CN102864795A - Light steel factory post foundation suitable for sedimentation of filled-in ground and construction method - Google Patents

Abstract

The invention discloses a light steel factory building column foundation and a construction method adapted to the settlement of the filling foundation. The column foundation includes connecting steel bars, a column bottom plate, a steel backing plate, a prefabricated pad and an independent column under the column arranged in sequence from top to bottom. As a foundation, the connecting reinforcement includes a top screw reinforcement, a middle screw reinforcement and a bottom anchor screw reinforcement. When the filling foundation settles, the top screw reinforcement and the middle screw reinforcement can be disassembled, and the column bottom plate can be lifted back to the original design level through the steel backing plate with a jack, and the column bottom plate and the independent foundation under the column can be filled with prefabricated pads gap between. The invention has reasonable structure, convenient construction, safety and reliability, can adjust the height of the column bottom at any time according to the needs, can effectively solve the adverse effects of foundation settlement on the construction of the existing light steel workshop column foundation and the normal use of the structure, and has great advantages in engineering construction. Good economic benefit and time benefit.

Description

A light steel workshop column foundation and its construction method adapted to the settlement of the fill foundation

technical field

The invention relates to a foundation structure of a light steel factory building column, in particular to a light steel factory building column foundation adapted to the settlement of the filling foundation and a construction method for raising it after settlement.

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Background technique

In the construction of new industrial areas in mountainous towns with undulating terrain, large excavations and large fillings are often required when leveling the site, and limited by the project cost and construction period requirements, it is often difficult to achieve compaction and compaction. If the steel structure factory building does not meet the compaction quality requirements If the filling area is constructed before the settlement of the filling foundation is not stabilized, the settlement will directly lead to the corresponding settlement of the foundation, thereby generating harmful secondary stress in the superstructure, and causing deformation, cracking or cracking of the superstructure and the building. Therefore, it is often necessary to carry out foundation treatment for the fill foundation or use relatively expensive pile foundations to transfer the load to the stable stratum under the fill layer, which requires a lot of effort. much economic cost. If you wait for the settlement of the uncompacted fill foundation to stabilize before proceeding with the construction of the steel structure factory building, the time required to wait for the fill to consolidate is generally at least about 5 years from the beginning of the fill, such as waiting for the new fill to consolidate Building after completion is more expensive in terms of time.

Therefore, it is necessary to modify the design and construction plan of the existing light steel factory building column foundation on the filled foundation, so that it can ensure that the settlement of the filled foundation does not cause the elevation of the bottom of the column to decrease, and it can be connected with the upper structural column after the height is increased. Reliable connection is made to ensure the reliable transfer of load from top to bottom and the safety of the superstructure, thereby avoiding relatively expensive foundation treatment and construction schemes of pile foundation or strip foundation or even waiting for the filling to be consolidated before construction. for costly time loss.

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Contents of the invention

Aiming at the above-mentioned deficiencies in the prior art, the present invention solves the problem that the column base of the light steel factory building on the existing filling foundation will cause the elevation of the bottom of the column to decrease with the settlement of the filling foundation, resulting in deformation, cracking or cracking of the upper structure and buildings of the light steel factory building. Instability will seriously affect the safety of the building structure, as well as the high maintenance cost caused by the construction of the existing technology, and a light steel factory building column foundation suitable for the settlement of the fill foundation is provided.

Another object of the present invention is to provide a construction method for using the light-steel workshop column foundation that is adapted to the settlement of the fill foundation and then raising it after settlement.

