KR20010019079A - Precast steel Plate &Concrete Pile Structure of Semi Down Wall Construction System - Google Patents

Abstract

PURPOSE: A precast steel pile for simple reverse concreted retaining wall construction is provided to control surrounding ground subsidence when constructing a temporary retaining wall and a reverse concreted structure simultaneous with a sequence-excavation work. CONSTITUTION: A precast steel pile for simple reverse concreted retaining wall construction comprises; a precast I-shaped steel pile (19) for constructing a retaining wall (15) and a reverse concreted external retaining wall (14) simultaneously by enhancing deflection, shearing and compressive stress with the increased section modulus and geometrical moment of inertia by attaching a stud bolt to a stiffening plate reinforced to a symmetric structure of repeatedly crossed necessary parts inside an I-shaped steel pipe of a temporary retaining wall for a reverse concreted retaining wall (15) construction, erecting the steel pipe, provided with a lower grouting injection opening bored through upper/lower anchor plates, to an underground boring hole, filling with a grout and setting, and placing a high strength concrete to the inside of the steel pipe, wherein a tensile force stiffening steel plate reinforces the inside of the steel pipe and a stud bolt (18) is attached to the stiffening plate to supplement a shearing stress; a wire rope which reclaims after taking the stiffening plate to the inside of the steel pipe; a clasp which joints and disjoints the wire rope easily; an upper anchor plate comprising a deformed bar for hanging the contour, a lower grouting injection pipe, and a high strength concrete injection opening; a lower anchor plate where a lower grouting injection pipe penetrates; a lower grouting injection pipe bored through upper/lower anchor plate; a reinforcing bar joint coupler which connects the deformed bar and fixes a circumferential bed plate; a circumferential bed plate for the stud bolt; a circumferential bed plate (13) for setting the arrangement of a deformed bar; a lagging (15) installed on the rear of a steel pile (19) and used for a mold form of an adverse concreted retaining wall and a temporary sheeting; a variable spacer (17) for securing of protective covering.

Description

Precast steel pile for simple reverse casting retaining wall construction {Precast steel Plate & Concrete Pile Structure of Semi Down Wall Construction System}

The present invention relates to a precast steel pile for the construction of a simple reverse casting retaining wall for suppressing the settlement of the surrounding ground when constructing a temporary soil wall and constructing step-by-step earthwork and reversal structure at the same time, and a retaining wall construction method using the same.

In the case of reverse casting for resolving civil complaints related to the ground caused by the excavation work on the site near the urban building and the settlement of the structure, the underground continuous wall is usually used as the retaining wall. Inadequate

Considering this point, the prior art for reversing the construction of temporary earthwalls is based on the economical perforated cross section of the device and construction method for constructing temporary wall of temporary wall of Patent No. 115877 for permanent wall. If the height of the interlaminar floors of neighboring living floors and machinery rooms where the horizontal force acting on the earth wall is greatly increased due to the small cross-sectional coefficients or small allowable stresses is high, the gap between the thumb piles should be narrowed or other than the permanent support beam / slab reverse casting structure. The construction of additional backing braces by breaking additional external retaining retaining walls by cutting them at each stage of excavation, but the delay of air has been a factor in the increase of cost.

In addition, after constructing a permanent concrete supporting beam / slab of permanent concrete structure supporting the earth wall by excavation stage using the temporary earthquake earth wall, a normal reverse casting beam / slab that separates the outer retaining wall step by step from the foundation layer is constructed. After pre-installation, post-install the external retaining wall, and assemble the vertically deformed rebar of the pre-cut retaining wall together with the reinforcing bar / slab's deformed rebar in consideration of the up and down joint length of the vertical reinforcement of the retaining wall integrated with the pre-construction beam / slab. Placing concrete increases the cost of construction because the subsequent retaining walls generate two reinforcing bars per floor.

