CN219137698U - Foundation pit diagonal bracing supporting structure with adjustable axial force - Google Patents
Foundation pit diagonal bracing supporting structure with adjustable axial force Download PDFInfo
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- CN219137698U CN219137698U CN202223326995.XU CN202223326995U CN219137698U CN 219137698 U CN219137698 U CN 219137698U CN 202223326995 U CN202223326995 U CN 202223326995U CN 219137698 U CN219137698 U CN 219137698U
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Abstract
A foundation pit diagonal bracing supporting structure with adjustable axial force belongs to the technical field of internal support of foundation pit engineering building envelope. The hydraulic axial force adjusting system comprises a steel pipe diagonal bracing, a diagonal bracing counterforce structure, an enclosure structure and a hydraulic axial force adjusting system; the enclosure structure comprises an upright post pile, a temporary upright post, a cement stirring pile, cement stirring soil and a bored pile, and the temporary upright post is arranged above the upright post pile; one end of the steel pipe diagonal bracing is connected with the diagonal bracing buttress, and the other end of the steel pipe diagonal bracing is connected with the crown beam; the steel pipe diagonal bracing comprises an automatic diagonal bracing buttress joint and a common steel pipe joint; the diagonal bracing buttress is arranged on the structural bottom plate; the hydraulic shaft force adjusting system comprises a pressure sensor, a hydraulic power station and a control system. The utility model adopts the large-slope back pressure design, and carries out back pressure support on the bottom of the foundation pit and the enclosure structure in the process of excavation, replaces temporary concrete support in foundation pit engineering, and accords with the concepts of saving cost and green construction; the large slope can be used as temporary traffic, so that large machinery can conveniently go in and out of operation, and the operation efficiency is improved.
Description
Technical Field
The utility model relates to the technical field of internal support of foundation pit engineering support structures, in particular to a foundation pit diagonal bracing support structure with adjustable axial force.
Background
Along with the saturation of ground space development, underground engineering formed by deep foundation pit construction is continuously increased to efficiently relieve the situation of shortage of urban land, discover the development potential of underground space. Aiming at large-scale deep foundation pit engineering, compact construction among various working procedures of the engineering is realized while deformation control and overall stability in the deep foundation pit excavation process are ensured, negative influence of deep foundation pit engineering excavation on surrounding environment is eliminated, and the critical problem to be solved in the deep foundation pit engineering is urgent.
The conventional foundation pit engineering adopts a temporary support system, and in the construction process of a permanent structure of the underground engineering, the temporary support structure of the foundation pit engineering is erected and dismantled, so that materials are wasted, the construction period is prolonged, and the potential safety hazards of the engineering exist, such as incorrect dismantling construction, which can cause casualties and great economic loss.
Disclosure of Invention
In order to overcome the defects in the prior art, the utility model provides a deep foundation pit diagonal bracing soil-retaining back pressure combined support construction device; the method has the advantages of simple working procedures, safe construction and low construction cost, and can effectively solve the problems of large resource consumption and poor safety commonly existing in foundation pit engineering.
The technical scheme adopted for solving the technical problems is as follows:
the foundation pit diagonal bracing supporting structure comprises a steel pipe diagonal bracing, a diagonal bracing counterforce structure for providing counterforce for the steel pipe diagonal bracing, an enclosure structure and a hydraulic axial force adjusting system, wherein the axial force of the enclosure structure is adjustable;
the steel pipe diagonal bracing comprises an automatic diagonal bracing buttress section and a common steel pipe section connected with the automatic diagonal bracing buttress section;
the diagonal bracing reaction structure comprises a prefabricated diagonal bracing buttress and a detachable diagonal pile foundation connected with the prefabricated diagonal bracing buttress;
the building enclosure comprises a stand column pile, a temporary stand column arranged above the stand column pile, a large slope arranged on the outer side of the stand column pile, a cement stirring pile, cement stirring soil and a bored pile arranged on the inner side of the stand column pile;
the bottom fixed end of the steel pipe diagonal bracing is connected with the prefabricated diagonal bracing support pier, and the top fixed end of the steel pipe diagonal bracing is connected with the enclosure structure; the steel pipe diagonal bracing is fixedly connected with the temporary upright post;
the hydraulic axial force adjusting system is used for monitoring axial force change in the foundation pit in real time and performing telescopic control on the automatic section of the diagonal bracing buttress.
