KR20090020770A

KR20090020770A - Permanent type anchor having fixing steel pipes with different length according to the weight

Info

Publication number: KR20090020770A
Application number: KR1020070085339A
Authority: KR
Inventors: 김승관
Original assignee: 김승관
Priority date: 2007-08-24
Filing date: 2007-08-24
Publication date: 2009-02-27

Abstract

The present invention relates to a permanent anchor 100 having a fixture steel pipe different in length depending on the load, the PC strand 150 is inserted into the ground hole 20 via the grout (30) Permanent anchor 100 is fixed to the structure of the ground surface by using the pressure plate 112, the upper fixing head 110, the upper fastening member 113, the lower fixing head 122 and the lower fastening member 121, respectively. In the above, the PC strands 150 consisting of a plurality of strands are respectively wrapped by a pipe means is fixed to the upper and lower fixing head, the PC strands between the upper portion of the PC strands 150 and the upper fixing head It includes a waterproof pipe 120 is installed while wrapping a portion of the upper portion, and the waterproof packing 119 for closing the lower portion of the waterproof pipe 120, the pipe means is the lower fixing head 122 Pinned to The single PC wraps around the lower part of the strand (150) having a hollow portion, the surface is a spiral steel pipe fixing member 114 in the hollow handle and irregularities; A polyethylene (PE) pipe 115 extending directly above the hollow helical fixture steel pipe 114 and surrounding the remaining length of the PC strand 150; It includes a heat shrink tube 118 connecting the spiral fixture steel pipe 114 and polyethylene (PE) pipe 115, the heat shrink tube 118 is a circular band form the spiral fixture steel pipe ( 114 and the polyethylene pipe 115 are overlapped with each other in the overlapped state by applying heat to shrink and join the helical fixture steel pipe 114 and the polyethylene pipe 115 at the overlapped portions, respectively, thereby connecting both pipes to each other. The hollow spiral fixture steel pipe 114 is characterized by consisting of a plurality of spiral fixture steel pipes 114-1 and 114-2 of different lengths.

Description

Permanent Type Anchor Having Fixing Steel Pipes With Different Length According to the weight}

The present invention relates to a permanent anchor having a fixture steel pipe of different lengths depending on the load, and in particular, by using a hollow spiral fixture steel pipe to install a plurality of strands of PC strands, respectively, the weight and diameter of the anchor The present invention relates to a permanent anchor with fixture steel pipes of different lengths according to a new type of load which reduces the weight and simplifies the product.

Generally, permanent anchors are materials to be installed on both structures and ground. Permanent anchors made of multiple PC strands are fixed to both ends of the structure and the ground, giving prestressing forces (preloading and preloading) to the PC strands, resulting in excessive stress, deformation, and displacement that adversely affect the structure. This method is installed in the ground to stabilize the

Specifically, for example, when the permanent anchor is used to hit the retaining wall, such as the inclined surface of the building or road cut, according to the prior art (Korean Registered Utility Model No. 259095), the lower fixing part A permanent type made by installing the fixture reinforcement wire separately from the PC strand and installing several strands of unbonded strand wire in which the grease-coated PC strand is put in the polyethylene pipe. An anchor is disclosed.

However, the conventional permanent anchor as described above is a complex manufacturing process by installing several strands of unbonded stranded wire together in a large diameter polyethylene (PE) pipe at the same time and combined with a fixture reinforcement and a spiral reinforcement wire, the diameter of the anchor is large and heavy Weeping and construction had a difficult problem.

In addition, the existing anchor has a problem that makes the insertion of the permanent anchor difficult because the diameter of the anchor, the end of the fixing (or fixed) rebar is exposed, causing friction (locking) with the ground.

In addition, due to the direct contact between the end surface of the reinforcing bar and the surface of the hole (the hole for installing the anchor), a lot of soil is dropped around the hole, and is sandwiched between the permanent anchor and the hole, and the soil and grout (a mixture of cement and water) There is a problem in that structural instability is easily caused due to the degradation of the grout to reduce the quality of the grout and the adhesion of the grout.

In addition, since the anchor reinforcing bar is away from the load action point of the permanent anchor, the lower anchor tends to be eccentrically fixed, and thus, the action of the force is eccentrically generated, resulting in a crack in the grout and a decrease in strength.

In addition, there is a problem in that the diameter of the permanent anchor is increased to increase the drilling equipment, the drilling time, the increase in the amount of grout due to the need for a space to install the fixture reinforcement, when using the existing product in the same drilling diameter, Since the thickness of the grout is reduced, there is a problem that the adhesion force is reduced and the tensile force is unstable.