In addition, the horizontal attachment of the stud bolts for fixing the H-shaped steel piles and the beam slab structure for back-pouring integrally is fixed. The stud bolts subjected to high heat during welding instantly melt, and the molten water flows down during welding. The horizontal attachment of the stub bolts has the disadvantage that additional reinforcement welding is required because of poor joining.

On the other hand, even if the construction of the reverse casting support beam / slab of the permanent concrete structure using the temporary earth wall, and then the external retaining wall to separate the foundation wall from the foundation layer, even if the thumb pile is a type of vibration hammer in the ground drilling hole Since it is settled on high-strength residues (wangs), settlement deformation is caused by loading of reverse casting loads, and serious cracking occurs in the reverse casting beam / slab structure.

In addition, the spacer for earthenware earth plate in the Utility Model Registration No. 35446 has a disadvantage in that the efficiency is noticeably lowered because different deformation gaps occur when the verticality of the thumb pile is poor due to the lack of the variable function.

The present invention is to provide a steel pile that can suppress the settlement of the surrounding ground when the construction of the temporary earthen wall wall and the construction of the step-by-step excavation and reversal structure at the same time.

In order to achieve the above object, first, the thumb pile having a sufficient coping force to the horizontal stress acting on the earth wall earth wall is stable construction of the high external retaining wall structure even if the pile section is reduced without narrowing the installation interval or support interval, second thumb pile The construction of the reinforcement structure and the stabilization of the reinforcing structure and the external retaining wall and supporting beams / slabs used as the pile for the reversal placement Even if the projected section of the structure is excessively violated due to the shortening of airtightness and cost, which reduces the joint volume of the vertical reinforcing bar by half compared with the normal temporary earth wall reversal construction, and the poor verticality of the thumb pile, Precise construction of the structure, with the fifth thumb pile retained inside the retaining wall When the reinforced concrete retaining wall is replaced with a steel thumb retaining structure, a street thumb pile or earth anchor thumb pile that conforms to the normal thumb pile standard of the sixth type of burial construction, 1.8, which is the normal height of the support of the thumb pile It should be possible to build more economically underground structures safely and quickly with thumb piles that can increase the construction efficiency of the structure with one support for each floor by increasing ˜2.5m to at least 4.5m. The present invention implements this.

1 is a reverse casting Pc for -Section of the river stakes

2 is a cross-sectional view taken along the line A-a of FIG.

3 is a cross-sectional view taken along the line B-b of FIG.

4 is a cross-sectional view taken along the line C-c of FIG.

5 is a cross-sectional view of reinforcing the tensile strength of the steel pile

6 is a sectional view of reinforcing shear force of steel pile

7 to 13 is a construction sequence diagram of the reverse casting work process using the steel pile

<Description of the code | symbol about the principal part of drawing>

1: steel pipe 2: upper fixing plate

3: circumferential support plate 4: lower fixing plate

5: bolt 6: hook

7: deformed bar 8: Kepler

9: grouting injection pipe 10: concrete inlet

11: ground drilling hole 12: grouting

13: Reversal Beam / Slab 14: External Reversal Retaining Wall

15: temporary earth wall (plate) 16: joint reinforcement plate

17: variable spacer 18: stud bolt

19: steel pile 20: reinforcement plate

21: high strength concrete 22: wire rope

23: variable hanging beam / slab formwork

24: outer wall

In Fig. 1, the steel pile 19 for backwashing mudstone is The inner part of the steel pipe (1) in order to reinforce in a most economical way the welded steel pipe (1) suitable for a predetermined length of use, and then reinforce the tensile and compressive forces that intersect on the same cross section as the steel pipe (1) Reinforced by adding a reinforcement plate 20 to the portion where the tensile force acts in, and the site where the shear force acts to reinforce both ends of the reinforcement plate 20 with a stud bolt 18.

