JP3156066B2 - Jack-up device for concrete slab level correction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jack-up for a concrete level correction method in which initial settlement can be reduced in a short period of time when uneven settlement occurs on a concrete soil floor constructed on soft ground. Related to the device.

[0002]

2. Description of the Related Art In the case of uneven settlement on concrete floors such as runways and aprons of airport facilities constructed on soft ground, it is necessary to correct the floor level for a short period of time. Desired. Conventionally, an overlay construction method for recovering flatness by placing ultra-high-strength concrete on the sinking surface has been applied. The overlay construction method can be constructed simply by measuring the floor level, roughing the surface of the floor concrete and filing work, so the initial cost is low.However, if dust is generated by filing work and the whole floor is thickened and corrected, It has disadvantages such as the necessity of rebuilding the floor line, the need to modify the floor exit level, and the possibility of cracking easily in the thin part of the overlay. In addition, when the upper layer of the concrete floor is prestressed concrete pavement (hereinafter referred to as PC pavement), a pressure plate is post-installed on the lower layer of the improved ground, and a lift-up metal fitting is attached to the upper layer PC pavement to lift up. Although the lift-up method of the method of PS Co., Ltd., etc. is being constructed, there are disadvantages such as the time required for hole drilling due to the thick upper concrete layer, the high initial cost, and the time required for jack-up. Therefore, there has been a long-awaited appearance of a jack-up device for a repair method, which can reduce initial costs and can easily handle part or the whole of the concrete floor.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and is to be solved by the following technical concept. (1) In the overlay method, there are issues such as environmental pollution problems of filing work, high floor level, cracks easily occur in the thin part of the overlay, etc., so it is better to correct it by jacking up the sinking upper layer. Good. For this purpose, a relatively thin reinforced concrete block slab is laid on the top layer, the minimum block slab is jacked up and modified, and the middle layer is reinforced concrete mat slab and the bottom layer is a cement safe processing method etc. A concrete slab level modification method in which a concrete floor is constructed with a three-layer structure of improved ground and a release sheet is interposed under the uppermost block slab to facilitate jacking up of the block slab. (2) It is desirable that the jack-up device should be simple, inexpensive, and capable of rapidly responding. The block plate of the uppermost layer has a Y around the periphery of a support having a screw hole for a lifting bolt. A lifting connector consisting of three pipes is buried at the apex of the shape, and when uneven settlement occurs, a reaction force bolt is erected in the pipe using the connector and the main bolt is set up. A lifting bolt is screwed into the center of the column to assemble the upper and lower reaction force plates, and the upper reaction force plate is jack-received and the lower reaction force plate is provisionally received for jack-up.

That is, the solution of the present invention is constituted as follows. (1) The soil concrete floor on the soft ground has a three-layer structure consisting of a reinforced concrete block slab of the uppermost layer, a reinforced concrete mat slab of the middle layer, and an improved ground of the lowermost layer by the cement safe processing method or the like. A release sheet is interposed between the upper layer and the middle layer, and three pipes are erected on the top of the block plate at the apex of the Y-shape on the periphery of the main column having the screw holes for lifting bolts as the center. And a lifting connector fixed at its upper and lower ends with a top plate and a load receiving plate is integrally buried, and is brought into contact with the load receiving plate so that a reaction force is applied to the middle layer mat slab. A receiving plate is laid, and the top of the top plate is always covered with a lid. If uneven settlement occurs, the lid is removed.
The reaction bolts are inserted into the three pipes, and they are erected on the reaction force receiving plate. Two upper and lower receiving nuts are screwed onto the three reaction bolts to support the upper and lower two reaction plates. A lifting bolt is inserted into the center hole of the upper and lower reaction force plates, the lower end thereof is screwed into the above-mentioned support screw hole, and two upper and lower holding nuts are screwed on the upper portion thereof, and With the holding nut, the jack placed between the upper holding plate and the upper reaction plate is fastened from above, and with the lower holding nut, the lower reaction plate is fastened between the lower receiving nut and the jack. The jack-up device for the concrete slab level correction method, characterized in that the uppermost block slab can be jacked up on the upper reaction plate via the upper holding nut by the operation of. (2) When the uppermost block plate is jacked up by the operation of the jack, the gap generated in the lower presser nut is retightened, the lower reaction plate is retightened, and the jacked-up block plate is moved downward. The jack-up device for concrete level correction method according to (1), characterized in that it can be temporarily received on a lower reaction plate via a holding nut. (3) Three-dimensionally measure the floor level of the concrete concrete floor where uneven settlement has occurred, determine the minimum jack-up construction block version necessary for correcting uneven settlement from the top block version, and jack up A jack-up device for a concrete slab level correction method according to the above mode (1) or (2), characterized in that it is made possible.

