KR940002458B1 - Working method of anchoring bolts and space block - Google Patents

Abstract

The spacer block is constructed of insulator material, such as motar, wood or plastic resin, in the shape of hexahedron, which is divided into two symmetrical halves, each having on its inner side a semi-circular section groove for placing a tube hose for filling cement grout and on its outer side a plurality of grooves of a semi-circular section for placing steel wires each covered with a protective insulation tube. For the construction of an anchor, an anchor prestructure is formed of a plurality of the spacer blocks assembled of half blocks each having steel wires and a grout hose in a length and is placed underground through a hole to pour cement grout through the hose and apply electric heat through the wires to the grout for faster curing to shorten the construction time. The wires are fastened to the reinforcing beams.

Description

Underground anchor construction method and spacer block used

1 is a schematic side cross-sectional view illustrating the construction method of the present invention.

2 is a plan view showing the configuration of an underground anchor according to the present invention.

Figure 3a is an exploded perspective view of the space block used in the present invention, (b) is a partial perspective view showing that the strand and the secondary hose is coupled to the spacer block of Figure 3a.

4 is an electrical connection diagram used in the construction method of the present invention.

5 is a partial perspective view illustrating a spacer block used in a conventional construction method, and a strand wire and an injection hose are coupled thereto.

* Explanation of symbols for main parts of the drawings

1: spacer block 2: upper block

3: lower block 4: strand

5 recessed part 6 protrusion part

7: injection hose 8: hole

9: wire 10: thermocouple

11: temperature display means 12: protection tube

13: binding wire 14: anchor structure

15: insertion hole 16: electric wire

17: power supply device 18: H-shaped beam

19: reinforcement beam 20: earth plate

The present invention relates to an underground anchor construction method, and more particularly, to an underground anchor construction method and a spacer block used to improve an air shortening and construction efficiency by shortening the curing time of the injected cement grout.

In general, in case of excavation of a predetermined width and depth by cutting the ground in construction or civil engineering work, the H-shaped beams are embedded in the ground at predetermined intervals so that the surrounding soil walls do not collapse, and then the earthen boards for earthen membranes between these H-shaped beams After lamination, through a pair of H-shaped beams (hereinafter referred to as reinforcement beams) installed across the H-shaped beams (hereinafter referred to as anchorage) and other areas (hereinafter referred to as self-melting) Constructed underground anchors are inclined to maintain the earth plate in a vertical position.

However, in the conventional underground anchor construction method, as shown in FIG. 5, a plurality of recesses 30 are formed in the disc-shaped fixing part of the underground anchor in the circumferential direction at predetermined intervals and have a through hole 31 at the center thereof. A plurality of strands 33 having a diameter of about 13 mm are respectively inserted into the recesses 30 by using the spacers 32 formed thereon, and a cement grout injection hose 34 is inserted into the through holes 31. After the fitting, these strands 33 are bonded at predetermined intervals in the longitudinal direction and inserted into holes having a diameter of about 100 mm perforated in the ground, and then cement cement grout having a water cement ratio of about 0.5 is injected through the injection hose 34. As the cement grout solidifies and cures, when the anchorage part of the underground anchor is formed, the strand is pulled to fix the wedge to the reinforcement beam.

However, the conventional construction method as described above takes about 5 ℃ 7 days to fully cure the cement grout that forms the anchorage site, the total construction days are long, and accordingly it is not possible to shorten the air, so human and There was a drawback that the construction efficiency could not be improved due to the increase of material cost.

Therefore, the present invention was invented to solve the above-mentioned shortcomings, and an object of the present invention is to provide an underground anchor construction method which can shorten the curing time of the injected cement grout to improve air shortening and construction efficiency. will be.

Another object of the present invention is to provide a spacer block for underground anchor construction, which is simple in installation and construction work.

The construction method of the present invention for achieving the above object, the step of binding the stranded wire and the injection hose to the spacer block divided into a predetermined shape to create an anchor structure, and inserting the anchor structure through the insertion hole drilled in the ground Comprising a step of heating the cement grout through the injection hose of the anchor structure, and pulling the stranded wire to settle on the earth plate, reducing the curing time of the cement grout to about 1/5 than the conventional method to shorten the air And construction efficiency can be improved.

In addition, the spacer block used in the construction method of the present invention is a split structure of the upper and lower symmetry, the concave portion is formed to fix the strands spaced apart on the upper and lower surfaces, the semi-circular hole portion for the injection hose mounting is formed in the center In addition, the stranded wires are connected to each other during construction to prevent the short-circuit phenomenon as well as a simple structure to improve the efficiency of construction work.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

First, the spacer block 1 used in the present invention will be described. As shown in FIG. 3, the upper and lower blocks 2 and 3 having a rectangular parallelepiped made of an insulating material such as morph tar, wood, or synthetic resin are shown. It is divided symmetrically, and on one side of these upper and lower blocks 2 and 3, a semicircular shape is provided so that a plurality of strands 4 having a diameter of about 13 mm can be spaced apart from each other (six in three in the present embodiment). The concave portion 5 is formed in parallel through the protrusions 6, and the injection grout 7 for injection of the cement grout is formed in the center of the other surface of the upper and lower blocks 2 and 3, that is, in contact with each other. It has a structure in which a semicircular hole portion 8 of a larger diameter is formed so that is mounted.

