CN112627249B - Construction method for shallow foundation reinforcement - Google Patents
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- E—FIXED CONSTRUCTIONS
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- E02D37/00—Repair of damaged foundations or foundation structures
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Abstract
The invention discloses a construction method for shallow foundation reinforcement, and belongs to the technical field of building construction. The construction method specifically comprises the following steps: (1) construction preparation, namely determining construction related parameters; (2) excavating the earth around the shallow foundation to a designed elevation; (3) constructing the section steel hoop layer by layer; (4) carrying out layered excavation construction on deep foundation earthwork; (5) carrying out concrete support layered construction; (6) deep foundation structure construction, deep and shallow foundation earthwork backfill construction. By adopting the technical scheme of the invention, the problems of complicated operation, delay of construction period, waste of cost and the like of reinforcing and supporting the built shallow foundation building when the construction is carried out in the sequence of shallow construction and deep construction in the prior art can be effectively solved. Meanwhile, the construction method is simple, high in safety and relatively low in construction cost.
Description
Technical Field
The invention belongs to the technical field of building construction, and particularly relates to a construction method for shallow foundation reinforcement.
Background
In the building construction process, the traditional foundation construction sequence is usually 'deep first and then shallow', and the construction sequence can effectively ensure the safety and stability of the foundation pit and the surrounding structures. However, in actual construction, especially in the process of smelting construction, due to various reasons such as limited space of a construction site plane, arrangement of construction organization and the like, a construction sequence of "shallow first and deep second" is adopted in many construction processes. If reinforcement protection is not carried out on the shallow foundation in the earlier stage, large excavation is carried out forcibly in the follow-up stage, the displacement of the shallow foundation and the upper structure thereof can be caused greatly, and therefore greater economic loss is caused. Therefore, when a construction sequence of 'shallow first and deep second' is implemented, the traditional method is that a cast-in-place pile is used for supporting and reinforcing the excavated shallow foundation, but the construction process of the method is complicated, so that the construction period is delayed, and the cost is wasted.
For example, the Chinese patent application number is: 201910353011.0, application date of 2019, 4 and 29, the name of the invention is: a deformation control structure and a construction method for a foundation pit of a shallow foundation building close to an underground parking lot in a soft soil stratum are disclosed. The foundation pit deformation control structure disclosed in the application comprises a row of passive piles arranged in a foundation pit in parallel with a cast-in-situ bored pile supporting structure, wherein a pit bottom supporting beam is arranged between a passive pile crown beam and the cast-in-situ bored pile supporting structure; a passive area mixing pile reinforcing body is arranged between the passive pile and the cast-in-situ bored pile supporting structure; the setting height of a supporting beam of the foundation pit is 10-20cm higher than the position above a top plate of an underground parking lot, and the top of the supporting beam is basically flush with the top of a crown beam of a bored pile supporting structure; a plurality of rows of PVC pipes used for filling static crushing agents are arranged in the beam body of the supporting beam close to the lap joint of the supporting beam, and hanging rings are pre-embedded in the top of the supporting beam and the top of the lap joint of the supporting beam. Adopt the bored concrete pile to strut shallow foundation in the upper strata promptly in this application to improve through the concrete structure to the bored concrete pile, thereby realize controlling the deformation that closes on shallow foundation building foundation ditch, in order to reduce its influence to closing on shallow foundation building. However, the supporting structure of the application is complex, the construction process is complicated in the actual construction process, and the defects of delay of construction period and waste of cost are inevitable.