Further: the prefabricated diagonal bracing buttress is connected with the steel pipe diagonal bracing and detachable diagonal pile foundation through the prefabricated connecting piece; the detachable inclined pile foundation is a prefabricated pile foundation.
Further: the top of the bored pile is provided with a crown beam, a steel backing plate is arranged in the crown beam, and the top fixed end of the steel pipe diagonal bracing is connected with the steel backing plate; and pouring the crown beam after the steel backing plate is embedded and laid.
Further: and a post-pouring belt is arranged on a structural bottom plate of the foundation pit diagonal bracing supporting structure, and the structural bottom plate is connected with the bored pile through a support changing belt.
Further: and concrete slope protection is sprayed on the large slope.
Further: the hydraulic axial force adjusting system comprises a pressure sensor for monitoring the axial force change condition in the foundation pit in real time, a hydraulic power station for detecting data in real time and a control system for controlling the hydraulic power station to carry out telescopic control on the automatic section of the diagonal bracing buttress according to the detected data.
Compared with the prior art, the utility model has the beneficial effects that:
1) The utility model adopts the design of the large-scale slope back pressure structure, can carry out back pressure support on the bottom of the foundation pit and the enclosing structure in the process of excavation, replaces temporary concrete support in foundation pit engineering, accords with the concept of saving cost and green construction, can be used as temporary traffic, is convenient for large-scale machinery to go in and out operation, and improves the operation efficiency;
2) According to the utility model, concrete is sprayed on the slope surface of the large-scale slope to perform slope protection treatment, so that accidents such as landslide and the like caused by construction disturbance are prevented, the overall stability of the large-scale slope is improved, and the construction safety and reliability are improved;
3) According to the utility model, the large-slope part is supported by adopting the steel pipe diagonal bracing with the hydraulic axial force adjusting system and the temporary upright post in a combined manner, so that the support dismantling and changing process related to the temporary concrete horizontal internal support in the conventional foundation pit construction is omitted, the underground structure construction operation is compactly connected with the sudden excavation, the process is simplified, the construction period is shortened, and the construction efficiency is improved;
4) According to the utility model, the hydraulic axial force adjusting system is arranged, so that the stress and deformation conditions in the foundation pit are monitored at any time, and the steel support axial force is accurately calculated in time and automatically adjusted, so that the stress balance in the foundation pit is maintained, the deformation of the foundation pit is effectively controlled, and the adverse effect on the surrounding environment is reduced;
5) In the utility model, the steel pipe diagonal bracing is adopted to replace the reinforced concrete temporary bracing in the original foundation pit construction, and blasting demolition is not needed after the construction of the structure in the foundation pit is completed, so that the construction cost is saved and the environment is protected;
6) Compared with the reinforced concrete temporary support, the steel pipe diagonal bracing is lighter in dead weight, can effectively avoid serious displacement of soil body in a passive area in soft soil construction, and has little influence on surrounding environment;
7) In the utility model, the detachable inclined pile foundation and the prefabricated diagonal bracing buttress are provided with the inclined steel support with the hydraulic axial force adjusting system to support the counterforce, the installation of the detachable inclined pile foundation and the prefabricated diagonal bracing buttress is synchronous with the construction of the foundation pit bottom plate, and meanwhile, the detachable inclined pile foundation and the prefabricated diagonal bracing buttress can be quickly connected through the prefabricated connecting piece, compared with the traditional cast-in-situ diagonal bracing buttress, the construction period is greatly saved, and the engineering construction progress is accelerated;
8) The detachable inclined pile foundation and the prefabricated inclined strut pier can be recycled in similar engineering after being removed, and the construction method meets the construction concepts of green, environment protection and low carbon.
