JP3292860B2 - Precast retaining wall insert and its manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a precast retaining wall insert which can be attached to an L-shaped precast retaining wall so that a protective fence can be attached to an upper end of the precast retaining wall, and a method of manufacturing the same.

[0002]

2. Description of the Related Art In the development of residential land, etc., a retaining wall is provided around the embanked land in order to prevent the collapse of the embankment. Since the height of the retaining wall is higher than the land outside the retaining wall, a protective fence is provided along the retaining wall to prevent a person from falling outside the retaining wall.

Conventionally, the above-mentioned retaining wall has been constructed by casting concrete on site or by stacking concrete building blocks. Recently, however, a precast concrete block has been manufactured in advance at a factory, and this block has been installed at the construction site. L-shaped precast retaining walls to be installed have become mainstream for reasons such as workability and quality stability. There are two ways to attach a protective fence along this retaining wall: a foundation block is installed inside the retaining wall, a support is erected on the foundation block, and a protective fence is attached to the support, or a reinforcing fence is attached to the retaining wall. Then, there is a method of stacking a lightweight concrete block on the streak, erecting a column in the hole of the lightweight concrete block, and attaching a protective fence to the column.

[0004]

However, both of the above two methods of attaching a protective fence require specialized skills,
There are problems that the construction cost increases and the construction takes a long time. Also, in the method of providing the foundation block inside the retaining wall, the land inside the protective fence is narrowed, and the effective use of the land is hindered. Therefore, there is a demand for a precast retaining wall having excellent workability and quality stability, and a method of easily attaching a protective fence to an upper end of the retaining wall by a method that does not require specialized skills.

Therefore, the inventor of the present invention embeds an insert fitting provided with a female screw on the inner surface of a cylindrical body in a precast retaining wall, installs the precast retaining wall, and then bolts through a plate provided at the lower end of the column. As a result of studying that it is possible to answer the above-mentioned request if a support post is erected by screwing it into the insert bracket and a protective fence is attached to this support column,
It turned out that it was inconvenient that if it was an individual, a support | pillar might rotate or an insert metal fitting would come off. Further, the inventor of the present invention has researched that it is possible to firmly erected a pillar without rotating if two insert brackets are embedded and the lower ends of the pillars are hung over the two insert brackets and attached. The two positions are often shifted by the time they are hardened, and it has been found that the support is difficult to attach.

Further, it has been found that when the insert is buried substantially on the center line of the upper surface of the precast retaining wall, it is difficult to mount the insert on the reinforcing bar provided in the precast retaining wall. Therefore, an object of the present invention is to attach a precast retaining wall to easily rotate a column without disturbing a reinforcing bar almost on a center line of an upper end of the precast retaining wall without requiring specialized skills. An object of the present invention is to provide a precast retaining wall insert which can be firmly attached so as not to be attached thereto, and a method of manufacturing the same.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and a precast retaining wall insert according to claim 1 is provided with a base plate and a female screw on an inner surface of a cylinder. And an anchor with a head having a laterally protruding head provided on the outer peripheral surface of the distal end of the rod-shaped body. At least two of the nuts are erected substantially on the center line of the surface of the base plate. The headed anchor portion protrudes from a position away from the vicinity of the center line on the back surface of the base plate.

[0008] In the precast retaining wall insert according to the first aspect, the headed anchor portion is provided on the back surface of the base plate at a position away from the vicinity of the center line. When inserting the base plate near the center line by inserting it into the mold when forming the precast retaining wall, the main and distribution bars provided in the mold of the precast retaining wall may interfere with the mounting. Because you can't.

Here, the position distant from the vicinity of the center line is
This includes positions that are so far apart that there is substantially no difference in operation. For example, if the headed anchor is mounted in contact with the center line, which is farthest from the center line and closest to the center line, the main reinforcement must be attached to the center line of the upper end face of the precast retaining wall. And the distribution bars must be located at a position shifted from the center line of the precast retaining wall by the radius of the main and distribution bars, and the main and distribution bars should be located almost at the center line of the upper end of the precast retaining wall. In this case, it is necessary to dispose the base plate at a position displaced from the center line of the precast retaining wall by the radius of the main reinforcement and the distribution muscle. However, even if this deviation occurs, there is no particular problem in the operation of the main muscle and the force-distributing muscle and the operation of the base plate. Therefore, this deviation is included in a position farther from the vicinity of the center line.