For another example, the chinese patent application No. is: 201811584698.0, application date is 2018, 12 and 24, and the name of the invention is: a deviation rectifying and reinforcing structure for shallow foundation buildings. The structure disclosed in the application comprises a reinforcing base, a ground anchor, a reserved nut I, a fixing screw I, a groove, a protrusion I, a semi-solid I, a notch I, a pouring hole I, a lower adjusting screw I, a lower locking nut I, a pull rod I, an upper adjusting screw I, an upper locking nut I, an adjusting nut I, a connecting pin I, a connecting shaft I and a clamping plate I. On the one hand, the base is reinforced through concrete pouring in the foundation around the building pile body, and the reinforcing effect is improved. On the other hand, the inclination angle of the whole building pile body is corrected and adjusted through the arrangement of the lower adjusting screw and the upper adjusting screw. However, the structure adopted in the application is complex, the construction operation is complicated, and the construction period is delayed.
Disclosure of Invention
1. Problems to be solved
The invention provides a construction method for shallow foundation reinforcement, aiming at the defects that when construction is carried out in a sequence of 'shallow first and deep later' in the prior art, the operation of reinforcing and supporting a built shallow foundation building is complex, the construction period is delayed, the cost is wasted and the like. By adopting the technical scheme of the invention, the reinforcing effect on the shallow foundation building on the upper layer can be obviously improved, the construction is convenient, the construction period is greatly shortened, and the construction method is simple, high in safety and relatively low in construction cost.
2. Technical scheme
In order to solve the problems, the technical scheme adopted by the invention is as follows:
the invention relates to a construction method for shallow foundation reinforcement, which comprises the following steps:
the method comprises the following steps: construction preparation, namely determining construction related parameters;
step two: excavating the earth around the shallow foundation to a designed elevation;
step three: constructing the section steel hoop layer by layer;
step four: carrying out layered excavation construction on deep foundation earthwork;
step five: carrying out concrete support layered construction;
step six: deep foundation structure construction, deep and shallow foundation earthwork backfill construction.
Furthermore, in the third step, firstly, after the earthwork is excavated to the bottom elevation of the shallow foundation, controlling the verticality of the vertical steel hoop, wherein the pile pressing sequence is started from the length direction of the cross section of the reinforced shallow foundation and is performed along the circumferential direction of the reinforced shallow foundation, meanwhile, the top end of the vertical steel hoop is controlled to be exposed to 150mm above the bottom elevation of the shallow foundation, and the bottom of the vertical steel hoop is driven into the designed elevation of the foundation; then, performing first construction of surrounding and embracing the vertical section steel hoop by the transverse section steel hoop by utilizing the pile pressing operation plane; performing secondary transverse steel hoop construction at the position of the reinforced shallow foundation layered earthwork excavation depth of 1.5-2.0 m; and finally, excavating to a deep foundation elevation.
Furthermore, the vertical steel hoop is constructed by adopting a vibration hydraulic hammer, and the vertical steel hoop is arranged at equal intervals and is constructed.
Furthermore, the process of determining the distance between the adjacent vertical steel hoops is as follows:
when the soil layer for reinforcement is less than 5m, adopting 175 or 200H-shaped steel or I-shaped steel, wherein the length of the H-shaped steel or I-shaped steel is 9m, and the distance between the adjacent vertical steel hoops is 15 cm;
when the soil layer is reinforced to be larger than 5m, 250 or 300H-shaped steel or I-shaped steel is adopted, the length of the H-shaped steel or I-shaped steel is preferably 15m, and the adjacent vertical steel hoops are closely and densely arranged.
Furthermore, in the fifth step, concrete is filled around the supporting structure which is below the elevation of the shallow foundation base and consists of the vertical section steel hoops and the horizontal section steel hoops.
Furthermore, in the fifth step, the filling thickness of the concrete is 150-200mm away from the outermost lateral horizontal hoop.
Furthermore, in the fifth step, a quincuncial threaded 12-bar anchor claw is welded at the position of the surface of the vertical section steel hoop and the surface of the transverse section steel hoop, which are spaced by 250-300mm, and is used for fully wrapping and connecting the concrete to the reinforcing device.