Next, when explaining the construction method of the present invention using the space block (1) as described above, the underground anchor consisting of a jeongchaejang (A) and other parts of the free field (B) is filled with cement grout to act as an anchor Fitting the stranded wire 4 and the injection hose 7 cut into predetermined lengths according to the construction length of the semicircular recess 5 and the hole 8 of the lower block 3 of the spacer block 1, respectively. Bar, the spacer block (1) used at this time is arranged in a plurality of intervals about 1m to support the entire length of the strand 4 and the injection hose (7) appropriately and then support the strand 4 and the injection hose ( The upper block 2 on the lower block 3 to which 7) is assembled is correspondingly coupled to each other.

Subsequently, a thermocouple 10 is installed through one of the strands 4 to reach the anchorage site, and the other end of the thermocouple 10 is connected to the temperature display means 11. After wrapping the protective tube 12 made of plastic on its outer periphery so that the groundwater or cement grout may be insulated from each other by the entire length of the portion corresponding to the free field, the stranded wire 4 ) And the spacer block 1 are bundled in two places with the bundled binding wire 13 to form the anchor structure 14 as shown in FIG.

Next, the anchor structure 14 manufactured as described above is inserted into the insertion hole 15 drilled in the ground, and the cement grout having a water cement ratio of about 0.5 is injected through the injection hose 7. The injection amount of is determined according to the construction conditions such as the material of the ground and the size of the excavation, but the amount that can completely fill the site of the anchorage.

Subsequently, the stranded line 14 protruding from one end of the anchor structure 14 constructed as described above, that is, the free field end is connected in series with the wire 16 as shown in FIG. 1) The three strands of strands (4) coupled to the three strands of strands (4) coupled to the lower block (3), respectively, and electrically connected with an electric wire, etc. to make two pieces, and then the adjacent anchor structure ( 14, respectively, connected in series, and connecting the power supply device 17 (in the present embodiment, AC welding) to the other end of these wires 16, the anchor structure 14 of the construction method of the present invention The construction of the bar is completed, in this way, along the circumference of the ground excavated in the reinforcement beam (19) consisting of a pair of H-shaped beams fixedly installed across the H-shaped beams 18 at predetermined intervals. The underground anchor structure 14 is constructed in sequence.

At this time, the underground anchor structure 14 of the present invention, as shown in FIG. 1, the lower the overall length of the underground anchor structure 14 at a predetermined rate as it goes down according to the depth of the excavated ground bar, which is pulled out into the ground Increasingly, each of the underground anchor structures 14 has a small load, so even if the length thereof is short, there is no problem, and there are effects such as material saving and simplicity of construction work.

Next, the operational effects of the present invention having the above configuration will be described.

When the switch (not shown) of the power supply 17 is turned on to apply current to two different strands 4 via the wires 16, the current flows along the ductility 4, which is a conductive material. In this case, the temperature is increased by the heat of resistance of the cement grout, that is, the joule heat, which is filled between two sets of strands 4 divided up and down. Will be promoted.

At this time, while measuring the temperature of the fixing portion detected by the thermocouple 10 through the temperature display means 11, the current is adjusted so that the temperature rise rate is 20 ° C / hr, and then the temperature display means 11 When the temperature indicated by the predetermined temperature reaches a predetermined temperature to control the current supplied through the power supply unit 17 to maintain a constant temperature of the cement grout being cured, that is, the cement grout is solidified to a predetermined strength During the time required to express (8-10 hours in the present embodiment) the temperature of the cement grout is kept constant, then the switch 9 is turned off and the cement grout is allowed to cool naturally.

Subsequently, when a predetermined time, that is, the time required for curing the cement grout, is hardened, when the stranded wire 4 protruding toward the free field is pulled and fastened to the reinforcement beam 19, the cement grout solidified on the anchorage side is ground. By acting as an anchor in the earth plate 20 and the H-shaped beam (18) to maintain the strength of the binding strength firmly.

As described above, according to the present invention, the underground anchor structure 14 can be easily manufactured using the spacer block 1 divided into upper and lower blocks 2 and 3, and the injected cement grout is used as a resistance heat. By heating and curing in a short time, the construction time can be greatly shortened, thereby shortening the air and reducing the human and material resources associated with it, thereby improving the construction efficiency.

Claims (9)

Binding a plurality of strands 4 and injection hoses 7 to a spacer block 1 divided into a predetermined shape to form an anchor structure 14, and inserting holes formed in the anchor structure 14 in the ground ( Inserting through 15), injecting cement grout through the injection hose 7 of the anchor structure 14, heating the cement grout in a resistance type generated by applying a current to the strand (4). And, Underground anchor construction method comprising the step of pulling the strand (4) to fix the earth plate (19). The method of claim 1, wherein the protective tube (12) of the refining material is wrapped around the free end of the strand (4) of the anchor structure (14). The thermocouple (10) is attached to one of the anchoring strands (4) of the anchor structure (14) via a conductor (9), and one end of the thermocouple (10) is connected to a temperature display means (1). 11) underground anchor construction method characterized in that to measure the temperature of the cement grout in connection with. The method according to claim 1, characterized in that the strands (4) of the adjacent underground anchor structures (14) are connected in series to a power supply (17) to apply a current. The underground anchor construction method according to claim 4, wherein the power supply device (17) is made of an AC welding ground. It consists of upper and lower blocks (2, 3) divided symmetrically up and down, a plurality of recesses (5) are formed on one side via the projection (6), a large diameter hole in the center of the other side A spacer block for underground anchor construction in which the section 8 is formed. 7. The spacer block for underground anchor construction according to claim 6, wherein the upper and lower blocks (2, 3) are assembled to form a tetrahedron. 7. The spacer block for underground anchor construction according to claim 6, wherein the upper and lower blocks (2, 3) are made of an insulating material. 8. The spacer block for underground anchor construction according to claim 7, wherein the insulating material is made of one of mortar, wood, or synthetic resin.