KR101793037B1 - Construction method of permanent wall with retaining wall combined PHC pile and steel pipe - Google Patents

Abstract

The present invention provides a method of constructing an earth retaining and permanent wall using a pre-stressed high-strength concrete (PHC) pile and a steel pile together such that a concrete placing works for stable performance when constructing a wall. According to a preferred embodiment of the present invention, the method of constructing the earth retaining and permanent wall using the PHC pile and the steel pile together comprises: (a) a step of repeatedly embedding at least two PHC piles and one steel pile into each perforated hole in a perforated arrangement direction after perforating the hole in the ground and cutting and arranging each head part of the piles; (b) a step of performing grouting with a waterproof material (18) to install the waterproof material on a retaining wall; (c) a step of placing front end connection materials, which are also used as a furring strip supporter having each furring strip installed in a corresponding position per predetermined height, and connecting a strut to a corresponding furring strip; (d) a step of constructing a bottom slab by placing concrete on a bottom surface of an excavated part to have a predetermined thickness; (e) a step of holding a flat tie holder by each of an upper and lower front end connection materials as a furring strip supporter to horizontally be installed to vertically be arranged; (f) a step of installing a mold for a wall; (g) a step of installing a wall; (h) a step of repeating steps (e), (f), and (g) sequentially in an upper direction to construct a permanent wall of an underground structure.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a permanent wall and a permanent wall using a PHC file and a steel pipe file,

The present invention relates to a method of constructing a wall of an underground structure, and more particularly, it relates to a method of constructing an economical permanent wall, The present invention relates to a method of constructing a retaining wall and a permanent wall by using a PHC file and a steel pipe file in combination so that concrete can be installed.

Generally, the earth retaining method is a method in which a thundering pile (H-shaped steel, rail steel) is inserted into the ground or inserted into a previously drilled hole, (CIP) method to construct drilled piles, and SCW method to form a wall after connection of Soil Cement pile before excavation.

On the other hand, when a permanent pipe wall is applied by applying a steel pipe used as a pile, economical efficiency is lowered. Therefore, as an alternative, you can think of mixing PHC files. PHC files have high end bearing capacity, but are difficult to penetrate into the ground from the opening of the perforation hole. In addition, there is a problem that it is not possible to support the wall formwork to be connected to the PHC file to form the wall of the underground structure. In addition, a means is required for placing a wristband in the PHC file.

Therefore, in case of constructing the earth retaining wall by using the steel pipe and the PHC file together, the self-sufficiency of the landfill and the ease of installation of the wall formwork should be considered.

As a background of the present invention, Korean Registered Patent Registration No. 10-1034398 has proposed a method of constructing an underground structure together with an underground sand retaining method. This is the first stage of building underground structures on the ground; A second step of excavating the lower part of the underground structure; A third step of supporting the underground structure on the excavation surface and installing a jack support to adjust the height of the underground structure; Lowering the underground structure with the jack support and placing it on the excavation surface; And repeating the steps 1 to 4 sequentially to lower the underground structure to a required position and then removing the jack support.

Therefore, it is possible to simplify the construction work of the basement and to reduce the construction cost due to the shortening of the construction period, and to use the underground structure as the earth retaining wall, This is unnecessary and has the effect of minimizing the displacement of the surrounding soil. However, this background technique can not construct a permanent wall that also acts as a retaining wall because the underground structure is constructed without the construction of the retaining wall.

Another background art of the present invention is proposed in Korean Patent Registration No. 10-1109520, 'Retaining construction method using steel pipe file'. This is a method of constructing an earth retaining structure on a site using a strut and a plate in an underground building construction, comprising: a first step of drilling a required depth using a casing hammering; A second step of accommodating a plurality of steel pipe files in the hammering drill; A third step of sealing the inside of the steel pipe with the filling material filled and attaching the support while performing excavation in the field; And a fourth step of installing a strut and a strand plate using the steel pipe file and a support, removing the strand and the strut after the underground construction is completed, and removing the steel pipe file with the filler left behind, The steel pipe file of the second stage is provided with a finishing plate welded to the lower end, and the filling of the third stage uses sand.

Therefore, the latter background technology has the effect of shortening the overall air volume while reducing the number of struts by increasing the support strength against earth pressure by using steel pipe file instead of H-file, There is a problem that the wall thickness of the underground structure must be made large.

