KR101878556B1 - Pre-loading method for fundamental pile - Google Patents

Abstract

The present invention relates to a preloading method of a foundation file, comprising a body portion including a first wedge surface for holding a hydraulic jack, a preceding load, a preceding load, and a load-carrying bolt, And a step of providing a fixture for generating a fixation force by the shear phenomenon and a first wedge surface of the body portion. Thus, even if a separate operation for installing the hydraulic jack for the preceding load is not performed, the work can be performed. This paper presents the preloading method of foundation pile which can maintain the preceding load state by the reaction force even if the reaction force generated after the preceding load is generated.

Description

Pre-loading method for fundamental pile of foundation file

The present invention relates to a preloading method for a foundation file, and more particularly, to a structure in which a hydraulic jack for loading a preceding load is not installed in a foundation concrete, The present invention relates to a pre-load loading method for a foundation pile for ensuring that a preceding load can be firmly maintained.

If the existing structure needs to be enlarged (horizontal and vertical) such as remodeling of the apartment, if the existing structure is subsided, and the existing pile is to be repaired or reinforced, When the structure is to be enlarged, a through hole is formed in the existing bottom plate, and a pile is further applied to the bottom plate.

In order to generate the frictional force on the ground, it is required that displacement occurs between the outer periphery of the pile and the ground due to the frictional force (frictional force between the outer periphery of the pile) and the supporting force.

However, when the additional pile is installed by the conventional method, since the enlarged structure is constructed without displacement between the outer periphery of the additional pile and the ground or in a slight state, the additional load (stress) of the reinforced pile does not act , There is a problem that the existing pile is subjected to more load.

In order to solve these problems, conventionally, a method has been proposed in which the additional load and the end bearing capacity of the reinforced pile are formed by loading the preceding load when the reinforced pile is constructed.

A conventional technique for loading the above-mentioned preceding load is Korean Patent No. 10-1494260 (hereinafter referred to as "Patent Document 1").

Patent Document 1 discloses a structure in which a support rod capable of being fixedly mounted on a ground is formed and then a leading load jack including a screw portion, a stop nut, a mount stand, and a hydraulic cylinder is formed on the support rod, Hydraulic pressure is applied to the hydraulic cylinder to press the pile in a vertical direction to form a preceding load to form an additional load and a tip supporting force.

Korean Patent No. 10-1631219 (hereinafter referred to as Patent Document 2) has also been proposed.

Patent Document 2 discloses that a pile can be inserted into an accurate depth by a high torque force through a method of loading a preceding load on a reinforced pile through a screw method in the case of a pile shaft, So that it is possible to transmit a large force.

However, in the above-described Patent Document 1, it is difficult to apply a large load of several tens of tons or more because the load is loaded by pressing the pile only by the pressing force of the hydraulic cylinder.

Particularly, in order to install the hydraulic jack, there is a problem that the construction time is lengthened because the hole is pierced in the bottom of the foundation concrete and then supported.

Also, in the case of Patent Document 2, there is a problem that the bearing can not withstand a high torque when the normal force is generated through the bearing and is damaged.

In particular, in the case of Patent Document 2, as in the case of Patent Document 1, the hydraulic jack is installed in the foundation concrete, thereby exposing a problem that the construction time is prolonged.

Korean Registered Patent No. 10-1494260 Preloading device of pile and preceding loading method using the same Korea Registered Patent No. 10-1631219 Preliminary Loading Method of Foundation File Construction for Remodeling Construction

In order to solve the above-described problems, the preloading method of a foundation file according to the present invention provides a preloading method of a foundation pile, which can be performed even without performing a separate operation for installing a hydraulic jack for a preceding load It has its purpose.

Another object of the present invention is to enable the components for supporting the load of the preceding load through the hydraulic jack to maintain the state of the preceding load by the reaction force even if the reaction force generated after the preceding load is generated.