However, it is preferable that the main and distribution bars are provided as much as possible on the center line of the precast retaining wall, and that the base plate is also provided on the center line of the precast retaining wall. From such a meaning, it is desirable that the headed anchor portion protrude outward from a line separated from the center line by a radius of a main bar or a distribution bar used for the precast retaining wall on the back surface of the base plate.

When the anchor with the head of the precast retaining wall insert according to the first aspect is embedded in concrete and mounted, the anchor with the head is lowered from the head to the upper end surface of the precast retaining wall at an inclination of approximately 45 °. It has enough tensile force to peel off the conical concrete block surrounded by the inclined surface and the upper end surface. Therefore, the tensile force increases as the number of headed anchors increases and as the length of the headed anchors increases. However, it is inconvenient if it is too long. Further, when providing a plurality of headed anchor portions on the base plate, if the protrusions are provided at substantially the same distance from the head of the headed anchor portion to the base plate, the concrete blocks to be peeled do not overlap, and therefore, The tensile force is large and effective.

When manufacturing the precast retaining wall insert according to the first aspect, a nut portion is erected on the surface of the base plate and an anchor portion with a head is protruded on the back surface.
The nut may be erected or the headed anchor may be protruded.

However, a female screw is provided on the inner surface of the cylinder, and a laterally protruding round flange is formed on the inner surface of the cylinder, and the inner side of the circular flange is smaller than the round flange. Manufacture a nut part with a square flange with a size, insert this nut part into the square hole of the base plate from the side without the round flange, and insert the nut part into the base plate with the square flange inserted into the square hole. When the nut is fastened and the nut is provided on the surface of the base plate, the nut is idling because the square flange of the nut is in the square hole when the bolt is screwed into the nut and the support is attached. Not convenient. In addition, a head with a laterally projecting head is provided on the outer peripheral surface of the tip of the rod-shaped body, and a headed anchor portion provided with an externally projecting male screw on the opposite end surface is manufactured. When the male screw at the tip of the anchor is screwed in, the anchor can be easily protruded, which is convenient.

According to a second aspect of the present invention, there is provided a method for manufacturing a precast retaining wall insert fitting, wherein a female screw is provided on an inner surface of a cylinder, and a circular flange protruding laterally on an outer peripheral surface of one end is in contact with the inside of the circular flange. Manufacture a nut part with a square flange smaller than the round flange, a head protruding in the lateral direction is provided on the outer peripheral surface of the tip of the rod, and a male screw protruding in the axial direction is provided on the opposite end surface The anchor portion with the head is manufactured, and at least two square holes having a size that the square flange of the nut portion passes but the round flange does not pass are provided substantially on the center line of the plate body, and the vicinity of the center line of the plate body After manufacturing a base plate with a screw hole at a position where the headed anchor part can be attached at a more distant position, the male screw of the headed anchor part is screwed into the screw hole of the base plate and the base plate is screwed. An anchor with a head is protruded on the back, and a nut is Inserted from without flange side is for at least two upright nut portion on the surface of and secured to the nut portion to the base plate base plate in a state of inserting the Sumitsuba into square holes.

In the manufacturing method according to the second aspect,
The male screw of the anchor with a head is screwed into the screw hole of the base plate, and the anchor with the head is projected from the back of the base plate.After screwing the male screw, the tip is crimped with a rag or the like. It is preferable to widen the tip because the anchor portion does not come off from the base plate and can be firmly attached.

Further, in the manufacturing method according to claim 2,
The nut is inserted into the base plate from the side without the round flange, and the nut is fastened to the base plate with the square flange inserted into the square hole. There are various fastening methods in this case. For example, soldering may be performed or welding may be performed.
It is preferable that the corner portion) is swaged with a rag or the like and spread, so that it can be easily and instantaneously fixed.

The base plate used in the method for manufacturing the precast retaining wall insert according to the first aspect and the precast retaining wall insert according to the second aspect is attached to concrete. It is desirable to be attached. As described above, there are various methods for firmly attaching the base plate to the precast concrete. For example, a large number of irregularities may be provided on the surface of the base plate to increase the surface area to increase the adhesive strength. However, as described in claim 3, a through hole communicating from the front surface to the back surface is formed in the base plate. It is preferable that concrete is provided in this through hole.

