CN110273339A - A kind of land subsidence crack resistence structure and its construction method - Google Patents

Abstract

The first object of the present invention is to disclose a ground subsidence anti-cracking structure and its construction method, which belong to the field of building construction. The key points of the technical solution are S1: tamping the base ground; S2: inserting ground beams on the tamped base ground, And re-compact the ground of the base; S3: insert vertical steel bars inside the ground beams, and pour retaining walls on the ground beams; S4: lay a filler layer on the base ground; S5: pour concrete above the filler layer As for the slab, there are structural joints between the concrete slabs, and the structural joints and the ground beams are in the same vertical plane; S6: A backfill soil layer is laid above the concrete slab, and the backfill soil layer is compacted; S7: Pour a layer of concrete consolidation layer above the backfill soil layer; achieve the effect of avoiding large-area cracking on the ground. The second object of the present invention is to provide a ground subsidence and anti-cracking structure to prevent large-area cracking on the ground. .

Description

Ground sinking anti-cracking structure and construction method thereof

technical field

The invention relates to the field of building construction, in particular to a ground subsidence anti-cracking structure and a construction method thereof.

Background technique

In recent years, with the continuous development of my country's economy and the development of urban construction, especially in some coastal cities, the land demand continues to expand. For the main structure of buildings in coastal areas, pile foundations are generally used, and it is better to transfer the load of the main structure to the lower part through columns. In the soil bearing layer, ensure that the settlement of the main body and the mechanism meets the requirements of the code.

In some existing constructions, in order to save costs, a 100mm concrete surface layer is directly made after the plain soil is rammed. However, in this method, the soil below the concrete surface layer has not yet consolidated. After many years of use of public buildings or houses, the underlying ground The amount of settlement is large, but the settlement at the caps around the columns is small, resulting in large-scale cracking and uneven settlement on the ground at the junction of the caps around the columns, which not only affects the aesthetic performance of the ground, but also affects Safe use of public facilities or premises.

Contents of the invention

In view of the deficiencies in the prior art, the first object of the present invention is to provide a ground subsidence anti-cracking construction method to achieve the effect of avoiding large-scale cracking on the ground; the second object of the present invention is to provide a ground subsidence anti-cracking method. Cracking structure to prevent large-scale cracking on the ground.

Above-mentioned technical purpose of the present invention is achieved through the following technical solutions:

A ground subsidence anti-cracking construction method, comprising the following steps:

S1: Compact the ground at the base level;

S2: insert ground beams on the tamped base ground, and re-compact the base ground;

S3: A vertical steel bar is inserted inside the ground beam with a diameter of 8mm, and a retaining wall is poured on the ground beam;

S4: Lay a filler layer on the base floor and compact the filler layer; the thickness of the filler layer is 450mm-550mm, the filler layer is composed of gravel and cohesive soil, the dry density of the filler layer is ≥2.1t/m, and the gravel particles Diameter≤50mm;

S5: Concrete slab is poured above the filler layer. The thickness of the concrete slab is 120mm. At the same time, a number of reinforcement bars are embedded in the concrete slab. The diameter of the reinforcement bars is 8mm, and the distance between adjacent reinforcement bars is 200mm. When pouring concrete slabs, there are structural joints between the concrete slabs, and the structural joints and ground beams are in the same vertical plane;

S6: A backfill soil layer is laid above the concrete slab layer, and the backfill soil layer is compacted;

S7: Pour a layer of concrete consolidation layer above the backfill soil layer.

By adopting the above-mentioned technical scheme, the ground of the base is tamped, so that the ground of the base becomes a strong bearing layer, and then the ground beams are buried in the ground of the base, and the vertical steel bars inserted into the ground beams can not only strengthen the ground beams and retaining walls At the same time, it also helps to weaken the external force applied to the retaining wall, thereby reducing the impact of external force on the ground beam. However, the gravel and cohesive soil laid on the base layer can improve the bearing capacity of the base layer, and the cohesive soil has good water stability, high strength and strong capillary action after compaction, so that the stiffness of the filling layer is consistent, so that the ground can evenly settle , to prevent large areas of cracking on the ground. When the particle size of the crushed stone is ≤50mm, the density of the filler layer is increased, which is helpful for the uniform settlement of the ground, and effectively prevents that when the particle size of the crushed stone is too large, the porosity of the filler layer is too large, which will lead to uneven force on the ground, which will cause Affects the uniform settlement of the ground.