According to a preferred embodiment of the present invention, there is provided a method for constructing a foundation of concrete, comprising the steps of: A first step of installing a file in the perforation hole and arranging the head so that the head of the pile can be placed in the core lower than the foundation concrete floor and the second pile step; Wherein a first wedge surface is formed on an outer side of the load plate, a body portion forming a flange including a plurality of fasteners on the first wedge surface, A bolt portion formed outwardly so as to be coupled to a thread groove formed in the inside of the body portion, a plurality of rotation locking holes formed on the upper side, and a load carrying body having a leading load carrying body insertion hole formed therein, A bolt for a load is screwed into a screw groove of a body portion and a leading load carrying body of a round rod or pipe type arranged to protrude further upward than a load carrying bolt is inserted into a leading load carrying body insertion hole of the load carrying bolt step; And a second wedge surface, which is in contact with the first wedge surface of the body portion provided in the third step, is formed on the inner side of the first wedge surface, A fourth step of disposing a plurality of forming fixtures between the core and the body part; And the hydraulic jack of the hydraulic jack is mounted on the upper portion of the jack mount so that the load portion of the hydraulic jack can be brought into contact with the upper surface of the preceding load carrying member. 5 < th > A sixth step of actuating the hydraulic jack installed in the fifth step to press the preceding load carrying member to press the preceding load on the file formed on the lower side of the load plate; When the preceding load to be loaded on the file reaches the reference value in the sixth step, the rotary tool is coupled to the rotary lock hole formed in the load-carrying bolt coupled to the body, and then the rotary tool is rotated so that the lower side of the load- To maintain the preceding load state, And an eighth step of completing the preceding load loading process by sequentially removing the jack mount and the hydraulic jack installed in the fifth step and the preceding load carrying member installed in the third step.

Further, in the fourth step, two to four fixing bodies are arranged at equal intervals.

In addition, in the above step 4, when the fixture arrangement hole having the thread is formed on the fixture body and the fixture body is disposed on the core, the fixture body is joined by using the fixture insertion tool having the thread, And then inserted into the core.

The fastener formed on the flange portion of the body installed in the second step is configured to form a thread. In the fifth step, a thread is formed on the joint portion of the jack rest, which is engaged with the fastener, .

The present invention supports a hydraulic jack for loading a preceding load on a pile through a first wedge surface of the body portion and a second wedge surface of the fixing body, so that the loading of the preceding load can be performed to improve the workability.

Also, in order to fix the hydraulic jack to load the preceding load, the work is performed without forming a separate hole in the foundation concrete, so that it is possible to omit filling work for shortening the work time and fixing the hydraulic jack.

In addition, the first and second wedge surfaces formed on the body portion supporting the hydraulic jacks and the bolts for loading the load and the bolts for loading the load are fixedly coupled by the reaction force generated in the preceding load, The load state can be maintained.

In addition, it is a useful invention to load a high forward load by adopting the method of directly applying the lower weight of the hydraulic jack to a file.

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.
1 is a state diagram showing a first step of the present invention;
Fig. 2 is a state diagram showing the second step of the present invention. Fig.
3 is an exploded perspective view showing the components installed in the third step of the present invention.
FIG. 4 is an exploded perspective view showing another embodiment of FIG. 3; FIG.
5 is a state diagram showing the third step of the present invention.
6 is a photograph of the fixture in the fourth step taken in the present invention.
FIG. 7 is a photograph of the fixture mounting state of FIG. 6; FIG.
8 is a state diagram showing the fourth step of the present invention.
Fig. 9 is a state diagram showing the installation state of the fixture in the fourth step. Fig.
10 is a state diagram showing a state in which the jack rest is installed in the fifth step of the present invention.
11 is a state diagram showing a state in which the hydraulic jack is installed in the fifth step of the present invention.
12 is a state diagram showing a sixth step of the present invention.
13 is a state diagram showing the seventh step of the present invention.
14 is a state diagram showing an eighth step of the present invention.

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.

<First Step>

The first step in the present invention is a conventional step of forming the core 1a and the perforation hole 2a for inserting the piles P into the foundation concrete 1 and the ground 2 as shown in Fig. A detailed description thereof will be omitted.

The perforation hole 2a may be formed to have a diameter equal to or smaller than the diameter of the file P so that the insertion operation of the file P can be performed smoothly and the file P It is preferable that the diameter is larger than that of the perforation hole 2a as the structures for loading the preceding load are inserted.