Furthermore, in the first step, firstly, before the shallow foundation is excavated, the upper opening edge line of the earthwork excavation is measured, positioned and paid off on the natural terrace according to the upper opening edge line of the earthwork excavation, and lime is used for scattering the upper opening edge line of the earthwork excavation of the foundation;
then, determining the elevation of the bottom of the built shallow foundation of mechanical earthwork excavation, excavating a deep foundation bottom plate at the periphery of the built shallow foundation to the elevation of the bottom of the shallow foundation during excavation, and carrying out vertical section steel hoop pile pressing;
and finally, after the construction of the steel hoop is finished, excavating to a position 20-25cm above the design bottom elevation of the deep foundation layer by layer, and then excavating to the design bottom elevation manually.
Furthermore, in the second step, two sides of the earthwork around the shallow foundation are symmetrically excavated in a layered mode, and the earthwork is excavated to the elevation position of the bottom of the shallow foundation.
Furthermore, in the fourth step, the deep foundation is excavated to the elevation of the designed bottom in two layers, the first layer is excavated to the elevation of the shallow foundation bottom by the slope coefficient of 1: 0.5; and excavating the second layer with a slope coefficient of 1:1 to the elevation of the bottom of the deep foundation.
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the construction method for shallow foundation reinforcement, disclosed by the invention, through optimizing and designing the construction steps, the defects of supporting by using a cast-in-place pile in the traditional sequential construction process of firstly shallow and then deep are effectively overcome, and during subsequent excavation, the built shallow foundation on the upper layer and the upper structure of the shallow foundation can not be displaced, so that larger economic loss is avoided.
(2) The invention relates to a construction method for shallow foundation reinforcement, which is used for supporting and reinforcing a shallow foundation by arranging a section steel hoop around the built shallow foundation. Specifically, this shaped steel staple bolt adopts the layering construction, and earlier vertical shaped steel staple bolt of being under construction all around along the shallow basis of having built promptly, then the construction centers on this vertical shaped steel staple bolt's horizontal shaped steel staple bolt again, adopts this combination supporting construction can effectively be applicable to the basic construction of unusual construction order "first dark back shallow", and simultaneously, its structure is simple relatively, and the support effect is good, and it is fast to strut the construction speed, has shortened the time limit for a project greatly.
(3) According to the construction method for shallow foundation reinforcement, the depth of a construction soil layer and the specific load of the construction soil layer are combined, the materials and the size of the vertical steel hoops and the distance between the two vertical steel hoops connected with the vertical steel hoops are optimized, so that the installation stability of the whole structure can be effectively guaranteed, and when the construction method is used for supporting the upper-layer shallow foundation, the upper-layer shallow foundation can be prevented from being displaced in the construction process, and the larger economic loss is avoided. Meanwhile, when the section steel anchor ear is constructed, equipment investment is simple, construction can be completed only by entering a large-scale machine, the entering and exiting cost is reduced, and the section steel concrete anchor ear is made of small-size section steel and few plain concrete, so that the construction cost is lower than that of a conventional hole digging cast-in-place pile support.
(4) According to the construction method for shallow foundation reinforcement, the C20 plain concrete is used for filling, the cost is low, the filling thickness is optimized, and the reinforcement effect can be improved. Meanwhile, in order to further improve the firmness and stability of the whole combined supporting structure, the surface of the section steel hoop is also provided with the anchor claws distributed in a plum blossom shape, so that the filled concrete and the section steel hoop for reinforcement can be fully wrapped and connected, and the reinforcement is firmer. On one hand, compared with the traditional cast-in-place pile hole forming construction method, the combined supporting structure (namely the concrete section steel hoop structure) adopted in the invention has the advantages of small occupied space, relatively low cost, small noise and dust, small soil sampling amount and environmental protection. On the other hand, the concrete is adopted to wrap the whole body, and the stability of the reserved structure, the adjacent structure and the equipment can be effectively guaranteed.