[0005]

[Embodiment] An embodiment of a jack-up device for a concrete slab level correcting method according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory view of a three-layer structure of the concrete floor of the present invention. In the present invention, the concrete floor 1 on the soft ground E is composed of a number of relatively thin reinforced concrete block plates 2a. And the middle layer is a reinforced concrete mat slab 3, and the lowermost layer is an improved ground by a cement stabilization method (for example, -axial compressive strength Qu = 10 Kg / cm ² ). The upper block 2 is jacked up as detailed below. The ratio of the thickness of each layer is as follows: top layer: middle layer: bottom layer is 2:
Although the ratio is 5: 5, it is appropriately set according to the floor load similarly to the strength of the improved ground. In addition, a vinyl sheet 5 is interposed under the block plate 2 to facilitate separation when jacking up.

FIG. 2 is an exploded longitudinal sectional view of a lifting connector buried in a block slab on the uppermost layer of a three-layered concrete floor according to the present invention, and FIG. 3 is a cross-sectional view taken along the line AA. FIG. In the present invention, in order to be used for jacking up the top block block 2, each block plate 2 a is provided with a main pillar 6 having a screw hole 6 a for a lifting bolt formed in the center in the entire thickness thereof. 120 ° pitch Y around the periphery
Three pipes 7, ... are erected at the apex position of the shape, connected between them by ribs 6b, and a top plate 8a and a load receiving plate 8b are arranged on both upper and lower ends thereof, and are integrally formed. The lifting connector 9 is buried in advance. A reaction force receiving plate 10 is laid on the upper surface of the mat slab 3 in the middle layer so as to be in contact with the bottom surface of the load receiving plate 8b. The top plate 8a is always covered with the lid 11, and the upper surface of the lid 11 is flat following the upper surface of the block plate 2.

When uneven settlement occurs in the three-story soil concrete floor 1 shown in FIG. 1, the floor level is three-dimensionally measured and the minimum number of construction block slabs 2a relative to the uppermost reinforced concrete block slab 2. To determine. FIG. 4 shows the set-up state of the jack-up device. The lid 11 is removed from the construction block plate 2a to expose the screw hole 6a of the main pillar 6 at the center and the three pipes 7 at the periphery. Each of the three pipes 7,... Is inserted with a reaction force bolt 12,... Having the same length, and is set upright on the upper surface of the reaction force receiving plate 10 laid on the middle layer mat slab 3. Then, two upper and lower receiving nuts 15 and 16 are respectively screwed into the three reaction force bolts 12 and so on, and the upper and lower two reaction force plates 13 and 14 are inserted into the three receiving bolts and received from below. To support. 13b and 14b are holes for insertion. Also,
Center holes 13a, 14 of upper and lower reaction plates 13, 14
a, a lower end of which is screwed into a screw hole 6 a of the main column 6 of the connecting tool 9,
The holding nuts 18 and 19 are screwed. A jack 20 is inserted into the lifting bolt 17, placed on the upper reaction plate 13, and fastened from above with a holding nut 18. On the other hand, the lower holding plate 19 fastens the lower pressure plate 14 directly from above. Thus, the jack-up device 21 is placed on the block plate 2a.
Are easily assembled facing the connecting tool 9.

The upper reaction plate 13 functions to receive the jack 20. When the jack 20 is operated, the upper reaction plate 13 shown in FIG.
The upper part 20a is raised with respect to the lower part 20b, the upper holding nut 18 and the lifting bolt 17 are pulled up, and the uppermost block slab 2a is lifted via the threaded connecting tool 9, thereby forming the middle layer mat slab. 3, a cavity 22 is formed. By this jack-up, the block plate 2a and the upper surface are restored to the initial horizontal state. In addition, the jack-up causes the lower presser nut 19 to be separated from the lower reaction plate 14, thereby generating a gap 19a.