To solve the above problems, the technical solution adopted by the present invention is: a light steel workshop column foundation adapted to the settlement of the filled foundation, which is characterized in that it includes connecting steel bars and column bottom plates, steel backing plates, prefabricated The pad and the independent foundation under the column, the connecting reinforcement includes the top screw reinforcement and the bottom anchor screw reinforcement, and the top screw reinforcement and the bottom anchor screw reinforcement are detachably connected through the connecting sleeve; the column bottom plate is used to fix the light I-beam steel column of steel workshop;

The column bottom plate, the steel backing plate and the prefabricated spacer are provided with a plurality of via holes passing through the column bottom plate, the steel backing plate and the prefabricated spacer, and the column bottom plate, the steel backing plate, and the prefabricated spacer are connected by connecting steel bars through the through holes. The block is connected with the independent foundation under the column as a whole; the upper end of the top screw steel bar is fixed with the column bottom plate through a double nut and a nut backing plate, and the lower end of the top screw bar is connected with the upper end of the bottom anchor screw bar through a connecting sleeve; The lower end of the anchor bolt steel bar is anchored and connected with the concrete foundation;

The steel backing plate has overhanging parts above the opposite sides of the prefabricated spacer.

Further, the prefabricated block is a steel plate, a cement mortar block or a concrete block.

Further, there are 4 groups of via holes.

Further, the bottom of the bottom anchor screw reinforcement has a bent part.

Further, there are multiple prefabricated pads, and the connecting steel bars include top screw bars, middle screw bars, and bottom anchor screw bars, and the top screw bars, middle screw bars and bottom anchor bar bars pass through the connecting sleeve threaded connection.

A construction method for raising the foundation of the above-mentioned light steel factory building column after settlement, comprising the following steps:

1) When the filling settlement occurs, first remove the double nuts and the nut backing plate at the upper end of the top screw reinforcement, and take out the top screw reinforcement;

2) By applying force to the protruding part of the steel backing plate on the opposite sides of the prefabricated cushion block, the column bottom plate is raised to the original design elevation of the column bottom before the foundation settlement;

3) Between the steel backing plate and the independent foundation under the column, fill in prefabricated spacers with holes in appropriate quantity, thickness and strength;

4) The force is removed, and the column bottom plate is raised to the original column bottom design elevation by the prefabricated spacer;

5) Use the top screw reinforcement with a suitable length to pass through the column bottom plate, steel backing plate, and prefabricated spacer, and then tighten it with the bottom anchor bolt screw reinforcement through the connecting sleeve; finally insert a nut at the end of the top screw reinforcement The backing plate is fastened to the bottom plate of the column through double nuts, thereby completing the process of adjusting the height of the backing after the settlement of the filling foundation occurs.

Further, when a force is applied to the overhanging parts of the steel backing plate on opposite sides of the prefabricated pad, the jack is placed below the overhanging position of the steel backing plate, and the steel backing plate is directly lifted by the jack.

A construction method for raising the foundation of the above-mentioned light steel factory building column after settlement, comprising the following steps:

1) When the filling settlement occurs, first remove the double nuts and the nut backing plate on the upper end of the top screw reinforcement, and take out the top screw reinforcement;

2) By applying force to the protruding part of the steel backing plate on the opposite sides of the prefabricated cushion block, the column bottom plate is raised to the original design elevation of the column bottom before the foundation settlement;

3) Then connect the middle screw bar with threaded ends with proper length adjustment to the lower anchor screw bar through the connecting sleeve, and fasten the connecting sleeve between it and the top bolt bar bar above the middle screw bar ;Put prefabricated spacers with through holes in appropriate quantity, thickness and strength from the top of these connected steel bars;

4) The force is removed, and the column bottom plate is raised to the original column bottom design elevation by the prefabricated spacer;

5) Put the top screw reinforcement through the column bottom plate and the steel backing plate, and then tighten it with the middle screw reinforcement thread through the connecting sleeve; finally put the nut backing plate at the end of the top screw reinforcement and fasten it to the column bottom plate through double nuts , thus completing the process of pad height adjustment after the settlement of the fill foundation occurs.

Further, a quadrilateral frame is made, and when a force is applied to the overhanging parts of the steel backing plate on opposite sides of the prefabricated pad, the two frames are inserted into the overhanging parts on both sides of the steel backing plate respectively, and then two steel rods are used to pass through the overhanging parts of the steel backing plate. The two corners of the top sides of the two frames, and set jacks on the ground to lift the steel rods, so as to lift the frames, and then lift the steel backing plate and the column bottom plate.