(5) According to the construction method for shallow foundation reinforcement, the construction sequence is optimized, the support construction speed is high, the construction period is greatly shortened, the steel reinforced concrete anchor ear only needs mechanical construction, personnel do not need to operate purely manually like a manhole hole digging pile, the construction is dangerous when entering the hole bottom, the man-machine safety is guaranteed, and the safety is good.
Drawings
Fig. 1 is a schematic top view of the combined supporting structure for shallow foundation reinforcement of the present invention;
fig. 2 is a side sectional structural view of the combined supporting structure for shallow foundation reinforcement of the present invention.
In the figure:
1. a transverse steel hoop; 2. a vertical steel hoop; 3. shallow foundation; 4. fixing the pile; 5. shallow foundation elevation; 6. making a deep foundation elevation; 7. and (3) concrete.
Detailed Description
Aiming at the defects of inconvenient construction, delay of construction period and higher construction cost in the conventional construction sequence of adopting shallow and deep, the invention provides a construction method for a combined support of a section steel hoop and concrete for shallow foundation reinforcement. The main principle of the method is that firstly, the earthwork excavation at the periphery of the built shallow foundation 3 (pile foundation bearing platform) is carried out to the elevation of a substrate, the layered construction of the section steel pile hoops is carried out at the periphery of the cross section of the shallow foundation 3, the layered earthwork excavation of the deep foundation is carried out, and then the construction of the combination of the supporting concrete and the section steel is carried out. The earthwork of the lower foundation of the shallow foundation 3 (pile foundation bearing platform) is integrated, the earthwork collapse caused by disturbance is avoided, the shallow foundation 3 is protected, the displacement of the shallow foundation 3 and an upper structure is avoided, and meanwhile, the peripheral deep foundation can be constructed normally. The construction method disclosed by the invention is simple to operate, high in safety, and beneficial to greatly shortening the construction period and saving the construction cost.
The invention is further described with reference to specific examples.
Example 1
As shown in fig. 1 and 2, the construction method for shallow foundation reinforcement of the present invention specifically includes the following steps:
the method comprises the following steps: preparation of construction, determination of construction-related parameters
(1) Before the built shallow foundation 3 (a plurality of fixed piles 4 are arranged below the shallow foundation 3 for supporting) is excavated, the upper opening edge of the foundation earthwork excavation is scattered by lime after the natural terrace is measured, positioned and paid off according to the upper opening edge of the earthwork excavation.
(2) And determining the elevation of the bottom of the built shallow foundation of the mechanical earthwork excavation, and excavating to the elevation of the bottom of the shallow foundation by taking the deep foundation bottom plate at the periphery of the built shallow foundation 3 as a foundation during excavation due to the deep foundation bottom plate at the periphery of the built shallow foundation 3, and performing pile pressing by using the vertical steel hoop 2. After the construction of the vertical steel hoop 2 is completed, the vertical steel hoop is excavated to the position 20-25cm above the designed bottom elevation of the deep foundation in a layered mode, and the rest part of the vertical steel hoop is excavated to the designed bottom elevation of the deep foundation (namely the deep foundation elevation 6 in the drawing 2) by manpower.
(3) And (6) measuring, positioning and paying off. According to a plane positioning diagram, a foundation plane layout diagram, a foundation structure design construction diagram, an excavation bottom elevation and the like of a project, calculating plane and elevation data related to measurement positioning, measuring the elevation of a natural terrace according to the designed +/-0.000 elevation, and determining the excavation depth of foundation earthwork and the like.
(4) And (5) entering a mechanical device. The mechanical equipment comprises a conventional earth-digging machine and a vibrating hydraulic hammer pile driver. The invention has the advantages of simple equipment investment, low in-out cost, simple construction process and obvious construction period saving.
Step two: excavating the peripheral earthwork of the shallow foundation 3 to the designed elevation
(1) And excavating the earthwork layer by layer to the bottom elevation position of the shallow foundation (namely, the position 1.5-2m below the elevation 5 of the shallow foundation in the figure 2).
