KR20090022880A

KR20090022880A - Construction method of byoyance protection anchor

Info

Publication number: KR20090022880A
Application number: KR1020070088551A
Authority: KR
Inventors: 이기환; 배민혁
Original assignee: 쌍용건설 주식회사
Priority date: 2007-08-31
Filing date: 2007-08-31
Publication date: 2009-03-04

Abstract

A method of constructing a buoyancy prevention anchor for installing a structural anchor in a ground including a rock layer and a soft ground layer positioned on the rock layer includes: forming a concrete layer on the soft ground layer; Drilling a through hole penetrating the concrete layer and the soft ground layer and a receiving groove accommodating one end of the anchor in the rock layer; Installing the anchor in the through hole and the receiving groove so that the anchor is exposed from the upper portion of the concrete layer; Injecting grout material into the through hole and the receiving groove; A first pressure plate, which is anchored from the concrete layer and is supported by the concrete layer, a second pressure plate which is spaced apart from the first pressure plate, and which the anchor penetrates, and is disposed between the first pressure plate and the second pressure plate, the first pressure plate and the first pressure plate. 2 installing a spacer in the concrete layer, the spacer having a sleeve for maintaining a spacing between the acupressure plates; Tensioning the anchor to secure the anchor to the spacer; Embedding the anchor exposed outside the concrete layer, and forming the foundation of the structure. This can shorten the construction period and improve the quality of the foundation.

Description

Construction method of buoyancy prevention anchor {CONSTRUCTION METHOD OF BYOYANCE PROTECTION ANCHOR}

The present invention relates to a method of constructing a buoyancy preventing anchor which is installed to prevent the rise of the hydraulic pressure of the structure, more specifically, the construction of the foundation of the structure after the tension of the installed anchor to shorten the construction period and It relates to a construction method of the buoyancy prevention anchor to improve the quality.

When the building structure is stretched on the soft ground, the axial force subsided by its own weight and the buoyancy force to be flowed by the groundwater are applied to the structure. So we install anchor piles in the structure.

Conventional construction of anchor piles cast concrete on the soft ground, through the concrete and the soft ground to perforate to a solid rock layer. Then, after the anchor is inserted into the perforated hole, cement is injected into the perforated hole so that the anchor and the rock layer are joined. The anchor exposed outside the perforated hole is then wrapped in a sleeve to form the foundation of the building. At this time, the upper portion of the anchor exposed out of the sleeve to form the foundation portion to be able to tension the anchor after the concrete forming the foundation is hardened. After the foundation is firm, the anchor is tensioned, and the construction period is long because the part of the foundation which is left to tension the anchor is finished after tensioning of the anchor. In addition, since the foundation is not formed at one time, the strength of the connecting portion of the foundation formed first and the foundation formed later may be lowered.

The present invention is to solve the above problems, an object of the present invention is to provide a method of constructing a buoyancy preventing anchor that can shorten the construction period.

Another object of the present invention is to provide a method of constructing a buoyancy preventing anchor which can improve the quality by forming the base at a time.

According to a preferred embodiment of the present invention for achieving the above object of the present invention, the construction method of the buoyancy prevention anchor for installing a structure anchor on the ground comprising a rock layer and a soft ground layer located above the rock layer, soft ground Forming a concrete layer over the layer; Drilling a through hole penetrating the concrete layer and the soft ground layer and a receiving groove accommodating one end of the anchor in the rock layer; Installing the anchor in the through hole and the receiving groove so that the anchor is exposed from the upper portion of the concrete layer; Injecting grout material into the through hole and the receiving groove; A first pressure plate, which is anchored from the concrete layer and is supported by the concrete layer, a second pressure plate which is spaced apart from the first pressure plate, and which the anchor penetrates, and is disposed between the first pressure plate and the second pressure plate, the first pressure plate and the first pressure plate. Installing a spacer in the concrete layer, the spacer having a sleeve for maintaining a spacing between the two pressure plates; Tensioning the anchor to secure the anchor to the spacer; Embedding the anchor exposed outside the concrete layer, and forming the foundation of the structure.

The anchor includes a male screw part and a nut screwed with the male screw part and supported by the second pressure plate in an area exposed to the upper concrete layer, and the anchor may be tensioned and relaxed by screwing the male screw part and the nut.

It is preferable to further include a cap for sealing a portion protruding above the second pressure plate.

The construction method of the buoyancy preventing anchor of the present invention can be constructed immediately after the tension of the anchor, and can shorten the construction period because the foundation can be formed at once.

In addition, since the foundation of the building is completed in one construction, the quality of the foundation can be improved.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, but the present invention is not limited or limited by the embodiments.

1 is a cross-sectional view of the ground applying the construction method of the buoyancy preventing anchor according to an embodiment of the present invention, Figure 2 is a flow chart of the construction method of the buoyancy preventing anchor according to an embodiment of the present invention.

Hereinafter, referring to FIGS. 1 and 2, a method of constructing an anti-buoyancy anchor for installing a structural anchor 130 on a ground including a rock layer 10 and a soft ground layer 20 stacked on the rock layer 10. It will be described in detail.

Construction method of the buoyancy prevention anchor, the step of forming the concrete layer (110) (S110), the step of drilling the through hole 112 and the receiving groove 12 (S120), the through hole 112 through the anchor (130) And installing in the receiving groove 12 (S130), injecting the grout material 120 (S140), installing the spacer 140 (S150), tensioning the anchor 130, anchor 130 ) Is fixed to the spacer 140 (S160), and forming the base portion 30 (S170).

The anchor pile includes the anchor 130, the grout material 120 and the spacer 140, is installed to prevent the building structure to be stretched on the soft ground layer 20 to rise.