<Second Step>

This step is a step of arranging the file P in the core 1a and the perforation hole 2a formed in the first step as shown in FIG.

Since the above-mentioned file P is usually longer than the depth of the perforation hole 2a, the upper side of the pile P is placed in the core 1a of the foundation concrete 1 after the pile P is disposed The load plate 10 for transferring the preceding load to the upper side of the pile P is disposed and the present step is completed.

Here, it is preferable that the above-described load plate 10 is formed of a disk having a larger diameter than the diameter of the pile P, but smaller than the diameter of the core 1a.

<Step 3>

In this step, a body 20, a load-carrying bolt 30 and a preceding load-carrying body 40 for loading a preceding load are installed on the pile P inserted in the perforation hole 2a in the second step to be.

3 to 4, the screw groove 21 is formed so as to pass through the center of the body portion 20, and the outer side of the body portion 20 has a smaller diameter as it goes from the lower portion to the upper portion The first wedge surface 22 is formed at the upper side of the first wedge surface 22 and the flange 23 having substantially the same diameter as the lower side portion of the first wedge surface 22 is formed at the upper side of the first wedge surface 22, 23 have a plurality of fasteners 23a formed on the upper surface thereof.

The load-carrying bolts 30 are formed with threaded bolts 31 on the outside so as to be able to engage with the threaded grooves 21 of the body part 20, and a plurality of rotation locking holes 32 Are formed at equal intervals, and a leading load carrying body insertion hole (33) penetrates the inner center.

3, the leading load carrying body 40, which is coupled to the preceding load carrying body insertion hole 33 of the load-carrying bolts 30, is formed in the shape of a pipe as shown in FIG.

Here, the preceding load carrying member insertion hole 33 is formed to have a diameter larger than that of the preceding load carrying member 40 and must be formed so as to be freely inserted and removed.

5, the bolt portion 31 of the load-carrying bolt 30 is screwed to the screw groove 21 of the body portion 20, and the bolt 31 of the load- It is possible to complete this step by inserting the preceding load carrying body 40 into the preceding load carrying body insertion hole 33 of the core 30 and placing it on the upper side of the load plate 10 disposed in the core 1a .

Here, when the bolts 30 are coupled to the body 20, the lower side of the body 20 and the lower side of the bolts 30 may be arranged on the same horizontal line It is preferable to dispose the lower portion of the body portion 20 and the load-carrying bolts 30 in contact with the upper surface of the load plate 10.

Particularly, the preceding load carrying body 40 inserted into the load-carrying bolts 30 is smaller in diameter than the preceding load-carrying body insertion holes 33, and when the upper load carrying body 40 is in contact with the upper surface of the load- The upper side of the preceding load carrying body 40 is positioned at a slightly higher position on the upper side of the load carrying body 30.

<Step 4>

This step is a step of joining the fixing body 50 to be fixed by the shearing phenomenon in contact with the body 10 placed on the upper side of the lower plate 10 in the third step.

6, the fixing member 50 has a friction portion 51 formed on the outer side thereof so as to contact the outer peripheral surface of the core 1a and generate a fixing force by a frictional force, And a second wedge surface 52 of the same size as the first wedge surface 22 for contacting the first wedge surface 22 of the body 20 and fixing the body portion 20 by the wedge principle.

In particular, as shown in FIG. 7, the above-described fixing bodies 50 should be inserted into the core 1a with one or more, preferably two to four, equally spaced apart, 8, a fixing member arranging hole 53 in which a screw thread is formed is further formed on the upper side, and the screw is inserted into the core 1a through the fixing member inserting tool 3 having a screw thread as shown in FIG. The workability and workability can be improved by inserting the second wedge surface 52 of the body portion 20 to a position where the second wedge surface 52 can abut the first wedge surface 22 of the body portion 20. [

<Step 5>

This step is performed by the hydraulic pressure supply means 4 so as to press the pile inserted into the core 1a and the perforation hole 2a and load the preceding load in the second step as shown in Figs. (60) including a movable rod portion (71) and a hydraulic jack (70) capable of supporting the hydraulic jack (70), wherein the jack base (60) is provided with a coupling portion (61) To the fixture (23a) of the base (20).