The portion of the compressive force is skipped and filled with high-strength concrete 21 and repeatedly reinforced in the same manner as the underground multi-layer structure to form the steel pile 19 at a predetermined use length. In order to make a proper connection, first, the V-cutting butt welds and polishes the end of the butt welded steel pipe 1 to form a steel pile 19 having a reinforcing plate 16 attached to the joint of the steel pipe 1 around the joint. Both fixing plates 2 and the lower fixing plate 4 on the upper end of the steel pipe 1 are welded and fixed.

In FIG. 2, a kepler 8 for reinforcing bars is attached to be used for suspending vertical deformed reinforcing bars 7 for reverse pouring retaining walls that penetrate the outer fixing plate 2 of the steel pile 19. .

In FIG. 3, a wire rope is attached to the hook 6 of the reinforcing plate 20 to which the hook 6 and the stud bolt 18 are attached to reinforce the necessary portion inside the steel pipe 1 with the reinforcing plate 20. (22) is hooked into the inside of the steel pipe (1) and aligned with the point to be installed, and then screwing the bolt (5) by drilling a screw hole in the reinforcement plate 20 portion from the outside of the steel pipe (1), the steel pipe (1) Reinforcement of the necessary portion inside the reinforcement plate 20 and the stud bolt 18.

Another part of the wire rope 22 can be recycled because the other end of the wire rope 22 used to pull the reinforcing plate 20 into the inside of the steel pipe 1 is peeled off from the steel plate hook 6. have.

In FIG. 4, in order to construct the beam / slab 13 for supporting the steel pile 19 inside the outer retaining wall 14, the vertically shaped reinforcing bar 7 of the outer retaining wall 14 is reversed to the steel pile 19. Supporting beams on steel piles (19) by placing them on the pedestal (3) and the Kepler (8) for the purpose of pour-in, and for supporting the beam / slab (13) for the construction of the next layer reversal structure according to concrete striking and stepwise excavation. Avoiding horizontal attachment with a high probability that the stud bolts 18 for fixing the structure of the slab 13 will be misplaced, and fixing of the reversal structure can be carried out using the deformed reinforcing bar 7 of the outer retaining wall 14 and the circumferential plate 3 and Kepler. Since (8) is used for hanging, it is possible to construct safely and simply and quickly.

At this time, the circumferential support plate (3) is a double fixing structure consisting of a circumferential support plate (3) capable of freely performing the reinforcement position of the deformed reinforcing bar (7) to accommodate the change in the inner thickness of the outer retaining walls (14, 24) for each excavation step. .

In FIG. 6, the steel pipe 1 reinforced by the reinforcing plate 20 is rotated 180 ° to be limited to a portion in which the tensile force is applied to the inside of the opposite side, and the stud bolt 18 is attached to the reinforcing plate 20 in the same manner. As the steel pile 19 is remarkably increased in section modulus and cross-sectional secondary moment, the strength of bending and shear is superior, and the strength of the steel pile 19 is increased. When the lower grouting injection pipe 9 penetrates the lower fixing plate 2/4 and is inserted into the ground drilling hole 11 and the steel pile 19 is fixed on the drilling residue, Injecting compressed air into the grouting injection tube 9 while filling the grouting in the lower end of the ground drilling hole 11 while floating the drilling residues, the steel pile 19 is maintained in a stable fixing state and another internal inlet 10 The inside of the furnace steel pipe (1) is made of high strength concrete Fill and cure.

7 to 13 illustrate the step-by-step of the construction of the building using the steel pile 19, the left side of the figure is a process diagram for constructing the external reinforcing retaining wall 14 and the right side of the smooth outer retaining wall 14. to be.

First, the steel pile 19 is inserted into the ground drilling hole 11, and compressed air is injected into the lower grouting injection tube 9 penetrating the steel pile 19, while the precipitated puncture residue is raised to grout ( 12) and the high-strength drilling residue and cement milk at the bottom of the ground drilling hole 11 to form a stirring fixing bulb by the compressed air.