When the thickness of the concrete slab is 120mm, it can effectively improve the bearing capacity of the backfill soil layer and effectively increase the service life of the backfill soil layer. Weaken part of the ground load so that the ground can settle evenly. When the structural joints are set under the backfill soil layer, the bearing capacity of the backfill soil layer can be guaranteed, and at the same time, the load of the backfill soil layer can be prevented from being transmitted to the ground beam, which will affect the stability of the ground beam and the connection strength between the ground beam and the base ground. , to avoid large areas of subsidence cracks on the ground.

In the present invention, it is further set that in S4, the ratio of gravel to cohesive soil is 3:7.

By adopting the above technical scheme, when the ratio of gravel and cohesive soil is 3:7, the packing layer has a certain firmness, and at the same time, the packing layer also has a certain water permeability, so that the water infiltrated into the packing layer can be evenly diffused, Therefore, the softness and hardness of the filler layer are consistent, so that the filler layer can settle evenly, and effectively avoid large-area cracks on the ground.

In the present invention, it is further set that, in S4, the filler layer is compacted in layers, the thickness of the layers is 250 mm, and the compaction coefficient is not less than 0.95.

By adopting the above technical scheme, the layered compaction of the filler layer can effectively improve the bearing capacity of the filler layer, so that the filler layer can settle evenly. When the thickness of the layered compaction of the filler layer is too high, the filler layer at the bottom cannot be compacted tightly. When the thickness of the layered compaction is too low, the construction cost will be increased. Therefore, when the thickness of the layered compaction is 250mm, it can not only ensure that the packing layer is compacted, but also save the construction cost.

The present invention is further provided that, in S4, an elastic layer with a thickness of 15 mm is laid on the filler layer, and the elastic layer is composed of epoxy resin and rubber powder.

By adopting the above technical scheme, the setting of the elastic layer can effectively weaken the load passing through the concrete slab, thereby reducing the load transmitted to the inside of the filler layer, and the settlement of the filler layer is also greatly reduced, preventing uneven settlement, and the ring Oxygen resin and rubber powder have certain elasticity and impact resistance, which can effectively weaken the load under the concrete slab, so that the entire ground can evenly settle and prevent large-scale cracks.

In the present invention, it is further set that, in S5, the width of the structural seam is 30 mm.

By adopting the above technical scheme, when the width of the structural joint is 30mm, it can effectively block the load on the ground from being transmitted to the ground beam, and it is also convenient for the workers to construct.

The present invention is further provided that, in the vertical direction, the retaining wall is arranged on one side of the structural joint.

By adopting the above technical scheme, after the retaining wall is arranged on one side of the structural joint, the structural joint can block the transmission of the horizontal force of the concrete slab to the retaining wall, reduce the impact force on the retaining wall in the horizontal direction, and prevent the The cracks between the earth wall and the ground beam will affect the stability of the backfill soil layer, and effectively avoid large-scale cracks.

The present invention is further provided that a graded sandstone layer is laid between the backfill soil layer and the concrete consolidation layer.

By adopting the above technical scheme, the graded sand and gravel layer between the backfilling soil layer and the concrete consolidation layer can further improve the bearing capacity of the concrete consolidation layer. The density makes the concrete slab evenly stressed and prevents the concrete slab from breaking due to uneven force.

The present invention is further provided that a horizontal reinforcing plate is connected between adjacent retaining walls, and a vertical connecting groove with a convex interface is reserved on the retaining wall, and the reinforcing plate is used in conjunction with the connecting groove.

By adopting the above-mentioned technical scheme, the reinforcing plate between the retaining walls can effectively prevent the joint between a single retaining wall and the ground beam from breaking. The reserved convex connection groove effectively prevents the retaining wall from being detached from the retaining wall under the action of horizontal extrusion force, improving the practicability of the reinforcing plate.

The present invention is further provided that the distance between adjacent reinforcement plates is 100 mm.

By adopting the above technical scheme, when the distance between adjacent reinforcement plates is 100mm, it can not only save material and construction costs, but also help to weaken the load inside the packing layer, effectively avoiding large-area cracks on the ground.