Korean Patent Registration No. 10-1034398 Korean Patent Registration No. 10-1109520

The present invention relates to a PHC file capable of constructing an economical permanent wall, enhancing a composite force between a steel pipe file and a concrete wall, eliminating the need for a separate wale bracket, and enabling the concrete to be stably placed during wall construction And it is an object of the present invention to provide a method of constructing a retaining wall and a permanent wall by mixing steel pipe files.

According to a preferred embodiment of the present invention, (a) a perforation is made in the ground with a certain depth at a position where the retaining wall is to be formed, and then two or more PHC files and one steel pipe file are repeated in the perforation holes And cutting each of the tofu into pieces; (b) performing grouting from the back surface of the PHC file and the steel pipe file to the car body 18 from the back to the front to construct the carcass in the earth retaining wall; (c) Repeat step excavation downward from the front of the PHC file and steel pipe file until reaching the target depth of the trencher. While installing the tie-joint shear joint at regular intervals in the steel pipe file at each excavation step, Placing a wristband on a wristband joint-use shear connector provided at the corresponding position, and connecting the strut to the wristband; (d) placing a concrete slab on a bottom surface of the tearing machine to construct a bottom slab; (e) horizontally mounting the flat tie rest to the upper and lower tie rests, respectively, and vertically and horizontally; (f) installing the wall dies by vertically arranging the wall dies in the floor slab at regular intervals from the earth retaining wall and supporting the wall dies on the flat tie rest through the flat tie; (g) installing a wall by placing reinforcing bars and concrete between the wall formwork and the earth retaining wall; (h) constructing a permanent wall of the underground structure by sequentially repeating the steps (e), (f), and (g) until the underground height while removing struts and wales located in the pouring section So that it is constructed.

In addition, the front end joint member serving as the bandage support is made of a steel material having a channel structure of a U-shaped cross section.

In addition, the flat tie stand is inserted and supported through a through hole for a cradle formed in the sheath connecting member serving as a cradle support.

In addition, a plurality of shear-key grooves for synthesizing the poured concrete and serving as shear keys are further formed in the shear-joint-use shear connection member.

In addition, the flat tie table has a square pipe cross section, and is further provided with a filling hole penetrating vertically at predetermined intervals in the longitudinal direction.

In addition, the shear connector for combined use of the bandage support is formed of a plate-like steel plate having a plurality of through holes for a cradle arranged at regular intervals, and a plurality of shear connection reinforcing bars formed in a horn shape are further joined.

According to the method of constructing the earth retaining and permanent wall using the PHC file and the steel pipe file of the present invention in combination, the steel pipe file is constructed in a relatively smaller quantity than the PHC file, so that an economical construction is achieved. In addition, shear resistance is increased because the concrete wall is composited into the steel pipe file through the shear connection joint used as a tie bracket.

In addition, since the sheath joint for combined use of the wrist strap also serves to support the wrist strap according to the installed position, it is not necessary to provide a separate wrist strap bracket and the work process can be shortened. It is possible to facilitate the installation of the wall formwork through the tie.

In addition, the PHC file and the steel pipe file can be installed together to reduce the thickness of the concrete wall to reduce the amount of concrete pouring, thereby reducing the construction cost.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments of the invention and, together with the description, serve to explain the principles of the invention, Shall not be construed as limiting.
FIG. 1A is a constructional view of a PHC file and a steel pipe file according to the present invention. FIG.
FIG. 1B is a plan view of FIG. 1A. FIG.
FIG. 2A is a state in which a sheathing joint used as a tie-strap support is installed in a steel pipe file shown in FIG. 1A;
Figure 2b is a plan view of Figure 2a.
3 (a) and 3 (b) are perspective views showing various forms of the sheathing joint and shear connection material applied to the present invention.
Fig. 4 is a view showing a state of installation of a wale band and a flat tie stand as a construction state according to the present invention. Fig.
5 is a construction view of a floor slab according to the present invention.
FIG. 6A is an installation view of a mold according to the present invention; FIG.
Figure 6b is a side view of Figure 6a.
7 is a view showing a construction state in which concrete is laid while a formwork is installed according to the present invention.
FIG. 8 is a construction view showing a permanent wall after the form is removed according to the present invention; FIG.
9A is an installation perspective view of a modified shear support shear connector according to the present invention.
FIG. 9B is a side view of FIG. 9A. FIG.
FIG. 9C is a plan view of FIG. 9B. FIG.
FIG. 10A is a view showing a fixed state of the flat tie stand applied to the present invention. FIG.
Fig. 10B is a plan view in a state before fastening the through bolt of Fig. 10A. Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings, but the present invention is not limited thereto.