Drawings
FIG. 1 is a side view of a deep foundation pit diagonal bracing soil-retaining back pressure composite support of the present utility model;
fig. 2 is a schematic view of earth excavation, a diagonal bracing steel pipe with a hydraulic axial force adjusting system, a prefabricated diagonal bracing pier, a detachable diagonal pile foundation, temporary column removal, and structural floor construction completion.
Detailed Description
The utility model is described in further detail below with reference to the drawings and examples.
As shown in fig. 1-2, the present embodiment provides a foundation pit diagonal bracing support structure with adjustable axial force, which comprises a steel pipe diagonal bracing 1, a diagonal bracing reaction structure, an enclosure structure and a hydraulic axial force adjusting system.
Specifically, the enclosure structure comprises an upright post pile 3, a temporary upright post 4, a cement stirring pile 7, cement stirring soil 8 and a bored pile 9, wherein the temporary upright post 4 is arranged above the upright post pile 3, and a large slope 5 is arranged on the outer side of the upright post pile 3; the top end of the bored pile 9 is provided with a crown beam 10, a steel backing plate is arranged in the crown beam 10, and the crown beam 10 is poured after the steel backing plate is embedded and laid during construction.
Specifically, the steel pipe diagonal bracing 1 comprises an automatic diagonal bracing buttress section 1-1 and a common steel pipe section 1-2, and the automatic diagonal bracing buttress section 1-1 is connected with the common steel pipe section 1-2 through bolts; the steel pipe diagonal bracing 1 is welded with the temporary upright post 4, so that foundation pit deformation is effectively controlled when the large slope 5 is excavated.
Specifically, the diagonal bracing reaction structure comprises a prefabricated diagonal bracing buttress 2-1 and a detachable diagonal pile foundation 2-2; the bottom end fixed end of the automatic diagonal bracing pier joint 1-1 is fastened with the prefabricated diagonal bracing pier 2-1 through bolts, and the top end fixed end is welded with the steel backing plate; the prefabricated diagonal bracing buttress 2-1 is embedded with a prefabricated connecting piece, and the prefabricated diagonal bracing buttress 2-1 is connected with the steel pipe diagonal bracing 1 and the detachable diagonal pile foundation 2-2 through the prefabricated connecting piece; the detachable inclined pile foundation 2-2 is a prefabricated pile foundation.
Specifically, set up post-cast strip 12 on foundation ditch bracing supporting construction's the structure bottom plate 11, pour after the earth excavation is complete, structure bottom plate 11 is connected with drilling bored concrete pile 9 through trading the area of propping.
Specifically, the hydraulic shaft force adjusting system comprises a pressure sensor, a hydraulic power station and a control system.
The control system analyzes the numerical value transmitted by the pressure sensor, and then controls the hydraulic power station to control the automatic inclined support pier section 1-1 in a telescopic way, so as to adjust the axial force value to maintain the axial force value of the foundation pit in a stable state; when the automatic section 1-1 of the diagonal bracing buttress stretches, the steel wedge is inserted between the loose end of the automatic section of the diagonal bracing buttress and the gap of the steel pipe diagonal bracing cylinder body, so that the loose end of the automatic section is stable, and the condition that the loose end of the automatic section slides downwards to cause construction accidents is avoided.
Specifically, a pressure sensor and a reserved interface are arranged on the automatic section 1-1 of the diagonal bracing buttress, and the reserved interface is used for connecting an oil inlet and outlet pipe, a pressure data line and a displacement data line; the pressure sensor is communicated with the control system; the control system dynamically adjusts the axial force value through the hydraulic power station according to the axial force in the foundation pit, and maintains the axial force within a design range; when the device is detached, the equipment on the orifice is detached first, and then the hoisting diagonal bracing is detached.
