JPH07233529A - Anchor head construction - Google Patents

Abstract

PURPOSE:To obtain an anchor head holding a perpendicular surface always against the direction of a tensile member by forming the anchor head of a pedestal borne on a bearing section placed by contacting with a bedrock and a clamping member binding the basic end of the tensile member passing through the pedestal. CONSTITUTION:An excavated hole H is provided in a bedrock G forming an earth retaining of an H shape steel S1, and after the front end of a tensile member 3 is fixed to the excavated hole H, the basic end passes through an opening 1a of a pedestal 1 mounted to the steel S1. After that, the tensile member 3 passes through an opening 2b of a bearing plate 2, a recessed curve 2a is slide along a projected sphere of the pedestal 1, and the tensile member 3 is clamped with a clamping metal fixture 4 to fix. Then, in the case a perpendicular surface against the direction of the tensile member 3 is not held by a directional error of the excavated hole H in the bedrock G or finish accuracy of a fixed surface of the anchor head, the projected curve 2a is slid along the projected sphere of the pedestal 1, and the tensile member 3 is tentioned in the direction matching to directions of the tensile member 3 and excavated hole H.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anchor head structure for tensioning and fixing a tension member in an anchor construction method.

[0002]

2. Description of the Related Art Conventionally, a pedestal supported by a pressure receiving portion of a ground is made of a steel plate so that a tip end is inserted into a hole drilled in the ground in the anchor method and the base end of the anchor material is fixed. It is composed only of combination members, concrete boards, or steel plates.

[0003]

However, the pedestal surface in the above conventional structure holds a surface which is not necessarily perpendicular to the pulling direction due to the error in the direction of the hole for inserting the tensile member, the finishing accuracy of the anchor head fixing surface, and the like. do not do. In such a case, if the tension member is fixed by combining the conventional pedestal and bearing plate, the tension surface of the anchor does not intersect perpendicularly with the tension member. The actual anchoring force being applied will differ from what is assumed in the design.

The present invention has been proposed in view of the problems of the prior art, and its object is to combine a pedestal and a pressure plate that can always hold a vertical surface with respect to the direction of the tensile member. The point is to provide an anchor head structure.

[0005]

In order to achieve the above-mentioned object, an anchor head structure according to the present invention is supported by a bearing portion arranged in contact with a natural ground and has a convex curved surface portion. The pedestal having the above-mentioned shape and the base end portion of the tensile member which is inserted into the drilled hole in the ground and whose tip is fixed in the drilled hole tightens the pedestal and slides along the convex curved surface. It is composed of a possible tightening member.

According to a second aspect of the present invention, a convex spherical pedestal supported by a bearing portion arranged in contact with the natural ground and a concave portion slidably fitted to the convex spherical portion of the pedestal are provided. A bearing plate having a curved surface portion and a tip end of the tension member inserted and fixed in the drilled hole of the natural ground are attached to the bearing portion and the pedestal of the tension member fixed therethrough, and the tip portion penetrating the bearing plate. It is composed of a tightening fitting that is tightened on the pressure plate.

According to a third aspect of the present invention, a columnar or cylindrical pedestal supported by a bearing portion arranged in contact with the ground, a holding metal fitting for holding the pedestal in the pressure receiving portion, and a shaving inside the ground A base end portion that is inserted into the hole portion and has a tip end portion that penetrates the columnar or cylindrical pedestal in the tensile member that is fixed in the drilled portion
It is composed of a tightening metal fitting that is tightened to the cylindrical pedestal.

According to the invention of claim 4, the holding metal fitting for holding the pedestal on the pressure receiving portion is formed of a wedge.

[0009]

Since the present invention is constructed as described above,
In the case where the pedestal surface does not hold a surface perpendicular to the pulling direction of the tensile member due to the direction error of the hole for inserting the tensile member in the ground and the finishing accuracy of the anchor head fixing surface, When the tension member is tightened and fixed to the pedestal and the bearing portion, the tightening member slides along the convex curved surface portion of the pedestal, so that the tension member is drilled in the direction in which the tension member is inserted. It can be tightened by fixing it to the pedestal and bearing so that it matches.

According to the invention of claim 2, when the tension member is tightened and fixed to the pedestal and the bearing portion, the concave curved surface portion of the bearing plate slides along the convex curved surface portion of the pedestal. As a result, the tension member can be fixed to the pedestal and the bearing portion so as to be tensioned so as to coincide with the drilling direction in which the tension member is inserted. According to the invention of claim 3, when the tension member is tightened and fixed to the pedestal, the holding member slides along the curved surface of the cylindrical pedestal supported by the bearing portion, so that the tension member is fixed. The tension member can be fixed to the pedestal and the bearing portion so that the tension member can be tensioned so as to coincide with the hole drilling direction.

According to a fourth aspect of the present invention, the columnar or cylindrical pedestal is held in the pressure receiving portion by using a holding metal member formed of a wedge, thereby simplifying the structure.
The workability is improved.