The ground includes a rock layer 10 and a soft ground layer 20, and the soft ground layer 20 is stacked on the hard rock layer 10. First, the concrete layer 110 is formed on the soft ground layer 20.

After the concrete layer 110 is formed, the through hole 112 penetrating the concrete layer 110 and the soft ground layer 20 and the one end 130a of the anchor 130 are accommodated in the rock layer 10. Perforate the receiving groove 12. In the drilling work for the installation of the anchor 130, the diameter of the through hole 112, the depth of the through hole 112, the cleanliness of the through hole 112 and the receiving groove 12 should be checked.

After drilling the through hole 112 and the receiving groove 12, the anchor 130 is inserted into the through hole 112 and the receiving groove 12. At this time, the other end 130b of the anchor 130 is exposed to the upper portion of the concrete layer 110.

After inserting the anchor 130 into the through hole 112 and the receiving groove 12, the grout material 120 is injected into the through hole 112 and the receiving groove 12. The anchor 130 is firmly fixed to the rock layer 10 by the grout material 120. As the grout material 120, it is preferable to use a waterproof material provided with cement as a main material. In general, general hydration cement is used for the cement which is the main material of the grout material 120. However, in order to avoid corrosion of the anchor 130, chlorine of more than 0.02% by weight, sulfur of more than 0.1% should not be contained.

After the grout material 120 is injected, the first pressure plate 141 supported by the concrete layer 110 through the anchor 130 exposed to the outside of the through hole 112 is placed on the concrete layer 110. Then, the sleeve 142 is maintained on the first pressure plate 141 to maintain the gap between the first pressure plate 141 and the second pressure plate 143, and the second pressure plate 143 through which the anchor 130 penetrates the sleeve ( The spacer 140 is installed on the top of the 142. In the present embodiment, the first pressure plate 141, the sleeve 142, and the second pressure plate 143 are provided separately, but may be formed integrally in some cases.

Then, the anchor 130 is tensioned to fix the anchor 130 to the second pressure plate 143. The reason for tensioning the anchor 130 in advance is to prevent the base portion 30 from flowing by buoyancy caused by groundwater. In general, the tensioning operation of the anchor 130 is carried out more than one week after the injection of the grout material 120, and in some cases it may be shortened by using a steel. At this time, the strength of the grout material should be checked and then tensioned.

In this embodiment, the male screw portion 131 is formed on the anchor 130 exposed to the concrete layer 110 to tension the anchor 130, and the male screw portion 131 is screwed onto the second pressure plate 143. And the nut 132 is supported on the second pressure plate 143 is located. The anchor 130 may be tensioned and relaxed by screwing the male screw portion 131 and the nut 132. After the anchor 130 is tensioned, the anchor 130 is fixed to the spacer 140 and specifically to the second pressure plate 143.

Then, the anchor 130 exposed to the outside of the concrete layer 110 is embedded, and forms the base portion 30 of the structure. In the construction of the conventional anchor pile, the anchor is stretched after curing the foundation, and a portion of the anchor must be exposed for tensioning, so that the foundation is formed by partially removing the portion for exposing the anchor. Thus, the construction period is lengthened because the anchor is waited until the foundation is solidified, and the foundation is completed by refinishing the part left empty for the exposure of the anchor. In addition, since the foundation is not constructed at one time, the strength of the connecting portion of the foundation formed first and the foundation formed later may be inferior.

However, the construction method of the buoyancy preventing anchor according to the present invention forms the foundation integrally in one construction, the construction period is shortened, the strength of the foundation is increased.

In addition, before embedding the anchor 130 exposed to the outside of the concrete layer 110 for future maintenance, to seal the protruding portion above the second pressure plate 143 to enable the tension control operation of the anchor 130. Install the cap 150 further.

As described above, although described with reference to the preferred embodiment of the present invention, those skilled in the art various modifications and variations of the present invention without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

1 is a cross-sectional view of the ground to which the construction method of the buoyancy preventing anchor according to an embodiment of the present invention is applied.

Figure 2 is a flow chart of the construction method of the buoyancy preventing anchor according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

10: rock formation 12: accommodation home

20: Soft ground layer 30: Foundation part

110: concrete floor 112: through hole

120: Grout material 130: Anchor

131: Male thread 132: Nut

140: Spacer 141: The first chiropractor

142: Sleeve 143: Second shiatsu plate

Claims

In the construction method of the buoyancy preventing anchor for installing a structural anchor in the ground comprising a rock layer and a soft ground layer located above the rock layer,

Forming a concrete layer on the soft ground layer;

Drilling a through hole penetrating through the concrete layer and the soft ground layer, and a receiving groove accommodating one end of the anchor in the rock layer;

Installing the anchor in the through hole and the receiving groove such that the anchor is exposed from an upper portion of the concrete layer;

Injecting grout material into the through hole and the receiving groove;

A first acupressure plate through which the anchor protruding from the concrete layer and supported by the concrete layer, a second acupressure plate spaced apart from the first acupressure plate, and through which the anchor penetrates, and disposed between the first acupressure plate and the second acupressure plate Installing spacers on the concrete layer, the spacer having a sleeve for maintaining a gap between the first pressure plate and the second pressure plate;

Tensioning the anchor to secure the anchor to the spacer;

Embedding the anchor exposed to the outside of the concrete layer, and forming a foundation of the structure;

Construction method of the buoyancy prevention anchor comprising a.

The method of claim 1,

The anchor includes a male screw portion in the area exposed to the upper concrete layer, a nut screwed with the male screw portion and supported by the second pressure plate,

The anchor is a buoyancy preventing anchor construction method characterized in that the tension and relaxation in the screwing of the male screw portion and the nut.

The method of claim 1,

Construction method of the buoyancy preventing anchor further comprises a cap for sealing a portion protruding to the upper portion of the second pressure plate.