Here, in order to improve the fixing force when the jack rest 60 is coupled with the body 20, the fastener 23a and the engaging portion 61 may be threaded to form a thread.

<Step 6>

This step is for loading the preceding load on the file P by using the components installed in the first to fifth steps.

11, when the hydraulic pressure is supplied to the hydraulic jack 70 by using the hydraulic pressure supply means 4, the rod portion 71 is lowered to press the upper surface of the preceding load transmission body 40.

Then the lower side of the preceding load carrying body 40 presses the upper side of the load plate 10 and the lower side of the load plate 10 which receives the pressing force presses the head of the file P, ), The preceding load is loaded.

Meanwhile, the jack rest 60 to which the hydraulic jack 70 is coupled receives a reaction force when the rod 71 of the hydraulic jack 70 is operated.

Since the jack cradle 60 described above is fixedly coupled to the body 20, the reaction force generated by the hydraulic jack 70 in the course of loading the hydraulic jack 70 in the file P, (20) in the upward direction.

The reaction force for moving the body portion 20 upward acts on the second wedge surface 52 of the fixture 50 abutting against the first wedge surface 22 of the body portion 20, 22, and 52, the body portion 20 is more firmly fixed to the fixing body 50. [0064]

In addition, a force acting on the wedges 22 and 52 acts to push the fixture 50 in the direction in which the core 1a is formed.

Here, on the outer circumferential surface of the above-mentioned fixture 50, a frictional portion 51 of a thread-like shape is formed.

Therefore, when the load P is loaded on the pile P using the hydraulic jack 70 as described above, the fixture 50 is held by the frictional portion 51 formed on the fixture 50 by the body portion 20, The first wedge surface 22 of the body portion 20 and the second wedge surface 52 of the fixing body 50 are fixed to each other by the fixing of the body portion 20, Bonding power is also improved.

That is, as the amount of preceding load applied to the file P increases, the coupling force between the body portion 20 and the fixing body 50 also increases.

12, since the body 20 and the load-bearing bolts 30 coupled thereto are not further raised or lowered, only the preceding load-carrying body 40 is lowered and loaded So that the preceding load is loaded on the plate (10) and the file (P).

<Step 7>

This step is a step for holding the preceding load after the loading of the preceding load is completed in the above-described sixth step P, and is a step of holding the body part The load-carrying bolts 30 coupled to the load-carrying bolts 20 are rotated to abut against the upper surface of the load-carrying plate 10, so that the loaded loads can be maintained. At this time, Although it is not shown in the figure, it can be rotated by using a tool inserted into the rotation lock hole 32 formed in the load-carrying bolt 30. [

This is because in the sixth step, when the file P is loaded with the preceding load using the hydraulic jack 70, a firm fixing force between the body 20 and the fixing body 50, the fixing body 50 and the core 1a is generated It is possible because it is.

That is, when the hydraulic jack 70 is removed in a state in which the load load bolts 30 are rotated to hold the preceding loads of the load plate 10 and the pile P, the load P is applied to the load plate 10 and the load plate 10 And a reaction force opposite to the preceding load which has been lost is generated on the lower side of the load-carrying bolts 30 screwed to the body portion 20.

This reaction force acts to move the body portion 20 in the upward direction. This reaction force is applied to the body portion 20 so that the coupling force between the body portion 20 and the fixing body 50 can be more firmly maintained .

Therefore, when the force due to the reaction force of the pile P acts on the body 20 in a state in which the fixation force previously held between the body 20 and the fixture 50 and the core 1a is maintained, .

<Step 8>

In this step, the hydraulic jacks 70 and the jack rests 60, which have loaded the preceding loads in the file P after the seventh step, are removed. By removing the hydraulic jacks 70 and the jack rests 60, the preceding load- It can be completed.

