the column bars near the corners between each unit and forming the synthetic slab made of precast concrete on the top surface. It is possible.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a precast concrete formwork member.

FIG. 2 is a cross-sectional view of a state in which a formwork member is set in a foundation groove to form a foundation waste formwork.

FIG. 3 is a plan view showing a state in which an underground girder is set in a foundation scrap frame and earth and sand are backfilled.

FIG. 4 is a plan view showing an example of the case of forming a rectangular basic formwork using a precast concrete formwork member.

[Explanation of symbols]

 1: Foundation groove 2: Ground 3: Pile 4: Main bar 5: Waste concrete 6: Formwork member 7: Vertical wall 8: Leg 9: Underground beam 10: Notch 11: Beam main bar

Claims (4)

[Claims] 1. A formwork member for setting in a base groove formed by excavation at a place where a base is to be constructed to form a base scrapping frame having a rectangular shape or a rectangular shape when seen from a plane. The frame member is a precast concrete waste formwork for a base, characterized in that two vertical walls having a required height are made orthogonal to each other and are formed into a substantially L-shape when viewed from the plane. 2. The precast concrete waste formwork for a foundation according to claim 1, wherein the ground-side end of the formwork member is provided with a brim-shaped leg part. 3. A widthwise dimension of one of the two vertical walls of the form member is longer than a widthwise dimension of the other vertical wall. Precast concrete waste formwork for foundation as described in. 4. A mold made of precast concrete that is almost L-shaped when viewed from a plane formed by orthogonally arranging two vertical walls having a required height in a base groove formed by excavation at a place where a foundation is to be constructed. Using the frame member, construct a basic scrapping frame that is rectangular or rectangular in plan view, and then backfill the surrounding earth and sand in the outer periphery of the basic scrapping frame, and then inside the basic scrapping frame. A foundation construction method using a precast concrete waste formwork, characterized in that the foundation is constructed by placing concrete after placing the bars appropriately.