The second object of the present invention is to provide a ground subsidence and anti-cracking structure, which includes base ground, filler layer, elastic layer, concrete slab layer, backfill soil layer, sand and gravel layer and concrete consolidation layer from bottom to top. There is a ground beam between the ground beam and the filling layer. One end of the ground beam is inserted into the ground of the base layer, and the other end is inserted into the filling layer. Vertical steel bars are inserted on the ground beam, and a retaining wall is poured on the ground beam. On the retaining wall A connecting groove is left, and a reinforcing plate used in conjunction with it is arranged in the connecting groove, and structural joints are opened in the concrete slab.

In summary, the present invention has the following beneficial effects:

1. The combined use of ground beams, retaining walls and structural joints not only plays a certain role in supporting the concrete consolidation layer, but also makes the concrete consolidation layer stronger. At the same time, when the load of the concrete consolidation layer is transmitted downward, The retaining wall and structural joints can effectively weaken the load and reduce the bearing capacity of the ground beam, so that the entire ground can settle evenly and prevent large-scale cracking on the ground;

2. The combined use of the elastic layer and the sand and gravel layer can not only further weaken the load transmitted downwards, but also provide further support for the concrete consolidation layer, making the concrete consolidation layer stronger, and effectively avoiding large damage on the ground. Area cracking;

3. The combined use of connecting grooves and reinforcement plates prevents cracks at the joints between the retaining wall and the ground beams, resulting in dislocation between the retaining wall and the ground beams, ensuring the supporting effect of the retaining wall on the concrete consolidation layer, and at the same time Weaken the load.

Description of drawings

Fig. 1 is the sectional structure schematic diagram of the present invention;

Fig. 2 is a schematic diagram of part of the structure intended to show the connection grooves and reinforcement plates on the retaining wall.

In the figure, 1. Base ground; 2. Ground beam; 21. Retaining wall; 211. Connection groove; 22. Vertical reinforcement; 3. Filling layer; 4. Concrete slab; 41. Reinforcement reinforcement; 42. Structural joint ; 5. Backfill soil layer; 6. Concrete consolidation layer; 7. Elastic layer; 8. Sand and gravel layer; 9. Reinforcement board.

Detailed ways

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

Example 1

A ground subsidence anti-cracking structure, comprising a base floor 1, a vertical ground beam 2 is inserted inside the base floor 1, a filler layer 3 is laid on the base floor 1, and a concrete slab is poured above the filler layer 3 Layer 4, a backfill soil layer 5 is provided above the concrete slab layer 4, and a concrete consolidation layer 6 is poured above the backfill soil layer 5.

As shown in Figure 1, the bottom end of the ground beam 2 is inserted into the interior of the base ground 1, and the top end protrudes from the base ground 1, leaving a distance from the surface of the base ground 1, and a vertical steel bar 22 is inserted on the ground beam 2, The bottom end of the vertical reinforcement 22 is inserted into the inside of the ground beam 2, and its top passes through the filler layer 3 and the concrete slab layer 4 and is positioned under the backfill soil layer 5. A concrete retaining wall 21 is poured on the ground beam 2, and the vertical reinforcement 22 It is located in the retaining wall 21, and the height of the retaining wall 21 is the same as that of the vertical steel bars 22.

The setting of the retaining wall 21 and the vertical steel bar 22 further weakens the load on the ground beam 2. At the same time, the setting of the retaining wall 21 also plays a certain role in strengthening the concrete consolidation layer 6 to prevent the concrete consolidation layer 6 from appearing. A large area of cracks, while the vertical reinforcement 22 is inserted into the inside of the ground beam 2, makes the connection between the retaining wall 21 and the ground beam 2 more firm, preventing cracks between the retaining wall 21 and the ground beam 2.

As shown in Figure 2, a vertical connecting groove 211 is left on the retaining wall 21, the cross section of the connecting groove 211 is convex, the height of the connecting groove 211 is less than the height of the retaining wall 21, and the top of the connecting groove 211 It communicates with the top of the retaining wall 21. The connecting groove 211 is provided with a horizontal reinforcing plate 9 used in conjunction with it. One end of the reinforcing plate 9 is connected to one of the retaining walls 21 , and the other end is connected to the other adjacent retaining wall 21 .