(2) And symmetrically excavating the two sides of the periphery of the shallow foundation 3.
(3) Over excavation, messy excavation and random excavation are strictly forbidden for the foundation.
(4) At the periphery of a foundation pit, heavy-duty vehicles are strictly forbidden to pass and a large amount of loads and components are stacked during construction, and meanwhile, earthwork is strictly forbidden to be stacked just nearby along with excavation and transportation.
Step three: layered construction of section steel hoop
(1) And after the earthwork is excavated to the bottom elevation of the shallow foundation, the vertical steel hoop 2 is constructed by adopting a vibration hydraulic hammer.
(2) The construction of 2 piling bars of vertical shaped steel staple bolt is commandeered by the special messenger, according to the straightness that hangs down of interval, elevation control vertical shaped steel staple bolt 2, and the piling order is for starting from 3 cross-sectional length directions on the shallow foundation of reinforcement to go on along its hoop direction order, the top of controlling vertical shaped steel staple bolt 2 simultaneously exposes 150mm above the shallow foundation bottom elevation, and ground design elevation is squeezed into to its bottom. Wherein, a plurality of vertical shaped steel staple bolts 2 equidistance are arranged and are under construction, consider the actual conditions of job site, confirm vertical shaped steel staple bolt 2's reinforcement degree of depth and cross-sectional dimension.
In this embodiment, when the designed elevation of the foundation is deep, the reinforcement height of the shallow foundation 3 is from the bottom elevation of the deep foundation to the bottom elevation of the shallow foundation, and after calculation of the vertical load of the bearing soil layer, the lateral pressure of the soil and the like, the specification and the model of the material adopted by the steel hoop reinforcement foundation are determined according to the performances of the various hoop materials such as rigidity (the cross section of the hoop material is too small, the rigidity is not enough, the hoop material is deformed when being driven into the soil layer, the supporting and protecting effect cannot be achieved, the cross section is too large, the hoop cannot be driven into the specified depth, and the supporting and protecting effect cannot be achieved as well). After various checking calculations, the length of the vertical steel hoop 2 below the deep foundation base elevation and the reinforcement depth of the shallow foundation 3 are considered according to the ratio of 1:1, the vertical steel hoop 2 is driven into the ground from the shallow foundation 3 base elevation, the vertical steel hoop 2 is arranged along the periphery of the shallow foundation 3 at intervals, and the specific interval numerical value is determined through soil layer load calculation and the type of hoop reinforcement materials: when the soil layer for reinforcement is smaller than 5m, the center distance between two adjacent vertical steel hoops 2 can be 15cm, the hoops are made of H-shaped steel or I-shaped steel with the size of 200 or 175, and the hoops can be made of standard length materials with the length of 9 m; when the soil layer is reinforced to be more than 5m, the rigidity of hoop materials and whether the hoop materials can be driven into the soil layer (the soft plasticity of soil quality) are required to be considered, H-shaped steel and I-shaped steel with the size of 250 or 300 can be adopted, the distance between every two adjacent vertical section steel hoops 2 can be densely distributed and tightly attached to the periphery of a shallow foundation 3 to be reinforced, and the length of each hoop material can be 12 m. The size of the cross section of the vertical steel hoop 2 is determined according to the maximum size of the bottom surface of the shallow foundation 3. Through the selection material to vertical shaped steel staple bolt 2, size and the interval of two vertical shaped steel staple bolts 2 that link to each other optimize to can effectively guarantee the installation stability of overall structure, when being used for strutting shallow basis 3 in upper strata, can prevent that it from taking place the displacement in the work progress, avoid causing bigger economic loss.
