JP3608829B2 - Anchor device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an anchor device used for securing a cable end portion of a small-scale suspension bridge and for safety equipment such as a rockfall / avalanche prevention weir and a debris flow / driftwood prevention weir.
[0002]
[Prior art]
According to the Guidelines for Small Suspension Bridges of the Japan Road Association, the scope of application is determined as follows.
(I) It is a bridge of 200m or less between branches on the municipal road.
(B) It is mainly a bridge for pedestrians and bicycles;
(C) Being a new bridge
In this way, regulations for small suspension bridges are relaxed compared to large structures such as long and large bridges, but suspension bridges originally have a high safety factor, so there are not a few unreasonable points in construction. Yes.
[0003]
In the construction of conventional anchors for small-scale suspension bridges, concrete foundation work has been carried out for both main ropes and wind-resistant cables even if the ground is solid. For example, as shown in FIG. 8, strong portions of the grounds 2 and 3 are excavated with a power shovel or the like, the excavation space is surrounded by a formwork, and concrete is placed on this to form concrete anchor blocks 7 and 18. The large anchor block 7 for the main rope 6 has a base portion of the anchor frame 8 embedded therein, and an adjustment rod 42 for adjusting the tension and the length of the main rope 6 is provided at a tip portion where the anchor frame 8 is not embedded. Yes. The adjusting rod 42 is screwed to the socket 10 to which the terminal portion of the main rope 6 is fixed.
Further, an adjustment rod or the like is embedded in the small anchor block 18 for the wind resistant cable 16, and a small socket 19 is screwed and connected thereto.
[0004]
[Problems to be solved by the invention]
However, there are many narrow terrain where heavy machinery such as power shovels cannot be carried in the planned construction site of small suspension bridges, and inefficient, dangerous and difficult work such as relying on manual work using lightweight and small tools is strong. It was done.
[0005]
In addition, the actual design and construction of a small suspension bridge is often subject to various restrictions. For example, if there is a road on the side of the bridge, there may be cases where the location for installing the large anchor block 7 for the main rope cannot be secured, or even if the location can be secured, It is uneconomical that the height of the column 5 needs to be further increased. If the bridge is located adjacent to the land (private land), it is uneconomical because a large amount of budget is required for the land acquisition, and there are cases where the land cannot be acquired.
[0006]
The present invention has been made in view of the above circumstances, and can be easily constructed even if the planned construction site is terrain where heavy machinery cannot be brought in, and the rope terminal portion of the small-scale suspension bridge excellent in safety can be constructed. An object of the present invention is to provide an anchor device used for fixing and safety equipment such as a rockfall / avalanche prevention weir and a debris flow / driftwood prevention weir.
[0007]
[Means for Solving the Problems]
The inventor has made intensive research efforts on rational design and construction methods for small suspension bridges, and as a result of intensively carrying out various studies, as a substitute for concrete blocks when the planned construction site is a solid rock mass We have found that the anchor bolts provide the necessary and sufficient support strength. As a result of further investigation, an earth anchor type PC steel bar or PC twisted wire may be considered, but the boring machine that is dissipated to drill into the rock is a heavy machine and cannot be put on site. Obtained knowledge. Therefore, the inventor considered drilling a rock mass with a manual rock drill and inserting and embedding a special anchor bolt therein, and came up with an upper structure of the special anchor bolt.
[0008]
An anchor device according to the present invention is provided with an anchor bolt filled with a hardening agent in a hole drilled in the ground, and fixed by being driven into the hole, and fastened to the end of the anchor bolt on the ground. A substrate, at least one pair of side plates supported by the substrate, pins provided between the pair of side plates, a cylindrical socket in which the end portion of the rope is embedded and fixed in the center, and the pins And a pair of adjusting rods that are swingably supported and fastened to the cylindrical socket on both sides of the cable end portion .
[0009]
It is desirable to use a special cement filled in a capsule or tube as a fixing agent. A special cement that is hydrated and hardened and has a desired strength is used. A fast-curing material or a slow-curing material can be used. Moreover, you may use the special resin chemical | medical agent which hardens | cures when two liquids are mixed as a fixing agent.
[0010]
[Action]
The anchor device according to the present invention selects a strong ground such as rock, for example, is drilled with a manual rock drill, then hydrated into a special cement capsule, etc., is filled in the hole of the rock, and anchor bolts are further installed. When inserted, the cement or the like solidifies, and then the superstructure is installed. When installing the superstructure, an anchor hardware including a pin and a pair of adjustment rods , a spacing tube, and a cap is provided on at least one side of both banks. A cylindrical socket in which the cable end portion is embedded and fixed is attached to a pair of adjustment rods of such an anchor hardware, and the tension applied to the rope is adjusted using a double nut attached to the tip of the adjustment rod .
[0011]
【Example】
Hereinafter, an embodiment in which the anchor device of the present invention is used for a small-scale suspension bridge will be described with reference to the accompanying drawings.
As shown in FIG. 1, the right bank side of the small-scale suspension bridge faces a gentle slope 2 and a steep slope 3 with a small area, and is a landform where heavy machinery cannot be brought in. An anchor device 40 for main ropes is installed on the gentle slope 2, and an anchor device 20 for windproof cables is installed on the steep slope 3. The terminal portion of the main rope 6 is firmly fixed in the metal cylindrical socket 10 by casting. The socket 10 is screwed to the adjustment rod 42 of the anchor device 40. The main rope 6 draws a gentle catenary line in the center of the suspension bridge via the top of the tower column 5. The main rope 6 is provided with suspension ropes 11 at substantially equal intervals, and a passage portion composed of a girder 13 and a balustrade 14 is suspended and supported. The base of the tower column 5 is embedded in the foundation block 4.