<Perforation>

First, as shown in FIGS. 1A and 1B, the perforation holes 12 are formed in a row at a predetermined depth at a position L where the earth retaining wall 10 is to be formed. The drilling operation can be done by auger equipment. At this time, the depth of the perforation hole 12 is determined in consideration of the amount of the pile.

<File construction>

Then, two or more PHC files 14 and one steel pipe file 16 are repeatedly inserted into the perforation holes 12 along the direction of arrangement of the perforation holes 12. [ 2 to 4 PHC files 14 are preferable. The work of inserting the file is carried out by using a crane, and at this time, hydraulic press fitting or hitching work can be performed to obtain the end supporting force.

<Construction work>

Subsequently, as shown in FIG. 1B, medium and low pressure grouting (HS-JSP method) is performed on the car body 18 such that the PHC file 14 and the steel pipe file 16 are connected to each other from the back side to the front side. Therefore, the adjacent perforation holes 12 and 12 are connected to each other, and a retaining film is applied to the retaining wall body 10. As a result, it is possible to safely prevent the collapse of the earth retaining wall by blocking the inflow of groundwater when the subterranean wave is constructed.

In this case, the medium-low pressure grouting (HS-JSP method) is one of the grouting methods for retaining walls. It cuts the soil particles from the back surface to the whole surface of the earth retaining wall at medium and low pressure and grouting the cement to the required effective diffusion . The low pressure grouting is applied with the effective diffusion width of 0.4 ~ 0.8m, the pressure (medium and low pressure): 80 ~ 100kg / ㎠, the water cement ratio (1: 1) and the cement amount: 40 ~ 80kg / m .

<File head organization>

Then, the PHC file 14 and the head of the steel pipe file 16 are cut and arranged to have the same height.

Thereafter, a concrete cap beam (not shown) made of reinforced concrete can be constructed. Thus, the PHC file 14 and the steel pipe file 16 can be integrated with the upper part through the concrete cap beam.

<Installation of Excavation and Shear Connectors>

Then, step excavation is repeatedly carried out downward by using the excavation equipment at the front of the PHC file 14 and the steel pipe file 16 until the target depth of the tearing reaches the target depth.

At this time, as shown in Figs. 2A and 2B, a shear connection member 22 serving as a strap support is provided at a predetermined interval in the steel pipe pile 16 for each excavation step. In this embodiment, the sheathing joint member 22 serving as a tie base support is welded to the steel pipe pile 16.

As shown in FIG. 4, the wale 24 is mounted on the wale joint support 22 provided at the corresponding position and the strut 26 is connected to the wale 24 for each position of the set height during the excavation.

The bandage supporting shear connector 22 is made of a steel material having a channel structure of a U-shaped cross section as shown in FIGS. 3 (a) and 3 (b). The cradle-supporting shear connector 22 is formed with a through hole 221 for a cradle and a plurality of shear-key grooves 222. The through hole 221 for the cradle may be formed in the form of an opening as shown in (A) of FIG. 3 or may be formed or formed in the form of a closed hole like (B). The shear-key groove 222 is formed to be combined with the post-installed concrete to serve as a shear key. In the present embodiment, the shear-key groove 222 is formed on the top and bottom of the through hole 221 for the cradle, but the present invention is not limited to this position or number.

In another embodiment, the sheath connecting joints 22 serving as a tie strap support are made of a plate-like steel plate having a plurality of through holes 221 arranged at regular intervals as shown in FIGS. 9A through 9C, And the shear connection reinforcing bars 23 may be further joined together. At this time, the shear connection reinforcing bars 23 can increase the composite behavior of the permanent wall by adjusting the length T when the wall thickness is large.

<Floor slab construction>

Then, as shown in FIG. 5, the bottom slab 100 is installed by placing concrete in a predetermined thickness on the bottom surface of the trowiser.

<Installation of flat tie stand>

Then, as shown in Fig. 6, the flat tie stand 50 is mounted horizontally vertically and horizontally on the upper and lower tie rest supports 22 and 22, respectively.

The flat tie rest 50 is made of a steel material having a square pipe cross section. The flat tie stand (50) may further include a fill hole (501) penetrating vertically at regular intervals in the longitudinal direction. Although the filling hole 501 is used for filling concrete when it is poured, the flat tie stand 50 is fixed to the front end joint member 22 serving as a tie base support using the through bolts 51 as shown in FIGS. 10A and 10B .

In the present embodiment, the flat tie stand 50 is inserted and supported through a through hole 221 formed in the front end joint member 22 serving as a tie base support, and is fixed to the front end joint member 22 serving as a tie base support via welding .