Compared with the prior art, the present invention has the following beneficial effects:

1. The structure of the present invention is reasonable, the construction is convenient, and the height of the column bottom can be adjusted at any time according to the needs.

2. By adopting the method of the present invention, engineering construction can be carried out at any time when the filling is not yet consolidated. At the same time, there is no need to use expensive pile foundations, strip foundations or foundation treatment under the light steel factory building columns, only need to use Conventional shallow foundations are enough to achieve economical savings, safety and reliability, and easy and quick construction.

3. When the filling foundation and the foundation under the column settle, because the upper structure of the light steel factory building is relatively light, jacks can be used to lift the factory building column through this structure, and prefabricated pads are used to lift the steel backing plate produced after the jacking Fill the gap with the independent foundation under the column, and replace the top screw reinforcement with a suitable length or increase the middle screw reinforcement, and reconnect the bottom plate of the column and the steel backing plate under it, the prefabricated spacer and the independent foundation under the column through connecting reinforcement In this way, with the settlement of the filling, the bottom of the column can be raised to the original elevation at any time until the settlement of the filling is stable after many years, thereby avoiding the impact of the settlement of the filling foundation on the elevation of the column bottom and the light steel Adverse effects caused by the superstructure of the plant.

4. The invention can effectively solve various difficulties caused by foundation settlement in the foundation construction of light-steel factory buildings on conventional fill foundations, has good economic and time benefits, and is easy to construct, safe and reliable.

5. The invention has a wide range of applications, not only for filling soil foundations, but also for engineering conditions such as deformation, cracking or instability of the upper light steel workshop structure caused by uneven settlement of foundations in soft soil foundations and various situations.

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Description of drawings

Fig. 1 is the structural representation of foundation of the present invention;

Fig. 2 is a schematic structural view of the raised foundation of the present invention.

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Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Embodiment 1: As shown in Figure 1, a light steel factory building column foundation adapted to the settlement of the fill foundation, including a column bottom plate 1, a steel backing plate 2 , a prefabricated pad 3 , and an independent foundation under the column arranged in sequence from top to bottom 4 (the independent foundation 4 under the column is generally made of concrete or reinforced concrete material) and connecting steel bars, the connecting steel bars include top screw steel bar 5 and bottom anchor bolt screw steel bar 6, and the top screw bar steel bar 5 and bottom anchor bolt The screw reinforcement 6 is detachably connected through the connecting sleeve 7, and is connected with a mechanical sleeve during specific implementation, which is more stable; the I-steel column 8 of the light steel factory building is fixedly connected with the column bottom plate 1. Described prefabricated spacer 3 is steel plate, cement mortar spacer or concrete spacer, makes the intensity of prefabricated spacer 3 can meet the structural force requirement, the material of this prefabricated spacer 3, thickness are selected according to actual situation (generally less than 2cm Steel plates or steel sheets are used, cement mortar pads are used for 2-6cm, and fine stone concrete pads are used for more than 6cm). During specific construction, steel wire mesh or steel mesh can be arranged inside the cement mortar block or concrete block according to the stress situation, so that the prefabricated block has better integrity and stronger bearing capacity.

The column bottom plate 1, the steel backing plate 2 and the prefabricated cushion block 3 are provided with a plurality of via holes passing through the column bottom plate 1, the steel backing plate 2 and the prefabricated spacer block 3, and the column bottom plate 1 is connected by connecting steel bars through the through holes. , steel backing plate 2, prefabricated spacer 3 and the independent foundation 4 under the column are connected as a whole; the through holes are generally 4 groups (increase or decrease depending on the size of the column bottom plate 1 and the load borne by the steel column), and can also be 6 groups, 8 groups, etc., are selected according to the specific situation; they are distributed in the reasonable force-bearing parts of the column bottom plate 1, steel backing plate 2 and prefabricated cushion block 3, and the effect is better.