[0012]

The present invention will be described below with reference to the illustrated embodiments. 1 to 8 show a first embodiment of the present invention, in which 1 is a pedestal, which is formed in a convex spherical shape and is provided with a rectangular opening 1a so that the inside thereof can sufficiently withstand an anchoring force. The steel plates 1b are reinforced by combining them vertically and horizontally. (Refer to FIG. 5 to FIG. 6) 2 is a bearing plate, which is provided with a concave curved surface 2a slidably fitted to the convex spherical surface portion of the pedestal 1, and
A circular opening 2b is provided. (Refer to FIG. 7 and FIG. 8) Next, an anchor construction method including the anchor head structure will be described.

H-section steel S₁Scraped inside the natural ground G
A hole H is provided (see FIG. 1 (A)), and a tensile member is provided in the hole H.
3 is inserted (see Fig. 1 (b)), and the tip of the drilled hole H is fixed.
Inject the grout material into the hole,
After fixing the end portion, the base end portion of the tensile member 3 is fixed to the H-shaped steel.
S₁The opening 1a of the pedestal 1 installed in the
(Refer to (C)) Further, the above-mentioned pulling is performed in the opening 2b of the bearing plate 2.
The tension material 3 is penetrated, and perpendicular to the direction of the tension material 3.
The convex spherical surface of the pedestal 1 so as to occupy a position to keep it
Slide along the concave curved surface 2a (see FIG. 1D)
Pulls inserted through the openings 1a, 2b of the pedestal 1 and the bearing plate 2
The tension member 3 is tightened and fixed by the tightening fitting 4 (Fig. 1).
(See (e)) In the embodiment shown in FIG. 2, the Yamadome structure is
Concrete wall S₂The embodiment shown in FIG.
Independent pressure receiving of steel plate or concrete plate
Department S ₃Is configured.

9 to 14 show another embodiment of the present invention. In FIG. 9, 11 is a tension support plate for tensioning and fixing a tension member, which is arranged in contact with the natural ground G. The pedestal 12 is held at a predetermined position via a holding metal fitting 13 formed of a wedge or the like, and a tightening metal fitting 14 for a tension member described later is installed. In addition, in FIG. 9, the ground G
Although an example in which the holding pressure support plate 11 and the pedestal 12 are directly installed on the surface is shown, the pressure support plate 11 and the pedestal 12 differ depending on the structure of the earth pressure support of the mountain retaining structure as shown in FIG. 10 (a) is on the concrete wall surface, and FIG.
(B) shows a case where the structure is installed in a mountain retaining structure made of H-shaped steel S.

FIG. 11 shows a bearing plate, and FIG.
(D) is a square, (b) (e) is a circular steel main plate provided with an opening 11a for inserting a tensile member, and (c) (f) is a bearing plate 11 mainly made of concrete or reinforced concrete.
The periphery of the opening 11a is reinforced with a steel plate 11b.
FIG. 12 shows a pedestal, and FIGS. 12 (a) and 12 (e) are composed of a columnar body having a circular opening 12a through which the tensile member 15 penetrates, and FIGS. 12A is provided with a circular opening 12a through which
(G) is composed of a semi-cylindrical body having a circular opening 12a through which the tensile member 15 is penetrated. The pedestal shown in 12 (d) and (d) is a cylinder with an open circular cross section through which the tensile member 15 is penetrated. A constructed pedestal is shown.

FIG. 13 shows a holding metal 13 for holding the pedestal 12 at a predetermined position of the pressure bearing plate 11. The bottom surface 13a contacting the pressure bearing plate 11 is a flat surface, and the surface 13b contacting the pedestal 12 is an inclined surface or a pedestal. It is formed into a curved surface that matches the surface. FIG. 14 shows a step of an anchoring method using the anchor head structure of the present invention, in which a hole H for inserting a tensile material is excavated from the surface in a natural ground G generated by cutting soil or the like (FIG.
(See (a)) The tensile member 15 is inserted into the same drilled hole H, and after grout is injected into the drilled hole H (see FIG. 14B), the pressure bearing plate 11 is pulled into the opening 11a. 15 is penetrated and it is installed in the natural ground G. (See FIG. 14D) Further, the pedestal 12 is penetrated through the tension member 15 through the opening 12a, and the direction of the opening 12a of the pedestal 12 is the same direction as the direction of the tension member 15. It is installed on the pressure support plate 11 and is temporarily tightened through the tightening metal fitting 14. (Fig. 14
(See (d)) Next, a suitable number of holding metal pieces 13 are wedged between the pedestal 12 and the bearing plate 11 so that the pedestal 12 holds a predetermined position (see FIG. 14 (e)). The tension member 15 is tensioned and fixed by the tightening member 14.

[0017]

As described above, the anchor head structure according to the present invention has a pedestal having a convex curved surface portion supported by a bearing portion arranged in contact with the natural ground, and a convex shape of the pedestal. Since it is composed of a tightening member that is slidably arranged on the curved surface and tightens the base end of the tension material whose tip is fixed to the drilled hole in the natural ground, It can be fixed with a pedestal so that it matches the direction of the drilled holes. Therefore, when the tension member is tensioned and fixed to the pedestal, the force applied by the anchor head portion and the anchor force actually acting on the fixing portion can be matched.