The embodiment provides a construction method of a foundation pit diagonal bracing supporting structure with adjustable axial force, which comprises the following steps:
s1, leveling a construction site, positioning and paying off, embedding a hole-forming pile casing, backfilling and tamping around the pile casing by clay layers, assembling an automatic section 1-1 of the diagonal bracing buttress with a common steel pipe section 1-2, and bundling a reinforcement cage for standby. The lowered pile casing has certain rigidity, ensures that the center line of the pile casing is basically coincident with the center line of the pile position, and is backfilled and tamped by clay after the pre-buried pile casing is completed.
S2, positioning by a drilling machine, guiding holes to a designed depth, vertically placing a lifting reinforcement cage into the holes after the holes are formed, deep into the holes by the guide pipes after the holes are formed, and pouring cement to a designed elevation to finish the construction of the cement mixing piles 7 and the cement mixing soil 8.
S3, after the cement stirring pile 7 and the cement stirring soil 8 reach the designed strength, leading holes in the cement stirring pile 7 and the cement stirring soil 8 area and constructing the bored pile 9, wherein the pile surface of the bored concrete pile 9 is lower than the natural ground after the bored pile 9 is constructed, and backfilling or capping is needed.
S4, after the building enclosure construction is completed, constructing the column pile 3, positioning the hole, pouring the column pile, then hanging the poured temporary column 4 into the hole, determining the placement depth according to the elevation of the column pile 3, and controlling the depth of the temporary column 4 inserted into the column pile 3.
S5, after the position of the crown beam 10 is determined, cleaning earthwork at the position of the crown beam 10, presetting a steel backing plate, and pouring the crown beam after the template is erected. After the crown beam 10 reaches the design strength, excavating earth on the inner side of the post-pouring belt 12, and simultaneously carrying out cushion follow-up construction.
S6, spraying concrete slope protection 6 after the excavation of partial earthwork is completed, spraying concrete to the soil slope from bottom to top, and after the concrete is solidified to reach the design strength, cutting the bottom of the large-scale slope 5, and spraying concrete slope protection 6 after the cutting is completed.
Wherein, when the first earth excavation, the big slope 5 sprays concrete bank protection 6, and when the second time is to the big slope 5 to cut the slope, spray concrete bank protection 6 again, twice sprays concrete bank protection 6 and is used for strengthening the stability of whole slope.
S7, after earthwork is stabilized, a detachable inclined pile foundation 2-2 is installed, after the prefabricated assembly type inclined pile buttress 2-1 is connected with the detachable inclined pile foundation 2-2, a pre-assembled steel pipe inclined strut 1 is hung and fixedly connected with a steel base plate and the prefabricated assembly type inclined pile buttress 2-1, and meanwhile, the prefabricated assembly type inclined pile buttress is welded and connected with a temporary upright post 4; and pouring the structural bottom plate 11, and reserving post-pouring belts 12 on the structural bottom plate 11 near the prefabricated diagonal bracing buttress 2-1.
Wherein, the detachable inclined pile foundation 2-2 can be installed through static pressure; the detachable inclined pile foundation 2-2 in the step 8 is pulled out through static force or vibration; the connection rigidity of the prefabricated diagonal bracing buttress 2-1, the detachable diagonal pile foundation 2-2, the steel pipe support 1, the steel base plate and the prefabricated diagonal bracing buttress 2-1 all meet the design requirement; the pouring structure bottom plate 11 can be designed according to construction organization, so that the pouring structure bottom plate is preferentially and synchronously installed with the prefabricated diagonal bracing buttress 2-1 and the detachable diagonal pile foundation 2-2, the construction period is saved, and the engineering construction progress is quickened. Or may be performed sequentially.
S8, the hydraulic axial force adjusting system detects an axial force value in real time, the control system dynamically adjusts the axial force value within a design range, after the earthwork on the inner side of the post-cast strip 12 is excavated, cushion layer laying and structure construction are completed, the temporary upright post 4 is removed, casting construction of the structural bottom plate on the inner side of the post-cast strip 12, the post-cast strip 12 and the support replacement strip is performed, and after the design strength is reached, the steel pipe diagonal bracing 1, the prefabricated diagonal bracing buttress 2-1 and the detachable diagonal pile foundation 2-2 are removed, and construction is completed.