The upper end of the top screw reinforcing bar 5 is fixed with the column bottom plate 1 by double nuts and nut backing plate, the lower end of the top screw reinforcing bar 5 and the upper end of the bottom anchor screw reinforcing bar 6 are threadedly connected by the connecting sleeve 7; the bottom anchor screw reinforcing bar 6 The lower end of the lower end is anchored and connected with the independent foundation 4 under the column; the bottom of the bottom anchor bolt steel bar 6 has a bent part, which can effectively improve the anchoring effect. The steel backing plate 2 has overhanging parts above the opposite sides of the prefabricated cushion block 3 .

The steel backing plate 2 can also be replaced by a steel backing bar that avoids connecting steel bars, which saves more materials while ensuring strength and stability. The thickness of the steel backing plate 2 or the steel backing bar needs to meet the stress requirements, and its thickness is generally not less than 20mm.

In the case that the foundation settlement is not large, it is only necessary to replace the top screw steel bar with a suitable length and then threadedly connect the bottom anchor screw steel bar 6 through the connecting sleeve 7 again. After the ground subsidence occurs, the column floor 1 of the I-beam steel column 8 of the light steel factory building is first lifted through the steel backing plate 2, and then the prefabricated spacer with holes is used to fill the resulting independent foundation 4 and column under the column. The gap between the bottom plates 1, so that the column bottom plate 1 returns to its original position.

The construction method of using the light steel workshop column foundation adapted to the settlement of the fill foundation and raising it after settlement includes the following steps:

1) When the filling settlement occurs, first remove the double nuts and the nut backing plate at the upper end of the top screw reinforcement, and take out the top screw reinforcement; at the same time, excavate the foundation pit to make the top of the independent foundation under the column and the overhanging part of the steel backing plate above exposed;

2) By applying force to the protruding part of the steel backing plate on the opposite sides of the prefabricated spacer, the column bottom plate is raised to the original design elevation of the column bottom before foundation settlement; the steel backing plate on the opposite sides of the prefabricated spacer is When applying force to the overhanging part of the steel backing plate, place the jack under the overhanging position of the steel backing plate, and directly lift the steel backing plate through the jack, which is easy to operate and is suitable for smaller jacks or lighter weight workshops.

3) Between the steel backing plate and the independent foundation under the column, prefabricated pads with through holes in appropriate quantity, thickness and strength are filled; the number and thickness of the prefabricated pads can raise the bottom plate of the column to the height before settlement The strength of the prefabricated pads shall be subject to the requirements of the force, and shall not be lower than the concrete strength of the independent foundation 4 under the column. Before filling, it shall be prefabricated according to the number and thickness of the required blocks; when filling, insert the steel backing plate 2 and the column between lower independent foundations 4;

4) The force is removed, and the column bottom plate is raised to the original column bottom design elevation by the prefabricated spacer;

5) Use the top screw reinforcement with a suitable length to pass through the column bottom plate, steel backing plate, and prefabricated spacer, and then tighten it with the bottom anchor bolt screw reinforcement through the connecting sleeve (you can replace another top screw reinforcement); finally A nut backing plate is placed at the end of the top screw reinforcement and fastened to the bottom plate of the column through double nuts, thereby completing the process of pad height adjustment after the settlement of the filling foundation occurs. Double nuts are used to fasten the column bottom plate, which can further ensure the stability of the overall structure and prevent the nuts from falling off.

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Embodiment 2, as shown in Figure 2, there are multiple prefabricated pads, the connecting reinforcements include top screw reinforcements, middle screw reinforcements 9, bottom anchor screw reinforcements, the top screw reinforcements, middle screw reinforcements 9 and Bottom anchor bolts are threaded through connecting sleeves, and mechanical sleeves are used for specific implementation, which is more stable.

In the case of large foundation settlement, add or replace the middle screw reinforcement with appropriate length according to the needs, so that when filling the prefabricated pad (pad), the middle screw reinforcement can be connected while filling the prefabricated pad (pad) ,More convenient. After the ground subsidence occurs, the column bottom plate of the I-steel column of the light steel factory building is lifted first, and then the hole prefabricated concrete pad (or pad) is used to fill the resulting independent foundation under the column and the column bottom plate. The gap between them, so that the column bottom plate returns to its original position.