Further, even if the angle between the surface of the mountain retaining structure and the direction of the tension member is not constant, the tension can always be applied in the direction of the tension member. Further, if the bearing portion and the pedestal are made of steel, various sizes can be easily obtained according to the purpose and at a relatively low cost. According to a second aspect of the present invention, the concave curved surface portion of the pressure bearing plate is slidably fitted to the convex spherical portion of the pedestal supported by the pressure bearing portion, and the tip of the tensile member is fixed to the drilled portion. By tightening the support part, the pedestal, and the tip penetrating part of the bearing plate to the bearing plate, the tension applied to the pedestal by tension makes it possible to apply the force applied by the anchor head and actually act on the anchoring part with a simple structure. Anchor forces can be matched.

According to the third aspect of the present invention, the columnar or cylindrical pedestal supported by the bearing portion arranged in contact with the natural ground is held by the pressure receiving portion via the holding metal, and By tightening the base end portion that penetrates the cylinder or the cylindrical pedestal to the cylindrical pedestal through the fastening metal fitting, the force applied by the anchor head and the anchor force actually acting on the fixing portion are matched. You can

According to a fourth aspect of the present invention, since the holding metal fitting for holding the pedestal in the third aspect of the invention is formed of a wedge, the structure can be simplified and the workability can be improved.

[Brief description of drawings]

1 (a), (b), (c), (d), and (e) are vertical cross-sectional views showing the steps of an embodiment of an anchor construction method including an anchor head structure according to the present invention.

FIG. 2 is a vertical cross-sectional view showing a state of implementation of another embodiment of the anchor construction method.

FIG. 3 is a vertical cross-sectional view showing an implementation state of another embodiment of the anchor construction method.

FIG. 4 is a side view of a pedestal.

5 is a view taken along the line EE in FIG.

6 is a perspective view taken along the arrow in FIG.

FIG. 7 is a side view of a bearing plate.

FIG. 8 is a view from the arrow of FIG.

9 (a) and 9 (b) are a plan view and a vertical sectional view showing another embodiment of the anchor head structure according to the present invention.

10 (a) and 10 (b) are vertical sectional views showing other embodiments of the anchor head structure according to the present invention.

11 (a), (b), and (c) are plan views showing respective examples of pressure bearing plates, and (d), (e), and (f) are respectively (a).
It is a side view of (b) and (c).

12 (a), (b), (c), and (d) are plan views showing respective examples of the pedestal, and (e), (f), (t), and (h) are (a), (b), and (b), respectively. (C) It is a vertical side view of (d).

13 (a), (b), and (c) are a plan view, a front view, and a side view of a holding metal fitting, respectively.

14 (a), (b), (c), (d), and (e) are vertical cross-sectional views showing the steps of another embodiment of the anchor construction method having the anchor head structure according to the present invention.

[Explanation of symbols]

C Concrete wall surface G Ground rock H Drilled hole S ₁ H-shaped steel S ₂ Independent structure pressure receiving part 1 Pedestal 1a Opening 1b Steel plate 2 Bearing plate 2a Concave curved surface 2b Opening 3 Tension material 4 Tightening fitting 11 Bearing plate 11a Opening Part 11b Steel plate 12 Pedestal 12a Opening 13 Holding fitting 14 Tightening fitting 15 Tension material

Claims (4)

[Claims] 1. A pedestal supported by a bearing portion arranged in contact with the natural ground and having a convex curved surface portion, and a tip end inserted into the drilled hole portion in the natural rock, and the tip end is fixed in the drilled hole portion. An anchor head structure, comprising a tightening member that tightens a base end portion of the tension member that penetrates the pedestal and is slidable along the convex curved surface portion. 2. A convex spherical surface pedestal supported by a bearing portion arranged in contact with the natural ground, and a concave curved surface portion slidably fitted to the convex spherical surface portion of the pedestal. The bearing plate and the tip of the tension member inserted and fixed in the drilled hole of the ground are attached to the bearing portion and the pedestal of the tension member fixed therethrough, and the tip portion penetrating the bearing plate, and the tension member is tightened to the bearing plate. The anchor head structure according to claim 1, wherein the anchor head structure comprises a tightening member. 3. A columnar or cylindrical pedestal supported by a bearing portion arranged in contact with the natural ground, a holding metal fitting for holding the pedestal at the pressure receiving portion, and a hole to be drilled in the natural ground. The anchor according to claim 1, further comprising a tightening fitting for tightening a base end portion of the tensile member having a tip portion fixed in the drilled hole portion, the base end portion penetrating the columnar or cylindrical pedestal to the cylindrical pedestal. Head structure. 4. The anchor head structure according to claim 3, wherein the holding metal fitting for holding the pedestal on the pressure receiving portion is constituted by a wedge.