(3) After the design elevation of ground is all squeezed into to vertical shaped steel staple bolt 2, utilize the pile pressing operation plane, carry out the construction of horizontal shaped steel staple bolt 1 encloses and embraces vertical shaped steel staple bolt 2 of first way, mainly adopt the welded connection mode to be main, and local manual work, mechanical cooperation are consolidated and are connected, ensure that level, vertical staple bolt connect reliably.
(4) After the construction of the first horizontal steel hoop 1 surrounding the vertical steel hoop 2 is completed, reinforcing shallow foundation 3 earthwork layered excavation is started, excavation is carried out from the design bottom elevation of the shallow foundation to the design bottom elevation of the deep foundation, the reinforcing depth of the shallow foundation 3 is limited, the layered earthwork excavation depth of the general reinforced shallow foundation 3 is 1.5m-2.0m, and then secondary horizontal steel hoop 1 construction is carried out after the layered earthwork excavation is completed. The horizontal steel hoop 1 is arranged along the horizontal distance of the depth direction of excavation, and the specific distance numerical value is based on actual load calculation.
Step four: deep foundation earthwork layered excavation construction
(1) And excavating the deep foundation to the elevation of the designed bottom in two layers, excavating the first layer by using the slope coefficient of 1:0.5, and excavating to the elevation of the shallow foundation bottom.
(2) After the construction of the first transverse steel hoop, a second layer of soil layer is excavated to the deep foundation according to the calculated slope coefficient of 1:1, the layer is excavated to the bottom elevation of the deep foundation according to the excavation depth in a layering mode, the earthwork layered excavation depth is 1.5m-2.0m, and layered earthwork excavation and layered transverse horizontal steel hoop construction are carried out at intervals.
Step five: concrete support layered construction
(1) C20 plain concrete is filled and compacted around a supporting structure consisting of a vertical steel hoop 2 and a horizontal steel hoop 1 below the base elevation of the shallow foundation 3.
(2) The surface interval of vertical shaped steel staple bolt 2 and horizontal shaped steel staple bolt 1 is 250 and 300mm (preferably 300 mm) plum blossom form arranges welding screw thread 12 reinforcing bar fluke (the length of fluke is 250mm, when the space is not foot branch, can be with fluke side bend), and it is more firm to let filled concrete and supporting construction shaped steel staple bolt fully wrap up to be connected, consolidate. The reinforcing width of the filling concrete is generally 150-200mm of the lateral horizontal hoop at the outermost side, and the filling concrete can be poured in layers according to the reinforcing depth. Compared with the traditional cast-in-place pile hole forming construction method, the construction method has the advantages of small occupied space of machines and tools, relatively low cost, small noise and dust, small soil sampling amount and environmental protection. On the other hand, the concrete is adopted to wrap the whole body, and the stability of the reserved structure, the adjacent structure and the equipment can be effectively guaranteed.
Step six: deep foundation structure construction, deep and shallow foundation earthwork backfill construction
(1) And after the backfilling construction is finished, the whole construction process can be finished. By optimizing the construction sequence of the invention, the construction speed of supporting is fast, the construction period is greatly shortened, the steel reinforced concrete anchor ear only needs mechanical construction, personnel does not need to perform pure manual operation like a manhole hole digging pile, the construction at the bottom of a hole is dangerous, the man-machine safety is guaranteed, and the safety is good.
Claims (9)
1. A construction method for shallow foundation reinforcement is characterized in that: the method comprises the following steps:
the method comprises the following steps: construction preparation, namely determining construction related parameters;
step two: excavating the earth around the shallow foundation to a designed elevation;
step three: the sectional steel hoop layered construction comprises the vertical sectional steel hoop (2) and the horizontal sectional steel hoop (1), pile pressing sequence of the vertical sectional steel hoop (2) is from the length direction of the cross section of the reinforced shallow foundation (3) and is arranged along the circumferential direction of the reinforced shallow foundation in sequence, and the horizontal sectional steel hoop (1) surrounds the vertical sectional steel hoop (2) for construction;
step four: carrying out layered excavation construction on deep foundation earthwork;
step five: carrying out concrete support layered construction; filling concrete (7) around a reinforcement body which is below the elevation of the shallow foundation base and consists of a vertical steel hoop (2) and a transverse steel hoop (1);
step six: deep foundation structure construction, deep and shallow foundation earthwork backfill construction.