For the above-mentioned light-steel factory house-column foundation adapted to the settlement of the fill foundation, the construction method for raising it after settlement includes the following steps:

1) When the filling settlement occurs, first remove the double nuts and the nut backing plate at the upper end of the top screw reinforcement, and take out the top screw reinforcement; at the same time, excavate the foundation pit to make the top of the independent foundation under the column and the steel backing plate above it The protruding part is exposed;

2) By applying force to the protruding part of the steel backing plate on the opposite sides of the prefabricated cushion block, the column bottom plate is raised to the original design elevation of the column bottom before the foundation settlement; When applying force to the overhanging parts of the steel backing plate on both sides, the two frames are inserted into the overhanging parts on both sides of the steel backing plate respectively, and then two steel rods are used to pass through the two corners of the top sides of the two frames and place on the ground. A jack is set on the top to lift the steel rod, thereby lifting the frame, and then lifting the steel backing plate and the bottom plate of the column. During specific construction, the quadrilateral frame can be made into a trapezoidal shape and adopts a steel structure, which not only facilitates construction, but also has a stronger bearing capacity. The quadrangular steel frame can be made of conventional steel materials such as hot-rolled steel bars or section steel according to the load of the light steel factory building column, that is, the required jacking force. In this way, the lifting process will not be affected by the light steel workshop, the operation is more convenient, and the effect is better, so that the force on the steel backing plate is more balanced and easier to operate.

3) Then connect the middle screw bar with threaded ends with proper length adjustment to the lower anchor screw bar through the connecting sleeve, and fasten the connecting sleeve between it and the top bolt bar bar above the middle screw bar ;Put prefabricated spacers with through holes in appropriate quantity, thickness and strength from the top of these connected steel bars;

4) The force is removed, and the column bottom plate is raised to the original column bottom design elevation by the prefabricated spacer;

5) Put the top screw reinforcement through the column bottom plate and the steel backing plate, and then tighten it with the middle screw reinforcement thread through the connecting sleeve; finally put the nut backing plate at the end of the top screw reinforcement and fasten it to the column bottom plate through double nuts , thus completing the process of pad height adjustment after the settlement of the fill foundation occurs. Double nuts are used to fasten the column bottom plate, which can further ensure the stability of the overall structure and prevent the nuts from falling off.

In addition to being suitable for filling soil foundations, the present invention can also be extended to light steel workshop buildings that may cause foundation subsidence in other occasions, such as soft soil foundations, other bad foundations, and the like.

In addition, the prefabricated pads are made in the form of the upper part being horizontal and the lower part being inclined. The top surface of the foundation may be slightly inclined during the settlement of the fill, which can ensure that the bottom of the upper column remains in the original horizontal state. Generally, the degree of inclination is not very large.

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Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than limit the technical solutions. Although the applicant has described the present invention in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that those who understand the present invention Any modification or equivalent replacement of the technical solution of the invention without departing from the spirit and scope of the technical solution shall be covered by the scope of the claims of the present invention.

Claims (9)