The reinforcement plate 9 between the adjacent retaining walls 21 plays a certain role in limiting the adjacent retaining walls 21, preventing the retaining walls 21 from inclining under the action of external force and making the gap between the retaining walls 21 and the ground beams 2 At the same time, the effect of the reinforcing plate 9 also weakens the load inside the filler layer 3 to a certain extent, so that the force on the base layer 1 is uniform, thereby preventing large-area cracks in the concrete consolidation layer 6 .

Looking back at Fig. 1, an elastic layer 7 is laid between the filler layer 3 and the concrete slab layer 4, the thickness of the elastic layer 7 is 15mm, and the elastic layer 7 is composed of epoxy resin and rubber powder. A structural joint 42 with a width of 30mm is left on the concrete slab 4, and a plurality of reinforcement bars 41 are laid in the concrete slab 4, and the plurality of reinforcement bars 41 are evenly arranged in the concrete slab 4, and the structural joint 42 In the same vertical plane as the ground beam 2 , in the vertical direction, the structural joint 42 is located on one side of the retaining wall 21 and is close to the retaining wall 21 .

The setting of the elastic layer 7 further weakens the load transmitted to the concrete slab 4, ensures the stability of the base ground 1, and at the same time enables the base ground 1 to settle evenly, preventing large-area cracks in the concrete consolidation layer 6, while the structure The setting of the joint 42 can prevent the load of the concrete consolidation layer 6 from being directly transmitted to the ground beam 2, thereby improving the service life and bearing capacity of the ground beam 2.

Looking back at Fig. 1, a graded sandstone layer 8 is laid between the backfill soil layer 5 and the concrete consolidation layer 6, and the sandstone layer 8 is compacted.

The use process of this embodiment is as follows:

Dig grooves on the base ground 1, bury the bottom end of the ground beam 2 in the base ground 1, and compact the base ground 1, then insert the bottom end of the vertical steel bar 22 into the inside of the ground beam 2, and then place the bottom end of the ground beam 2 on the ground beam 2. Construct the retaining wall 21 on top, and at the same time, during the pouring process, leave a vertical connection groove 211 on the retaining wall 21, and then lay the filler layer 3 on the base ground 1. When the height of the filler layer 3 reaches the connection groove 211, then connect the two ends of the reinforcing plate 9 with the two adjacent retaining walls 21 respectively, then continue to lay the filler layer 3, after the filler layer 3 is compacted, lay on the top of the filler layer 3 The elastic layer 7 is to pour the concrete slab 4 above the elastic layer 7, and leave a structural joint 42 on the concrete slab 4, lay the backfill soil layer 5 on the concrete slab 4, and then lay the backfill soil layer 5 Sand and gravel layer 8, and compact the backfill soil layer 5 and sand and gravel layer 8, and then pour concrete consolidation layer 6 on top of the sand and gravel layer 8.

Example 2

A ground subsidence anti-cracking construction method, comprising the following steps:

S1: Base ground 1 treatment, compacting the base ground 1;

S2: A ground beam 2 is inserted on the tamped base ground 1, the bottom part of the ground beam 2 is located in the base ground 1, the top is located above the base ground 1, and there is a distance between the top layer of the base ground 1, Then carry out compaction again to base ground 1;

S3: A vertical steel bar 22 is inserted inside the ground beam 2, and the diameter of the vertical steel bar 22 is 8mm, and a retaining wall 21 is poured on the ground beam 2, and a vertical cross section is left on the retaining wall 21 during pouring. Convex connecting groove 211;

S4: Lay the filler layer 3 on the base ground 1, and carry out layered compaction on the filler layer 3, the layer thickness is 250mm, and the compaction coefficient is not less than 0.95; the thickness of the filler layer 3 is 450mm-550mm, and the preferred filler The thickness of layer 3 is 500mm, the filler layer 3 is composed of gravel and cohesive soil, the ratio of gravel and cohesive soil is 3:7, the dry density of filler layer 3 is ≥2.1t/m, and the particle size of gravel is ≤50mm;

S5: An elastic layer 7 with a thickness of 15 mm is laid on the filler layer 3, and the elastic layer 7 is composed of epoxy resin and rubber powder;

S6: Concrete slab 4 is poured above the elastic layer 7. The thickness of the concrete slab 4 is 120 mm. At the same time, a plurality of reinforcement bars 41 are embedded in the concrete slab 4. The diameter of the reinforcement bars 41 is 8 mm. Adjacent reinforcement bars The distance between 41 is 200 mm. When pouring the concrete slab 4, a structural joint 42 with a width of 30 mm is left between the 4 concrete slabs. The structural joint 42 and the ground beam 2 are in the same vertical plane. , the structural joint 42 is located on one side of the retaining wall 21;

S7: A backfill soil layer 5 is laid above the concrete slab layer 4, and the backfill soil layer 5 is compacted;

S8: laying a graded sandstone layer 8 above the backfill soil layer 5, and compacting the graded sandstone layer 8;

S9: Pour a layer of concrete consolidation layer 6 above the backfill soil layer 5 .