That is, according to a third aspect of the present invention, there is provided a precast retaining wall insert fitting according to the first aspect or the precast retaining wall according to the second aspect, wherein the base plate is provided with a through-hole communicating from the front surface to the back surface. It is a manufacturing method of a wall insert fitting.

[0019]

The operation will be described while explaining an example of the method of using the precast retaining wall insert according to the first aspect. Insert the anchor with head on the back side of the base plate into the formwork of the precast retaining wall where the main bars and distribution bars are provided, and set the nut on the surface of the base plate upright from the formwork. After the center line of the plate is almost aligned with the center line of the upper surface of the form, concrete is poured into the form to produce a precast retaining wall. At this time, main bars and distribution bars are provided almost on the center line in the precast retaining wall mold, but the anchor with head on the back of the base plate projects to a position farther away from near the center line of the base plate. Since the base plate is provided, the base plate can be attached substantially along the center line on the upper surface of the formwork without being disturbed by the main bars and the distribution lines.

A base plate is attached to the precast retaining wall thus manufactured along a substantially center line of the upper end surface. Then, since at least two nut portions are erected substantially on the center line of the surface of the base plate, the plate provided at the lower end of the column is brought into contact with the at least two nut portions, and then the bolt is attached. Is screwed into the nut portion from above the support plate, whereby the support can be attached substantially on the center line of the precast retaining wall.

At this time, since at least two nut portions are provided on the base plate, unlike the conventional case where insert metal fittings having female threads are embedded one by one, the position of the nut portion does not move, The support can be easily installed.
Further, since this support is attached to at least two nut portions, it can be attached without rotating. afterwards,
A protective fence is attached to this support. When the protective fence is mounted on the precast retaining wall in this way, a head protruding in the horizontal direction is provided at the tip of the anchor with a head standing upright on the back of this base plate, so that the anchor The tensile force is extremely large, and the column can be firmly attached to the precast retaining wall.

If the base plate is provided with a through hole from the front surface to the back surface as in the third aspect of the present invention, concrete enters into the through hole when the precast retaining wall is manufactured. The mounting strength of the base plate is increased.

In the manufacturing method according to the second aspect, when the female screw of the headed anchor portion is screwed into the screw hole of the base plate, the female screw is easily separated from the back surface of the base plate from near the center line. A headed anchor portion can be protruded at the position. Furthermore,
When the tip of the anchor part is swaged with flap and the tip is expanded,
It can be easily and firmly attached so that it does not come off. Inserting at least two nuts into at least two square holes of the base plate from the side without the round flange, and fixing the anchor portion to the base plate with the square flanges inserted into the square holes, easily Precast retaining wall inserts can be manufactured. On this occasion,
When a part (for example, a corner portion) of the corner flange is swaged with a rag or the like and spread, it can be easily and instantaneously fixed.

[0024]

Next, embodiments of the present invention will be described. 1 to 3 show an embodiment of the present invention. FIG. 1 shows a precast retaining wall insert fitting, (a) is a plan view, and (b)
Is a partially cutaway front view, (c) is a side view, FIG. 2 is an explanatory view showing a state in which the precast retaining wall insert of FIG. 1 is assembled, and FIG. 3 is a precast using the precast retaining wall insert of FIG. It is explanatory drawing which shows the cross section of the principal part of a retaining wall.

1 to 3, reference numeral 1 denotes a precast retaining wall insert, and the precast retaining wall insert 1 includes a base plate 2, a nut 3, and a head anchor 4.
Consists of

The base plate 2 has, for example, a width of 38 mm and a length of 180
rectangular plate having a square of 17.5 mm on a side substantially on the center line along the length direction.
Are provided at a distance of 120 mm from each other. In addition, a diameter of 1 mm is drawn on a line parallel to the center line separated by 9 mm from the center line.
Two 2.5 mm screw holes 22 are provided at positions separated by 70 mm. Furthermore, on the center line, 10 mm from one end,
60mm ahead, 40mm ahead, 60m ahead
At positions m, through holes 23 each having a diameter of 10 mm are provided.