1. A light steel factory building column foundation adapted to the settlement of the fill foundation, characterized in that it comprises connecting steel bars and a column bottom plate, a steel backing plate, a prefabricated spacer and an independent foundation under the column arranged successively from top to bottom, and the connection The reinforcing bars include top screw reinforcing bars and bottom anchor screw reinforcing bars, the top screw reinforcing bars and the bottom anchor screw reinforcing bars are detachably connected through connecting sleeves; the column bottom plate is used to fix the I-shaped steel columns of the light steel factory building; The column bottom plate, the steel backing plate and the prefabricated spacer are provided with a plurality of via holes passing through the column bottom plate, the steel backing plate and the prefabricated spacer, and the column bottom plate, the steel backing plate, and the prefabricated spacer are connected by connecting steel bars through the through holes. The block is connected with the independent foundation under the column as a whole; the upper end of the top screw steel bar is fixed with the column bottom plate through a double nut and a nut backing plate, and the lower end of the top screw bar is connected with the upper end of the bottom anchor screw bar through a connecting sleeve; The lower end of the anchor bolt steel bar is anchored and connected with the concrete foundation; The steel backing plate has overhanging parts above the opposite sides of the prefabricated spacer. 2. The light steel factory building column foundation adapted to the settlement of the fill foundation according to claim 1, wherein the prefabricated spacer is a steel plate, a cement mortar spacer or a concrete spacer. 3. The light steel factory building column foundation adapted to the settlement of the fill foundation according to claim 1, characterized in that there are 4 groups of said through holes. 4. The light steel factory building column foundation adaptable to the settlement of the fill foundation according to claim 1, characterized in that, the bottom of the bottom anchor bolt and screw reinforcement has a bent part. 5. According to any one of claims 1 to 4, the light steel workshop column foundation adapted to the settlement of the fill foundation, is characterized in that there are multiple prefabricated pads, and the connecting reinforcement includes top screw reinforcement, middle screw reinforcement, bottom Anchor screw reinforcement, the top screw reinforcement, the middle screw reinforcement and the bottom anchor screw reinforcement are threaded through the connecting sleeve. 6. as claimed in claim 1, the construction method for padding after the settlement of the light steel workshop column foundation adapted to the settlement of the fill foundation, is characterized in that, comprises the steps: 1) When the filling settlement occurs, first remove the double nuts and the nut backing plate at the upper end of the top screw reinforcement, and take out the top screw reinforcement; 2) By applying force to the protruding part of the steel backing plate on the opposite sides of the prefabricated cushion block, the column bottom plate is raised to the original design elevation of the column bottom before the foundation settlement; 3) Between the steel backing plate and the independent foundation under the column, fill in prefabricated spacers with holes in appropriate quantity, thickness and strength; 4) The force is removed, and the column bottom plate is raised to the original column bottom design elevation by the prefabricated spacer; 5) Use the top screw reinforcement with a suitable length to pass through the column bottom plate, steel backing plate, and prefabricated spacer, and then tighten it with the bottom anchor bolt screw reinforcement through the connecting sleeve; finally insert a nut at the end of the top screw reinforcement The backing plate is fastened to the bottom plate of the column through double nuts, thereby completing the process of adjusting the height of the backing after the settlement of the filling foundation occurs. 7. The construction method according to claim 6, characterized in that, when applying force to the overhanging parts of the steel backing plate above the opposite sides of the prefabricated pad, the jack is placed under the overhanging position of the steel backing plate, and the jack directly Lift the steel backing plate. 8. as claimed in claim 5, the construction method for padding after the settlement of the light steel workshop column foundation adapted to the settlement of the fill foundation, is characterized in that, comprises the steps: 1) When the filling settlement occurs, first remove the double nuts and the nut backing plate on the upper end of the top screw reinforcement, and take out the top screw reinforcement; 2) By applying force to the protruding part of the steel backing plate on the opposite sides of the prefabricated cushion block, the column bottom plate is raised to the original design elevation of the column bottom before the foundation settlement; 3) Then connect the middle screw bar with threaded ends with proper length adjustment to the lower anchor screw bar through the connecting sleeve, and fasten the connecting sleeve between it and the top bolt bar bar above the middle screw bar ;Put prefabricated spacers with through holes in appropriate quantity, thickness and strength from the top of these connected steel bars; 4) The force is removed, and the column bottom plate is raised to the original column bottom design elevation by the prefabricated spacer; 5) Put the top screw reinforcement through the column bottom plate and the steel backing plate, and then tighten it with the middle screw reinforcement thread through the connecting sleeve; finally put the nut backing plate at the end of the top screw reinforcement and fasten it to the column bottom plate through double nuts , thus completing the process of pad height adjustment after the settlement of the fill foundation occurs. 9. The construction method according to claim 6 or 8, characterized in that a quadrilateral frame is made, and when a force is applied to the overhanging parts of the steel backing plate on the opposite sides of the prefabricated spacer, the steel backing is inserted through the two frames respectively The protruding parts on both sides of the board, and then use two steel rods to pass through the two corners of the top sides of the two frames, and set a jack on the ground to lift the steel rods, so as to lift the frame, and then the steel backing plate and column The bottom plate is jacked up.

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