In addition, the above-mentioned conventional permanent anchor has a lot of accessory materials, such as helical fixture steel pipe, fixture reinforcement, slide polyethylene (PE) pipe, connecting ring (steel), and a large number of processing parts, thereby increasing the joint portion Due to the increase in the possibility of water inflow, the permanent anchor has a problem of increasing the possibility of corrosion of the deadly PC strands, which not only causes ground instability but also has a problem of soil pollution.

An object of the present invention has been proposed in order to improve the problems in the prior art as described above, in forming a lower fixing portion that serves to attach to the grout so as not to be pulled out of the ground, hollow hollow fixture steel pipe It is installed so that several strands of PC strands can be wrapped around each other, but the length of the plurality of fixture steel pipes is installed differently, thereby reducing the weight and diameter of the anchor and simplifying the product. In providing a permanent anchor.

Another object of the present invention is to provide a permanent anchor having a fixed steel pipe different in length depending on the load to install the waterproof pipe and the waterproof packing on the upper portion of the permanent anchor to prevent corrosion of the upper fastening member. In providing.

According to a preferred embodiment of the present invention for achieving the object as described above, the PC strand is inserted into the ground hole through the grout through the pressure plate, the upper fixing head, the upper fastening member, lower fixing head and lower In the permanent anchor fixed to the structure of the ground surface by using a fastening member, the PC strands consisting of a plurality of strands are each individually wrapped by pipe means to be fixed to the upper and lower fixing head, and the top and the top of the PC strands It includes a waterproof pipe installed to surround the upper portion of the PC strands between the upper fixing head, and a waterproof packing for closing the lower portion of the waterproof pipe, the pipe means is fixed to the lower fixing head It has a hollow portion surrounding the lower portion of the one PC strand, the surface is yaw Spiral steel pipe fixing member in the hollow handle and; A polyethylene (PE) pipe extending directly over the hollow spiral fixture steel pipe and surrounding the remaining strand of PC strand; It comprises a heat shrink tube for connecting the spiral fixture steel pipe and polyethylene (PE) pipe, the heat shrink tube by the heat in the overlapping state of the spiral fixture steel pipe and polyethylene pipe in the form of a circular band to shrink Each of the overlapped portions is sealed while being joined to the spiral fixture steel pipe and the polyethylene pipe, thereby connecting both pipes to each other. The hollow spiral fixture steel pipe has a plurality of spiral fixture steel pipes of different lengths. There is provided a permanent anchor having a fixture steel pipe of different lengths depending on the load.

Preferably, it characterized in that it further comprises a crack preventing grout reinforcing straps surrounding the plurality of hollow spiral fixture steel pipe.

According to the permanent anchor provided with a fixture steel pipe of different lengths according to the load according to the present invention as described above, in the construction of the lower fixing portion that serves to prevent the pull out from the ground by attaching to the grout, the hollow spiral fixing By installing the stiff pipes to surround the PC strands of several strands each, but by installing different lengths of the hollow spiral fixture steel pipe, it is possible to reduce the weight and diameter of the permanent anchor and simplify the product.

In addition, since the permanent anchor has a small diameter, the hollow spiral fixture steel pipe and the polyethylene pipe are connected in a straight line, and no additional fixture reinforcement is installed, there is no end face of the fixture reinforcement. The effect of smoothly inserting the anchors facilitates the construction of permanent anchors, as well as less soil falling from the contact surface of the anchors and less mixing of the soil and grout in the holes. There is an effect that can be increased, therefore, the strength of the grout is increased, there is an effect that the structural stability is enhanced, such as increased adhesion.

In addition, each of the PC strands is installed in the hollow spiral fixture steel pipe, so that the gap between the strands is securely maintained, and the grout is evenly wrapped around the hollow spiral fixture steel pipe so that the adhesive force is kept constant and the grout installation area is large. There is an effect of increasing the resistance and when the reinforcing strap is installed on the outer peripheral surface of the spiral fixture steel pipe has an effect of increasing the adhesion.

In addition, it is possible to shorten the drilling time, reduce the construction cost, and when using the permanent anchor according to the present invention at the same drilling diameter, because the thickness of the grout is relatively thick, the adhesive force is stronger and the tensile force is more stably maintained There is.

In addition, the installation of the waterproof pipe and waterproof packing has the effect of reducing the risk of corrosion and the possibility of soil contamination.

Hereinafter, a permanent anchor having a fixture steel pipe having a different length according to a load according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a side cross-sectional view of a ground showing a state in which a permanent anchor having a fixture steel pipe having a different length according to the load is mounted, and FIG. 2 is a fixture steel having a different length according to the load of FIG. 3 is an exploded perspective view of FIG. 2, FIG. 4 is a combined perspective view of FIG. 3, FIG. 5 is a sectional view taken along line II ′ of FIG. 2, and FIG. 4 is a perspective view of the combination of the crack preventing grout reinforcing strap is installed according to the invention.