The nut 3 is, for example, a stainless steel cylinder having a total length of 37 mm, a length of 28.5 mm and a diameter of 15 mm.
mm cylindrical portion 31 and a diameter 25 provided at the tip thereof.
A round flange 32 having a length of 2 mm (thickness) 2 mm and a square flange 33 having a length of 17 mm and a length (thickness) of 6.5 mm provided on the inside of the round flange 32 are provided. This square tsuba 3
3 is a size through which the square hole 21 of the base plate 2 passes;
Reference numeral 2 denotes a size through which the square hole 21 does not pass. The cylindrical portion 31 is provided with a female screw that is screwed to the M12 bolt.

The headed anchor portion 4 has a total length of 51 m, for example.
A cylindrical part 4 with a diameter of 15 mm and a length of 35 mm
1 and a diameter of 20 m provided at the tip of the cylindrical portion 41.
m, a head 42 having a length (thickness) of 6 mm, and a diameter 12 m provided at an end on the opposite side of the cylindrical portion 41 so as to protrude in the axial direction.
m, a male screw 43 having a length of 10 mm. The male screw 43 is screwed into the screw hole 22 of the base plate 2. In this embodiment, two anchors 4 with heads are provided on one side of the center line of the base plate, but they may be provided on both sides of the center line.

Reference numeral 5 denotes a precast retaining wall having an L-shaped section composed of a rising portion 51 and a base portion 52. The precast retaining wall 5 has a main bar 6 and a distribution bar 61 inside the 120 mm thick rising portion 51 and base 52. And are buried. In addition, rising part 5
The main bar 6 provided in 1 has an upper end substantially on the center line, and is provided with a slight inclination inside the L-shape as it goes down. Further, the distribution muscle 61 is provided in a direction orthogonal to the main reinforcement 6, and the main reinforcement 6 and the distribution muscle 61 are connected and connected by a wire or the like.

Next, a method of manufacturing a precast retaining wall provided with the precast retaining wall insert and a method of using the same will be described. First, the base plate 2, the nut portion 3, and the headed anchor portion 4 are manufactured. Next, the screw hole 2 of the base plate 2
2, the male screw of the anchor 4 with a head is screwed in from below, the anchor 4 with a head is protruded from the back of the base plate 2, and the upper end is swaged with a rag to increase the diameter of the tip 45 to about 19 mm. Attach it firmly so that the headed anchor 4 does not come off.
Next, in a state where the nut portion 3 is inserted into the square hole 21 of the base plate 2 from the side without the round flange 32 and the square flange 33 is inserted into the square hole 21,
The corner of the square hole 21 is swaged with a wrench, the tip of the corner 35 is widened, the nut 3 is fixed to the base plate 2, and two nuts 3 are erected on the surface of the base plate 2.

Next, the anchor 4 with the head on the back surface of the base plate 2 is inserted into the formwork of the precast retaining wall 5 provided with the main reinforcing bars 6 and the distribution bars 61, and the nut on the front surface of the base plate 2 is provided. After the part 3 is erected from the formwork and the center line of the base plate 2 is almost aligned with the centerline of the upper surface of the formwork, concrete is poured into the formwork to manufacture the precast retaining wall 5. At this time, the main reinforcement 6 is located almost at the center line of the formwork of the precast retaining wall 5.
However, since the anchor portion 4 on the back surface of the base plate 2 is protruded at a position away from the center line of the base plate 2, the base plate 2 is Attached along approximately the center line of the top surface. Further, since the through hole 23 is provided in the base plate 2 from the front surface to the back surface, concrete enters into the through hole 23 and the mounting strength of the base plate 2 is large.

The precast retaining wall 5 thus manufactured is transported to the construction site and installed around the embanked land, and the plate provided at the lower end of the column is straddled on the upper surface of the two nut portions 3. After it is brought into contact with the column, the bolt is screwed into the nut portion 3 from above the plate of the column to mount the column. Then, since the nut portion 3 is erected substantially at the center line of the base plate 2, the column can be attached substantially at the center line of the precast retaining wall 5. Also, the nut part 3 is a precast retaining wall 5
Since it is erected on the top, the precast retaining wall 5
Unlike the conventional case where an insert having a female screw is embedded in the nut, the nut portion 3 can be provided substantially on the center line of the precast retaining wall 5 without being disturbed by the main reinforcement.