This specific embodiment is only an explanation of the present invention, and it is not a limitation of the present invention. Those skilled in the art can make modifications to this embodiment without creative contribution as required after reading this specification, but as long as they are within the rights of the present invention All claims are protected by patent law.

Claims (10)

1. a kind of land subsidence crack resistence construction method, which comprises the steps of:

S1: basic ground (1) compacting；

S2: ground beam (2) are inserted into the basic ground (1) after compacting, and basic ground (1) is compacted again；

S3: being inserted with vertical reinforcing bar (22) inside ground beam (2), and vertical reinforcing bar (22) diameter is 8mm, and is poured on ground beam (2) Build retaining wall (21)；

S4: packing layer (3) are laid on basic ground (1), and packing layer (3) is compacted；Packing layer (3) with a thickness of 450mm-550mm, packing layer (3) are made of rubble and cohesive soil, packing layer (3) dry density >=2.1t/m, and ballast grain sizes≤ 50mm；

S5: in the top casting concrete plate layer (4) of packing layer (3), Concrete cover (4) with a thickness of 120mm, while mixed It is embedded with multiple reinforced steels (41) in concrete board layer (4), the diameter of reinforced steel (41) is 8mm, adjacent reinforced steel (41) Between distance be 200mm, in casting concrete plate layer (4), there are structural joint (42), structural joints between Concrete cover (4) (42) and ground beam (2) is in same vertical plane；

S6: being equipped with back fill course (5) above Concrete cover (4), and is compacted to back fill course (5);

S7: a layer concrete bonding course (6) is poured above back fill course (5).

2. a kind of land subsidence crack resistence construction method according to claim 1, it is characterised in that: in S4, rubble and viscous Property soil ratio be 3:7.

3. a kind of land subsidence crack resistence construction method according to claim 1, it is characterised in that: in S4, packing layer (3) Using the method for compaction in layers, lift height 250mm, compacting factor is not less than 0.95.

4. a kind of land subsidence crack resistence construction method according to claim 1, it is characterised in that: in S4, in packing layer (3) elastic layer (7) that a layer thickness is 15mm is equipped with above, elastic layer (7) is made of epoxy resin and rubber powder.

5. a kind of land subsidence crack resistence construction method according to claim 1, it is characterised in that: in S5, structural joint (42) width is 30mm.

6. a kind of land subsidence crack resistence construction method according to claim 1, it is characterised in that: in the vertical direction, Retaining wall (21) is arranged in the side of structural joint (42).

7. a kind of land subsidence crack resistence construction method according to claim 1, it is characterised in that: in back fill course (5) Graded sand rock layers (8) are equipped between concrete bonding course (6).

8. a kind of land subsidence crack resistence construction method according to claim 1, it is characterised in that: in adjacent retaining wall (21) it is connected with horizontal securing plate (9) between, the link slot that vertical interface is in convex is reserved on retaining wall (21) (211), securing plate (9) is used cooperatively with link slot (211).

9. a kind of land subsidence crack resistence construction method according to claim 8, it is characterised in that: adjacent securing plate (9) The distance between be 100mm.

10. a kind of land subsidence crack resistence structure, it is characterised in that: from bottom to up successively include basic ground (1), packing layer (3), elastic layer (7), Concrete cover (4), back fill course (5), sand stone layer (8) and concrete bonding course (6), in basic ground (1) ground beam (2) are equipped between packing layer (3), ground beam (2) one end is inserted into basic ground (1), and packing layer (3) are inserted into one end It is interior, it is inserted on ground beam (2) vertical reinforcing bar (22), and pour retaining wall (21) on ground beam (2), is stayed on retaining wall (21) Equipped with link slot (211), it is equipped with the matched securing plate (9) used in link slot (211), is opened in Concrete cover (4) Equipped with structural joint (42).