When the number of construction block plates 2a is large, a jack-up device 21 corresponding to the number is required, but the cost of the jack 20 as a component of the jack-up device 21 becomes a problem. The jack-up device 21 of the present invention, in the jack-up state, retightens the gap 19a generated in the presser nut 19, retightens the lower reaction force plate 14 as shown in FIG.
4 can temporarily receive the jack-up state of the block plate 2a, and the upper holding nut 18 and the jack 20 can be removed. In this case, the nut 19 may be tightened downward, or the nut 16 may be tightened together with the reaction force plate 14.
May be tightened upward. By sharing the removed jack 20 with another jack-up device 21, the required number of jacks 20 can be significantly reduced. The lifting bolt 1 for the reaction force plate 14
Since the lift amount of 7 is the jack-up amount, the jack-up amount can be easily grasped by marking the bolt 17 with a scale for grasping the level. Next, mortar is grout-injected into the hollow portion 22 formed by jacking up, and the uppermost block plate 2 is fixed in a corrected recovery state. The components of the jack-up device 21, such as the reaction force bolt 12 and the lifting bolt 17, are disassembled and removed.
Is again covered by the lid 11.

[0010]

Since the jack-up device of the present invention has the above-described configuration, the following various effects can be expected. (1) The structure of the jack-up device is simple, the initial cost can be reduced, and rapid correction and recovery can be performed when uneven settlement occurs. (2) Equipped with two upper and lower reaction force plates for jack reception and temporary reception, the jack can be removed and moved to another point by temporarily receiving the lower reaction plate. Reduce the number of jacks and contribute to streamlining of construction work. (3) At the time of jack-up construction, the amount of jack-up can be easily grasped by marking a level grasp scale on the lifting bolt.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a three-story concrete slab of the present invention.

FIG. 2 is a longitudinal sectional view of the buried lifting connector of the present invention.

FIG. 3 is a transverse sectional view taken along line AA of FIG. 2;

FIG. 4 is a longitudinal sectional view showing a state in which a jack-up device is set.

FIG. 5 is a longitudinal sectional view showing a jack-up state.

FIG. 6 is a longitudinal sectional view showing a state where the jack is temporarily removed and the jack is removed.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Slab concrete floor 2 Top block block 2a Single block block 3 Middle layer reinforced concrete 4 Improved ground 5 Peeling sheet 6 Main pillar 7 Pipe 8a Top end plate 8b Load receiving plate 9 Lifting connection tool 10 Reaction force receiving plate 11 Lid Reference Signs List 12 reaction force bolt 13 jack receiving reaction plate 14 temporary receiving reaction plate 15 upper receiving nut 16 lower receiving nut 17 lifting bolt 18 upper holding nut 19 lower holding nut 20 jack 20a top of jack 20b jack Lower part 21 jack-up device 22 cavity E soft ground

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Takeshi Matsuura 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (56) References JP-A-4-49379 (JP, A) (58) Field surveyed (Int.Cl. ⁷ , DB name) E04G 23/06

Claims (3)

(57) [Claims] The concrete floor on the soft ground has a three-layer structure comprising a reinforced concrete block slab on the uppermost layer, a reinforced concrete mat slab on the middle layer, and an improved ground on the lowermost layer by a cement safe processing method or the like. A release sheet is interposed between the uppermost layer and the middle layer, and the block plate of the uppermost layer is located at the apex position of the Y-shape on the periphery of the main column having the screw holes for the suspension bolts as the center.
A standing pipe is erected, and a lifting connector having upper and lower ends fixed by a top plate and a load receiving plate is buried integrally with the pipe, and is brought into contact with the load receiving plate to form a middle layer mat slab. A reaction force receiving plate is laid on the top, the top of the top plate is always covered with a lid, and if uneven settlement occurs, the lid is removed and the three pipes are attached. The reaction force bolts are inserted so as to stand upright on the reaction force receiving plate, and two upper and lower receiving nuts are screwed onto the three reaction force bolts to support the upper and lower two reaction force plates. A lifting bolt is inserted through the center hole of the two reaction force plates, and the lower ends thereof are screwed into the support screw holes,
Two upper and lower presser nuts are screwed on the upper part, a jack placed between the upper presser nut and the upper reaction plate is tightened from above, and a lower presser nut is a lower receiving nut. A concrete structure characterized in that the lower reaction plate is fastened between the upper plate and the uppermost block plate can be jacked up on the upper reaction plate via the upper holding nut by the operation of the jack. Jack-up device for plate level correction method. 2. When the uppermost block plate is jacked up by the operation of the jack, the gap generated in the lower holding nut is retightened, and the lower reaction plate is retightened.
2. The jack-up device for a concrete slab level correction method according to claim 1, wherein the jack-up block slab can be temporarily received on a lower reaction plate via a lower holding nut. 3. A three-dimensional measurement of a floor level of a concrete concrete floor in which uneven settlement has occurred, and a minimum jack-up construction block necessary for correction of uneven settlement is determined from a block of the uppermost layer. 3. The jack-up device for a concrete slab level correction method according to claim 1, wherein the jack-up device is capable of jacking up.