At this time, since at least two nuts are provided on the base plate 2, unlike the conventional case where insert metal fittings having female threads are embedded one by one, the nuts 3 are not provided.
Can be easily attached without moving the position. Further, since this support is attached to at least two nut portions 3, it can be attached so as not to rotate.
After that, a protective fence is attached to this support.

[0034]

As described above in detail, in the precast retaining wall insert according to the first aspect, the anchor with the head on the back surface of the base plate protrudes from a position away from the vicinity of the center line of the base plate. When casting precast retaining walls by pouring concrete into the formwork, the base plate can be mounted on the precast retaining wall without being disturbed by the main and distribution bars provided almost at the center line of the preform retaining wall formwork. Can be mounted along substantially the center line of the upper surface of the.

The precast retaining wall manufactured in this manner has a base plate attached along the center line of the upper end surface, and at least two nut portions are erected substantially at the center line of the base plate surface. By attaching the lower end of the support to the at least two nut portions while straddling the support, the support can be mounted substantially on the center line of the precast retaining wall.

Further, since at least two nut portions are provided on the base plate, unlike the conventional case in which insert metal fittings each having a female screw are buried one by one, the position of the nut portion does not move. The columns can be easily attached. In addition, since this support is attached to at least two nut portions, the support can be mounted so as not to rotate. After that, when a protective fence is attached to this support, the head of the anchor with the head on the back of the base plate has a head that protrudes in the lateral direction, so the tensile force of the anchor with the head is extremely large, Can be extremely firmly attached to the precast retaining wall.

If the base plate is provided with a through hole extending from the front surface to the back surface as in the third aspect of the present invention, concrete enters into the through hole when the precast retaining wall is manufactured. The mounting strength of the base plate is increased. Further, according to the manufacturing method described in claim 2, the precast retaining wall insert fitting according to claim 1 can be easily manufactured.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, in which (a) is a plan view of a precast retaining wall insert, (b) is a partially cutaway front view, and (c) is a side view.

FIG. 2 is an explanatory view showing a state where the precast retaining wall insert of FIG. 1 is assembled.

FIG. 3 is an explanatory view showing a main part of a precast retaining wall using the precast retaining wall insert of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Precast retaining wall insert metal fitting 2 Base plate 21 Square hole 22 Screw hole 23 Through hole 3 Nut part 31 Cylindrical part 32 Round flange 33 Square flange 4 Headed anchor part 41 Column part 42 Head 43 Male screw 5 Precast retaining wall 6 Main reinforcement 61 Distributors

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E02D 29/02 305 E04H 17/22

Claims (3)

(57) [Claims] 1. A base plate, a nut portion having a female screw provided on an inner surface of a cylinder, and a headed anchor portion having a laterally protruding head provided on an outer peripheral surface of a distal end portion of a rod-shaped body. At least two nut portions are erected substantially on the center line of the surface of the base plate, and the headed anchor portion is protruded from a position near the center line on the back surface of the base plate. Wall insert fittings. 2. A nut provided with a female screw on the inner surface of a cylinder, a round flange protruding laterally on the outer peripheral surface at one end, and a square flange smaller than the round flange in contact with the inside of the round flange. The rod-shaped body is provided with a head that is provided with a head protruding in the lateral direction on the outer peripheral surface of the distal end portion, and an anchor portion with a head provided with a male screw protruding in the axial direction on the opposite end surface. A position where at least two square holes are provided on the line, through which the square flange of the nut portion passes but the round flange does not pass, and the headed anchor portion can be attached at a position further away from near the center line of the plate. After manufacturing a base plate provided with screw holes, a male screw of a headed anchor part is screwed into a screw hole of the base plate, and a headed anchor part is protruded on the back surface of the base plate, and a corner of the base plate is formed. Insert the nut into the hole from the side without the round flange, and insert the nut into the base plate with the square flange inserted into the square hole. A method for manufacturing a precast retaining wall insert fitting, wherein at least two nut portions are erected on the surface of a base plate by being fixed to the base plate. 3. The method of manufacturing a precast retaining wall insert according to claim 1, wherein the base plate is provided with a through hole communicating from the front surface to the rear surface.