[0012]
The vertical girder, floor board, and handrail 14 of the passage portion are provided on the horizontal girder 13 and the horizontal frame, respectively, and are supported by a number of suspension ropes 11. The main rope 6 and the suspension rope 11 are fastened by a suspension fitting 12. In addition, the suspension rope 11 is connected to the vicinity of both ends of the cross beam 13 via a turn buckle, and supports the passage portion together with the cross beam 13. The balustrade 14 is a combination of struts, cross members and balustrade. The horizontal frame is provided in order to prevent deformation such as twisting and bending of the passage part in consideration of wind load and the like, and also has a role of connecting and reinforcing the horizontal beams 13 to each other.
[0013]
As shown in FIG. 2, a windproof cable 16 is provided obliquely below the cross beam 13. The windproof cable 16 is supported by the support cable 15 through the fastener 17 at substantially equal intervals. Note that the support 15 is fastened to the cross beam 13 of the passage part via a turnbuckle.
[0014]
Both ends of the windproof cable 16 are firmly fixed in a metal cylindrical socket 19 by casting. The socket 19 is screwed into the adjustment rod 22 of the anchor device 20. The anchor device 20 is fixed by four anchor bolts 24. Each anchor bolt 24 is driven deeply into the rock, and is firmly fixed to the rock with a special cement or a chemical.
[0015]
As shown in FIGS. 3 to 5, the substrate 21 of the windproof anchor device 20 is installed on the rock, and the upper ends of the anchor bolts 24 are fastened to the substrate 21 by nuts 29. A pair of side plates 27 facing each other are welded and fixed to the upper surface of the substrate 21. Each side plate 27 has a hole, and a pin 26 is inserted through the hole. Both ends of the pin 26 are fastened to the side plate 27 by nuts 29. Caps 30 are respectively placed so as to cover a slight gap between the pin 26 and the hole of the side plate 27.
[0016]
Insertion holes are formed in the connecting portions 23 of the pair of adjustment rods 22, and pins 26 are passed through the respective insertion holes. As a result, the adjustment rod 22 can swing up and down. On the other hand, a cylindrical socket 19 is provided at the tip of the adjustment rod 22. A distal end portion 16 a of the windproof cable 16 is embedded in the center portion of the cylindrical socket 19. The cylindrical socket 19 is made of, for example, a zinc-based cast alloy. A double nut 29 is provided at the tip of the adjustment rod 22.
[0017]
As shown in FIGS. 6 and 7, the main rope anchor device 40 includes eight anchor bolts 44. These anchor bolts 44 are thicker and longer than the windproof anchor bolts 24. The adjustment rod 42 and the pin 46 are also larger in diameter than those for windproof cables. Further, the substrate 41, the side plate 47, and the reinforcing plate 48 are also thicker and larger than those for windproof cables.
[0018]
Next, the case where the anchor device is installed will be described.
Select a solid ground such as bedrock and cut the rock surface flat. Drilled to a depth of about 1 to 2 m with a manual rock drill and inserted and filled with special cement capsules containing water in each hole. After filling the capsule, an anchor bolt is inserted, and when this solidifies after a predetermined time has elapsed, the superstructure is installed. In installing the superstructure, the anchor devices 20 and 40 of the present embodiment are installed on at least one side of both banks. The tubular sockets 10 and 19 of the cable end portion are attached to the anchor devices 20 and 40, and the tension acting on the cables 6 and 16 is adjusted. This kind of construction can be done by only a handful of workers bringing in a manual rock drill and a light and compact compressor.
[0019]
In the above embodiment, the case where the cable terminal portion of the small suspension bridge is fixed has been described. It can also be used for safety equipment.
[0020]
Moreover, although the said Example demonstrated the case where it installs on a bedrock, the anchor apparatus which concerns on this invention can be installed also on the existing concrete part, without being restricted only to this.
[0021]
【The invention's effect】
According to the present invention, since only a few operators can carry out construction simply by bringing in a manual rock drill and a light and small compressor, it is possible to carry out construction easily even on terrain where heavy machinery cannot be brought in or difficult to bring in. it can. For this reason, construction management becomes comparatively easy, and cost can be reduced significantly.
[0022]
In addition, according to the present invention, excavation work and concrete placing work are not required, and construction can be performed without causing a large-scale environmental destruction, which can greatly contribute to the preservation of the global environment.
[Brief description of the drawings]
FIG. 1 is a schematic view showing a small-scale suspension bridge provided with an anchor device according to an embodiment of the present invention.
FIG. 2 is a perspective view showing an anchor device as a windproof anchor.
FIG. 3 is an enlarged perspective view showing an anchor device as a windproof anchor.
FIG. 4 is a plan view showing an anchor device as a windproof anchor.
FIG. 5 is a side view showing an anchor device as a windproof anchor.
FIG. 6 is a perspective view showing an anchor device as a main rope anchor.
FIG. 7 is an enlarged perspective view showing an anchor device as a main rope anchor.
FIG. 8 is a schematic view showing a conventional anchor device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10, 19 ... Socket 20, 40 ... Anchor apparatus 21 ... Board | substrate 22 ... Adjustment rod 24, 44 ... Anchor bolt 26 ... Pin 27 ... Side plate 28 ... Reinforcement plate 29 ... Bolt 30 ... Cap

Claims (1)

An anchor bolt filled with a fixing agent having curability in a hole drilled in the ground, and fixed by being driven into the hole,
A substrate fastened on the ground to the end of this anchor bolt;
At least one pair of side plates supported by the substrate;
A pin provided between the pair of side plates;
A cylindrical socket in which the end of the cable is embedded and fixed in the center;
A pair of adjustment rods supported by the pins so as to be swingable and fastened to the cylindrical sockets on both sides of the cable end ;
An anchor device comprising:

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