After filling and curing concrete in the steel pile 19, excavating and arranging the ground for building the first floor beam / slab above the ground, casting concrete and drawing the cast line, and then hanging the hanging beam / slab formwork (23). ) Assemble and reinforce the ground-floor beam / slab concrete to build and reinforce the design strength, and then develop the ground strength. Variable gap (17) is provided between the back of the steel pile (19) and the external retaining wall (14) formwork common earth plate in order to install the temporary earthenware earth wall (15) and the formwork for building the external retaining wall (14). Form. The variable spacer 17 is divided into a body and an exterior, and the exterior is constructed with the same shape as the design by securing a change clearance at the back of the thumb pile having a poor verticality with a screw that moves forward and backwards around the body.

A variable clearance is formed by the variable spacer 17 between the rear surface of the steel pile 19 and the earth plate, and then the horizontal horizontal reinforcing bar of the outer retaining wall 14 is disposed between the variable spacers 17 and concrete-pumped. Since the steel frame 19 is installed inside the outer retaining wall 14 by the earth plate variable spacer 17 forming the reinforcing bar of the outer retaining wall 14, the outer retaining wall 14 is improved by the steel structure. The support is lowered to the first floor slab (13) above the ground by placing the variable hanging beam / slab formwork (23) to the location of the first floor beam / slab (13) and placing the concrete of the first floor beam / slab (13). While retaining, the variable suspended beam / slab formwork 23 may be constructed together with the external reversal retaining wall 14 together with continuous excavation without a pit excavation stand, or subsequently in turn from the base layer separately. ) Can be built. The principle is to apply selectively according to the distribution status of the soft ground, excavation of groundwater level and surrounding civil complaints due to the excavation, and the first basement may be located in the soft ground, so the ground reinforcement order grouting of the temporary earth wall 15 is explained. And drawing notation are omitted.

Under the variable hanging beam / slab formwork (23), while installing the temporary earthenware earth wall (15) and the external retaining wall (14) formwork on the back of the river pile (19), the basement 2 is continuously operated without waiting for excavation heavy equipment. Simultaneous excavation of the layers is carried out.

The variable hanging beam / slab formwork (23) is lowered to the basement 2 floor and settled in the basement 1 floor, and the basement 2 floor reverse casting support beam / slab (13) of the river pile (19) is constructed. Construction and installation of temporary soil wall (15) and reversal beam / slab (13) for the basement 3rd floor, after digging the excavation surface, striking the foundation floor concrete, and then the variable hanging beam / slab formwork Dismantle (23) and take it out to the ground.

As described above, the present invention is effective for constructing a steel frame external retrocast retaining wall as a temporary earthenware earth wall. -When the reverse pile is installed in the basement with high interlayer height while the earth pressure acts as a river pile, it has sufficient response to the horizontal force acting on the temporary earth wall. -The internal necessary part of the type steel pipe is reinforced with steel plate, stud-bolt, and high-strength concrete to increase the section modulus and cross-sectional secondary moment, which greatly increases the strength of bending and shear, so that the installation spacing or support of the backstacking pile It can increase the spacing or reduce the cross section of the thumb pile effectively.

In addition, the river pile is built into the ground drilling hole for drilling reverse casting -Compressed air is injected into the steel pipe and the external grouting injection pipe of the steel pile to fill the cement grouting milk while floating the perforated residue to form the bottom bulb of the ground perforated hole so that the steel pile can be firmly settled and kept stable all the time. have.

In addition, it is easy to maintain the verticality of the earth plate even if the verticality of the thumb pile is poor by forming a variable play between the back surface of the steel pile, the common earth plate formwork and the variable spacer for forming the gap, so that it is easy to construct the structure as designed. It is easy.

In particular, when constructing external retaining wall and beam / slab structure with high earth pressure and high reversal floor height, the vertical reinforcing bar of the retaining wall is used as the reinforcing reinforcing reinforcing bar in the upper fixing plate of the steel pile and hung with the supporting plate and Kepler. Supporting the retaining wall in the upper fixing plate of the steel pile in order to securely and easily build the suspended casting structure without worries about the secondary construction of the horizontally mounted stud bolt for fixing the support beam / slab structure to the steel pile by supporting the concrete Vertical reinforcing bars are used as vertical reinforcing bars to be suspended by supporting plates and Kepler, and the beam / slab structure is constructed. We can cut point in half.