2. A construction method for shallow foundation reinforcement according to claim 1, characterized in that: in the third step, firstly, after the earthwork is excavated to the bottom elevation of the shallow foundation, controlling the verticality of the vertical steel hoop (2), simultaneously controlling the top end of the vertical steel hoop (2) to be exposed to 150mm above the bottom elevation of the shallow foundation, and driving the bottom of the vertical steel hoop into the designed elevation of the foundation; then, utilizing the pile pressing operation plane to carry out construction of surrounding the vertical steel hoop (2) by the first horizontal steel hoop (1); secondary transverse steel hoop (1) construction is carried out at the position where the reinforced shallow foundation layered earthwork excavation depth is 1.5-2.0 m; and finally, excavating to a deep foundation elevation (6).
3. A construction method for shallow foundation reinforcement according to claim 2, characterized in that: vertical shaped steel staple bolt (2) adopt the construction of vibration hydraulic hammer, and vertical shaped steel staple bolt (2) equidistance is arranged and is under construction.
4. A construction method for shallow foundation reinforcement according to claim 2, characterized in that: the process of determining the distance between the adjacent vertical steel hoops (2) is as follows:
when the soil layer for reinforcement is less than 5m, adopting 175 or 200H-shaped steel or I-shaped steel, wherein the length of the H-shaped steel or I-shaped steel is 9m, and the distance between the adjacent vertical steel hoops (2) is 15 cm;
when the soil layer is reinforced to be larger than 5m, 250 or 300H-shaped steel or I-shaped steel is adopted, the length of the H-shaped steel or I-shaped steel is 15m, and the adjacent vertical steel hoops (2) are closely and densely arranged.
5. A construction method for shallow foundation reinforcement according to any one of claims 1-4, characterized in that: in the fifth step, the filling thickness of the concrete (7) is 200mm away from the outermost lateral horizontal hoop.
6. A construction method for shallow foundation reinforcement according to claim 5, characterized in that: and step five, welding the threaded 12 steel bar flukes arranged in a plum blossom shape at the surface interval of 250-300mm between the vertical section steel hoop (2) and the transverse section steel hoop (1) for fully wrapping the concrete (7) and connecting the concrete to the reinforcing device.
7. A construction method for shallow foundation reinforcement according to claim 6, wherein: firstly, before the excavation of the built shallow foundation (3), measuring, positioning and paying off the natural terrace according to the uppermost opening side line of the earthwork excavation, and scattering the upper opening side line of the earthwork excavation of the foundation by lime;
then, determining the bottom elevation of the built shallow foundation excavated by mechanical earthwork excavation, excavating a deep foundation bottom plate around the built shallow foundation (3) to the bottom elevation of the shallow foundation during excavation, and performing pile pressing by using a vertical steel hoop (2);
and finally, after the construction of the steel hoop is finished, excavating to a position 20-25cm above the design bottom elevation of the deep foundation layer by layer, and then excavating to the design bottom elevation manually.
8. A construction method for shallow foundation reinforcement according to claim 7, characterized in that: and in the second step, symmetrically and hierarchically excavating the two sides of the earthwork at the periphery of the shallow foundation (3) to the elevation position of the bottom of the shallow foundation.
9. A construction method for shallow foundation reinforcement according to claim 8, wherein: in the fourth step, the deep foundation is excavated to the elevation of the designed bottom in two layers, the first layer is excavated to the elevation of the shallow foundation bottom by the slope coefficient of 1: 0.5; and excavating the second layer with a slope coefficient of 1:1 to the elevation of the bottom of the deep foundation.
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