As described above, according to the present invention, the hydraulic jack 70 to be loaded in advance is formed in the body portion 20 inserted into the core 1a without forming a separate hole in the base concrete 1, thereby improving the workability It is possible to shorten the incidental cost and the construction time, and in particular, the reaction force generated when the preceding load is loaded can maintain the preceding load, and thus the reliability of the construction can be secured.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to be illustrative of the present invention and not to limit the scope of the invention. It is expressly evident to those of ordinary skill in the art.

1: Basic concrete
1a: Core
2: Ground
2a: Perforation hole
3: Fixture insertion tool
4: Hydraulic supply means
P: file
10: Loading plate
20:
21: Screw groove
22: first wedge face
23: Flange
23a: Fixture
30: Load bolt
31:
32: rotation lock hole
33: leading load carrying body insertion hole
40: preceding load carrier
50:
51:
52: second wedge surface
53: Fixing arrangement hole
60: Jack cradle
61:
70: Hydraulic Jack
71:

Claims (4)

A first step of forming a core 1a of the base concrete 1 and forming a perforation hole 2a in the ground after selecting a position to which the pile P is to be applied;
The pile is arranged in the perforation hole 2a in the first step so that the head of the pile P can be placed in the core 1a at a position lower than the floor of the foundation concrete 1, , A second step of installing a loading plate (10) having a circular shape on the head of the pile (P);
A screw groove 21 is formed on the upper side of the load plate 10 and a first wedge surface 22 is formed on the outside of the load plate 10. On the upper side of the first wedge surface 22, A body portion 20 forming a flange 23 including a fixture 23a is disposed and threaded outward so as to be engaged with a thread groove 21 formed inside the body portion 20 And a load carrying bolt 30 having a plurality of rotation locking holes 32 formed on the upper side and a preceding load carrying body insertion hole 33 formed on the inside thereof, And is provided with a round bar or a pipe in the form of a round bar or a pipe which is screwed to the screw groove 21 and is disposed on the preceding load carrying body insertion hole 33 of the load carrying bolt 30 so as to protrude further above the load carrying bolts 30. [ A third step of coupling the load carrying body 40;
A frictional portion 51 having a thread form is formed on the outer side so as to be in contact with the surface of the core 1a formed in the first step and a first wedge 51 of the body portion 20 provided in the third step is formed on the inner side, A fourth step of disposing a plurality of fixing bodies 50 forming a second wedge surface 52 capable of coming into contact with the surface 22 between the core 1a and the body portion 20;
The engaging portion 61 of the jack mounting table 60 is engaged with the fixing hole 23a formed in the flange portion 23 of the body portion 20 in the third step and then the hydraulic jack 70 A fifth step of installing the load unit 71 of the hydraulic jack 70 so that the load unit 71 can come into contact with the upper surface of the preceding load carrying member 40;
A sixth step of operating the hydraulic jack 70 installed in the fifth step to press the preceding load conveying body 40 to press the preceding load on the file P formed on the lower side of the load board 10;
When the preceding load to be loaded on the file P reaches the reference value in the sixth step, the rotary tool is coupled to the rotation lock hole 32 formed in the load-carrying bolts 30 coupled to the body 20 A seventh step of maintaining the preceding load state by allowing the lower side of the load-carrying bolts (30) to come into contact with the load plate (10);
And an eighth step of completing the preceding load setting process by successively removing the jack cradle 60 and the hydraulic jack 70 installed in the fifth step and the preceding load carrying body 40 installed in the third step Prefabricated loading of foundation files characterized by. The method according to claim 1,
In the fourth step, the fixture 50 is installed by arranging 2 to 4 places at regular intervals. 3. The method according to claim 1 or 2,
A fixture insertion tool 53 having a screw thread is further formed on the fixture 50 in the fourth step to form a fixture 50 in the core 1a, 3, the fixing body 50 is engaged and then the fixing body 50 is inserted into the core. The method according to claim 1,
The fastener 23a formed on the flange 23 of the body 20 installed in the second step is configured to form a thread and the jack holder 60 for fastening to the fastener 23a in the fifth step, Wherein a screw thread is formed in the coupling portion of the base pile so as to be able to be coupled to the fixture (23a).

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