And since the river pile and the earth plate variable spacer, the hanging reinforcement, the backing plate, the Kepler variable hanging beam / slab formwork can be effectively used, the steel pile of the temporary earthquake earth wall can be maintained inside the inverted retaining wall. Reinforced concrete retaining wall is structural improvement to steel concrete retaining wall.

In addition, since the steel pile and the earth plate variable spacing are used, there is a variable function of the earth plate variable spacer which perfectly forms the verticality of the reverse casting retaining wall even if the verticality of the steel pile is poor. A can be formed to achieve a perfect vertical angle of the backpouring retaining wall.

In addition, the excavation work can be carried out continuously under the variable hanging beam / slab formwork without the excavation waiting time, so that the inverse casting structure can be constructed safely and quickly. When replacing with a pile of thumb or a steel anchor, a temporary pile wall thumb pile that can increase the efficiency of the temporary earth wall with one support for each floor is increased by at least 4.5m, which is a normal support height of 1.8 to 2.5m. There is no shortage of use, so it is very effective in suppressing the surrounding settlement caused by excavation work.

Claims (3)

Temporary earth retaining earth wall for construction -Upper / lower fixing plate (2/4) of a skipped form by attaching a stud bolt (18) to a reinforcing plate (20) reinforced with a symmetrical structure that is repeatedly staggered with necessary parts inside the steel pipe (1). The steel grout (1) assembled with the lower grouting injection pipe (9) penetrating through is inserted into the underground drilling hole (11) to fill and grout the grouting (12), and the high-strength concrete (10) to the inside of the steel pipe (1). Pc increased the cross-sectional coefficient and the cross-sectional secondary moment to increase bending and shear and compressive stress, thereby making it possible to simultaneously construct the earthwall earth wall 15 and the inverted exterior retaining wall 14 with high interlayer height. -Steel pile (19), the inside of the steel pipe (1) to reinforce the tensile strength reinforcing steel plate 20, and at the same time the stud bolt 18 is attached to the reinforcing plate 20 to supplement the shear stress, The wire rope 22 which pulls the reinforcement plate 20 into the steel pipe 1 and recovers it, and the hook 6 which is easy to catch and release the wire rope 22, and the reinforcing bar 7 for hanging the outer part. The upper fixing plate 2 having a lower grouting injection tube 9 and a high-strength concrete inlet 10, a lower fixing plate 4 through which the lower grouting injection tube 9 penetrates, and upper and lower fixing plates 2, 4. Lower grouting injection tube (9) penetrating through), the reinforcing bar Kepler (8) for connecting the reinforcing reinforcing bars (7) and fixing the tube support plate (3), and the tube support plate for the stud bolt (18) (3), and installed on the back of the square tube support plate 13 for the reinforcement of the reinforcing bar (7) and the steel pile (19) Of toryupan used for the mold and retaining the hypothesis (15), the toryupan 15 reinforced coating secured variable interval claim 19 simple stations placing the retaining wall construction precast steel pile for yirwojin as for the clearance of the variable and the placement station a retaining wall. Steel pile 19 and its function as described in claim 1, and the reinforcing bar joint Kepler (8), round tube base plate (3), earth plate (15), earth plate variable spacer (17), variable hanging beam / slab formwork system ( 23) Utilize 23) to build an external retaining wall by retrofitting with a non-temporary retrocast beam / slab in a basement of 4.5m or more. 3. The steel pile (19) and its function and reinforcing bar coupling (8) square tube support plate (3) earth plate (15) earth plate variable spacer (17) variable suspending beam / slab formwork system (23) A method of constructing external retaining walls sequentially from the base layer after constructing a reverse casting beam / slab effectively.