1 to 6, the permanent anchor having a fixture steel pipe of different lengths according to the load according to the present invention, since the basic structure is similar to the permanent anchor of the prior art will be described with respect to other points do.

Permanent anchor 100 having a fixture steel pipe of different lengths according to the load according to the present invention is each PC (PC) strand wire 150 is fixed through the grout 30 in the ground hole (20) The pressure plate 112, the upper fixing head 110, the upper fastening member 113, the lower fixing head 122 and the lower fastening member 121 is fixed to the structure of the ground surface. In addition, the permanent anchor 100 is composed of a plurality of strands each of the PC strands 150 are individually wrapped by a pipe means is fixed to the upper and lower fixing head, the upper and the upper fixing of the PC strands 150 It includes a waterproof pipe 120 installed to cover the upper portion of the PC strands between the head and the waterproof packing 119 for closing the lower portion of the waterproof pipe 120, the pipe means is the upper A hollow spiral fixture steel pipe 114 having a hollow portion surrounding a lower portion of the one PC strand 150 fixed to the lower fixing head 122, the surface of which is uneven; A polyethylene (PE) pipe 115 extending directly above the hollow helical fixture steel pipe 114 and surrounding the remaining length of the PC strand 150; It includes a heat shrink tube 118 connecting the spiral fixture steel pipe 114 and polyethylene (PE) pipe 115, the heat shrink tube 118 is a circular band form the spiral fixture steel pipe ( 114 and the polyethylene pipe 115 are overlapped with each other in the overlapped state by applying heat to shrink and join the helical fixture steel pipe 114 and the polyethylene pipe 115 at the overlapped portions, respectively, thereby connecting both pipes to each other. The hollow spiral fixture steel pipe 114 is characterized by consisting of a plurality of spiral fixture steel pipes 114-1 and 114-2 of different lengths.

Reference numeral 123 denotes a crack preventing grout reinforcing strap surrounding the plurality of hollow helical fixture steel pipes 114.

Unexplained symbol G stands for ground and W stands for retaining wall.

In general, the assembly order of each component of the permanent anchor 100 is as follows. After cutting the PC strand 150 to an appropriate length, the hollow spiral fixture steel pipe 114, the lower fixing head 122, the lower fastening member, the surface of each cut PC strand 150, the concave and convex surface in turn (121) and the clamping member roll preventing plate 116 is inserted and fixed, respectively, and the anti-corrosion treatment by covering the lower corrosion prevention cap 117 containing the corrosion inhibitor.

In addition, the polyethylene (PE) pipes 115 are inserted to the length of the remaining total PC strands 150 just above the hollow spiral fixture steel pipes 114 fitted to the respective PC strands 150, and the connection portion thereof is a heat-shrink tube. (118). In addition, the pressure plate 112, the upper fixing head 110, the upper fastening member 113, the waterproof pipe 120 and the waterproof packing 119 in the upper surface of the structure is inserted into the PC strand (150) in turn and using a tensioning machine Fix it. In addition, the upper corrosion protection cap 111 is coated with a corrosion inhibitor to prevent the contents from corrosion.

Reference numeral 111a denotes grease (corrosion prevention) filled in the hollow helical fixture steel pipe 114 and grease (corrosion prevention) filled in the polyethylene pipe 115, respectively.

Reference numeral 111b indicates a cap fixing bolt for coupling the upper corrosion prevention cap 111 and the upper fixing head 110.

The construction sequence of the permanent anchor 100 having a fixture steel pipe different in length according to the load according to the present invention

First, drill a hole (diameter 10 cm ~ 16 cm) (20) in the ground using a drilling machine (not shown).

Second, the permanent anchor 100 assembled in the hole 20 is inserted starting from the lower part including the lower fixing head 122.

Third, grout (a mixture of cement and water) 30 is introduced into a hole 20 using a pump (not shown).

Fourth, the ground grout 30 is hardened so that the permanent anchor 100 and the ground are integrated.

Fifth, by using a tensioning machine (not shown) by pulling the PC strand 150 with a large force to give a prestress force (line load).

Sixth, the PC strand wire 150 is fixed to the structure by using the pressure plate 112, the upper fixing head 110, the upper fastening member 113, the waterproof pipe 120 and the waterproof packing 119.