<Wall Formwork Installation>

6, the wall formwork 30 is vertically disposed on the floor slab 100 at regular intervals from the earth retaining wall 10, and then the formwork 30 is placed on the flat tie table 50 to support the wall mold 30.

At this time, one end of the flat tie 52 is connected to the die 30 side via the wedge pin 54, and the other end is welded to the flat tie rest 50. As the form 30, for example, a known euro foam can be used.

<Wall construction>

Next, as shown in FIG. 7, reinforcing bars are installed between the wall formwork 30 and the earth retaining wall 10, and concrete is installed to construct the wall 101.

Thereafter, the installation of the wall formwork 30 and the construction of the wall body 101 are sequentially repeated upwardly to the subterranean height to construct the permanent wall body 102 of the underground structure as shown in FIG.

Here, the concrete is poured while removing the struts 26 and the wales 24 located in the pouring section.

On the other hand, when concrete is cured in each form section, the wall mold 30 is dismantled.

According to the method of constructing the earth retaining and permanent wall using the PHC file and the steel pipe file of the present invention in combination, the steel pipe file 16 is installed in a relatively smaller quantity than the PHC file 14, so that an economical construction is achieved.

In addition, the concrete wall 101 is combined with the steel pipe pile 16 via the shear-joint-use shear connection member 22 to increase the shear resistance.

In addition, since the sheath connecting member 22 also serves to support the wrist strap according to the installed position, it is not necessary to provide a separate wrist strap bracket and the work process is shortened. In addition, the sheath connecting joint 22 serving as a tie strap support can facilitate the installation of the wall dies 30 through the flat tie 52 by allowing the flat tie stand 50 to be installed.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the above teachings. will be. The invention is not limited by these variations and modifications, but is limited only by the claims appended hereto.

14: PHC file
16: Steel pipe file
18: Car lumber
22: Combination sheath joint
24: Wale
26: Strut
30: Wall mold
50: Flat Tie Cradle
52: Flat tie
100: floor slab
101: Wall

Claims (6)

(a) After perforating the ground with a certain depth at the position where the earth retaining wall 10 is to be formed, two or more PHC piles 14 and one steel pipe pile 16 are repeated in the perforation holes And cutting each of the tofu into pieces;
(b) grouting from the back surface of the PHC file (14) and the steel pipe file (16) to the car body (18) from the back surface to the carcass material (18) to construct the carcass to the earth retaining wall body (10);
(c) repeating the step excavation downward from the front of the PHC file (14) and the steel pipe file (16) until reaching the target depth of the trowel, Placing the wrist strap 24 on the wrist strap combination front end joint member 22 provided at the corresponding position and connecting the strut 26 to the wrist strap 24 at a set height position while the connecting member 22 is installed; ;
(d) installing the bottom slab (100) by pouring concrete into the bottom surface of the trowiser with a constant thickness;
(e) a step of inserting the flat tie stand 50 through the through-hole 221 formed in the upper and lower sheathing joints 22, 22 serving as the upper and lower tie holders and mounting them horizontally Wow;
(f) The wall formwork 30 is vertically arranged in the floor slab 100 at regular intervals from the earth retaining wall 10 and then the wall formwork 30 is placed on the flat tie rest room 50 via the flat tie 52 To form a wall mold (30);
(g) installing the wall 101 by placing reinforcing bars and concrete between the wall mold 30 and the earth retaining wall 10;
(e), (f), and (g) are sequentially repeated upwardly to the subterranean height while removing the struts 26 and the wales 24 located in the corresponding pit section, The method of claim 1, wherein the PHC file and the steel pipe file are mixed together. The method according to claim 1,
The method according to any one of the preceding claims, wherein the sheathing joint (22) is made of a steel material having a channel structure of a U-shaped cross section. delete 3. The method of claim 2,
Wherein a plurality of shear-key grooves (222) for composing the concrete with the concrete and serving as shear keys are formed at a plurality of places in the shear-joint-supporting shear connection material (22) Way. The method according to claim 1,
The flat tie stand (50) has a rectangular pipe cross section and further has a filling hole (501) penetrating vertically at regular intervals in the longitudinal direction. The flat tie stand (50) . The method according to claim 1,
The shear connection joints 22 are formed of a plate-like steel plate having a plurality of through holes 221 arranged at regular intervals, and a plurality of shear connection reinforcing bars 23 formed in a conical shape are further joined together Wherein the PHC file and the steel pipe file are mixed with each other.

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