The feature of the present invention is that the PC strands 150 are installed separately wrapped in a spiral fixture steel pipe 114 and polyethylene (PE) pipe 115, respectively. That is, the hollow spiral fixture steel pipe 114 and polyethylene (PE) pipe 115 is installed on the PC strands of several strands respectively, so that the PC strands are wrapped to reduce the weight and diameter of the anchor and simplify the product A permanent anchor is provided. However, in the present invention, the spiral fixture steel pipe 114 is divided into a long (114-1) and a short (114-2) by varying the length, the spiral fixture steel pipe (114-1) and ( 114-2) may optionally be used as needed. The reason for the different lengths, such as the spiral fixture steel pipes 114-1 and 114-2, is to secure more space for the grout 30 by reducing unnecessary materials, thereby achieving structural stability and light weight. It is to improve the workability. That is, when tension is applied on the surface of the permanent anchor 100 (when it is pulled tightly), only the required number of hollow helical fixture steel pipes 114-1 capable of resisting the tensile load are used, and the rest are very short lengths. It is a feature of the present invention to use only the hollow helical fixture steel pipe 114-2. In addition, the waterproof pipe 120 and the waterproof packing 119 is installed on the upper part to prevent corrosion of the upper fastening member.

At this time, the connecting portion of the spiral fixture steel pipe 114 and the polyethylene pipe 115 is connected by a heat shrink tube (118).

The heat shrink tube 118 is an intermediate connecting member for connecting the spiral fixture steel pipe 114 and the polyethylene pipe 115, which are different materials, to each other. By applying heat to the fixture steel pipe 114 and the polyethylene pipe 115 in an overlapping state, they are contracted while being joined to the spiral fixture steel pipe 114 and the polyethylene pipe 115 at the overlapped portions, respectively, and eventually It connects pipes together and prevents corrosion of PC strands.

In the present invention, the hollow helical fixture steel pipes 114-1 and 114-2 coupled by the lower fastening member 121 and the lower fixing head 122 exert a compressive force on the grout 30 when a tensile load is applied from the top. To prevent cracks in the grout 30.

1 is a side cross-sectional view of a ground showing a state in which a permanent anchor with a fixture steel pipe having a different length according to a load according to the present invention is mounted.

2 is a side cross-sectional view of a permanent anchor with fixture steel pipes of different lengths depending on the load of FIG.

3 is an exploded perspective view of FIG. 2.

4 is a perspective view of the combination of FIG.

5 is a cross-sectional view taken along line II ′ of FIG. 2.

Figure 6 is a perspective view of the combination of Figure 4 is installed crack preventing grout reinforcing strap according to the present invention.

Explanation of symbols on the main parts of the drawings

100: permanent anchor 114, 114-1, 114-2: hollow spiral fixture steel pipe

115: polyethylene (PE) pipe 118: heat shrink tube

119: waterproof packing 150: PC strand 120: waterproof pipe

123: crack preventing grout reinforcing string 150: PC strand

Claims

PC strand (150) inserted into the ground hole (20) through the grout 30 fixed to the pressure plate 112, the upper fixing head 110, the upper fastening member 113, the lower fixing head 122 In the permanent anchor 100 having a fixture steel pipe different in length depending on the load fixed to the structure of the ground surface by using the lower fastening member 121),

Each of the PC strands 150 formed of several strands is individually wrapped by pipe means and fixed to the upper and lower fixing heads, and the upper portions of the PC strands between the upper portions of the PC strands 150 and the upper fixing heads. It comprises a waterproof pipe 120 and a waterproof packing 119 for closing the lower portion of the waterproof pipe 120 is installed while wrapping a portion,

The pipe means

A hollow spiral fixture steel pipe 114 having a hollow portion surrounding a lower portion of the one of the PC strands 150 fixed to the lower fixing head 122, the surface of which is uneven;

A polyethylene (PE) pipe 115 extending directly above the hollow helical fixture steel pipe 114 and surrounding the remaining length of the PC strand 150;

It comprises a heat shrink tube 118 connecting the spiral fixture steel pipe 114 and polyethylene (PE) pipe 115,

The heat-shrinkable tube 118 is formed in a circular strip shape by applying heat in the overlapping state of the spiral fixture steel pipe 114 and the polyethylene pipe 115 so that the spiral fixture steel pipes 114 are respectively overlapped. And is sealed while being joined with the polyethylene pipe 115 is characterized in that eventually connecting both pipes,

The hollow helical fixture steel pipe 114 is composed of a plurality of helical fixture steel pipes 114-1 and 114-2 having different lengths, and having a fixture steel pipe different in length according to the load. Permanent anchor (100).

[4] The apparatus of claim 1, further comprising a crack preventing grout reinforcing strap 123 surrounding the plurality of hollow spiral fixture steel pipes 114. One permanent anchor (100).