The control system adjusts the axial force value to be in a proper range, and then inserts a steel wedge between the movable end of the automatic section 1-1 of the diagonal bracing buttress and the gap of the cylinder body of the steel pipe diagonal bracing 1, so as to realize wedging and locking; the deformation condition of the enclosure structure is required to be monitored in real time during the dismantling of the steel pipe diagonal bracing 1, the oil pipe, the pressure and displacement data lines are dismantled, then bolts are loosened, and the dismantling is carried out in regions; after the steel pipe diagonal bracing 1, the prefabricated assembled diagonal bracing buttress 2-1 and the detachable diagonal pile foundation 2-2 are dismantled, the steel pipe diagonal bracing and the prefabricated assembled diagonal bracing buttress can be recycled for other similar projects.
The technical principle of the present utility model is described above in connection with the specific embodiments. The description is made for the purpose of illustrating the general principles of the utility model and should not be taken in any way as limiting the scope of the utility model. Other embodiments of the utility model will be apparent to those skilled in the art from consideration of this specification without undue burden.
Claims (6)
1. The utility model provides a foundation ditch bracing supporting construction with adjustable axial force which characterized in that: the hydraulic axial force adjusting device comprises a steel pipe diagonal bracing (1), a diagonal bracing counterforce structure for providing counterforce for the steel pipe diagonal bracing (1), an enclosing structure and a hydraulic axial force adjusting system;
the steel pipe diagonal bracing (1) comprises an automatic diagonal bracing buttress section (1-1) and a common steel pipe section (1-2) connected with the automatic diagonal bracing buttress section (1-1);
the diagonal bracing reaction structure comprises a prefabricated diagonal bracing buttress (2-1) and a detachable diagonal pile foundation (2-2) connected with the prefabricated diagonal bracing buttress (2-1);
the building enclosure comprises a stand column pile (3), a temporary stand column (4) arranged above the stand column pile (3), a large slope (5) arranged on the outer side of the stand column pile (3), a cement stirring pile (7) arranged on the inner side of the stand column pile (3), cement stirring soil (8) and a bored pile (9);
the bottom fixed end of the steel pipe diagonal brace (1) is connected with the prefabricated diagonal brace buttress (2-1), and the top fixed end of the steel pipe diagonal brace is connected with the enclosure structure; the steel pipe diagonal bracing (1) is fixedly connected with the temporary upright post (4);
the hydraulic axial force adjusting system is used for monitoring axial force change in the foundation pit in real time and performing telescopic control on the automatic section (1-1) of the diagonal bracing buttress.
2. The foundation pit diagonal bracing supporting structure with adjustable axial force according to claim 1, wherein: the prefabricated diagonal bracing buttress (2-1) is embedded with a prefabricated connecting piece, and the prefabricated diagonal bracing buttress (2-1) is connected with the steel pipe diagonal bracing (1) and the detachable diagonal pile foundation (2-2) through the prefabricated connecting piece; the detachable inclined pile foundation (2-2) is a precast pile foundation.
3. The foundation pit diagonal bracing supporting structure with adjustable axial force according to claim 1, wherein: a crown beam (10) is arranged at the top of the bored pile (9), a steel backing plate is arranged in the crown beam (10), and the top fixed end of the steel pipe diagonal bracing (1) is connected with the steel backing plate; and pouring the crown beam (10) after the steel backing plate is pre-buried and laid.
4. A foundation pit diagonal bracing supporting structure with adjustable axial force according to claim 3, wherein: the post-pouring belt (12) is arranged on a structural bottom plate (11) of the foundation pit diagonal bracing supporting structure, and the structural bottom plate (11) is connected with the bored pile (9) through a bracing replacing belt.
5. The foundation pit diagonal bracing supporting structure with adjustable axial force according to claim 4, wherein: and concrete slope protection (6) is sprayed on the large slope (5).
6. The foundation pit diagonal bracing supporting structure with adjustable axial force according to claim 5, wherein: the hydraulic axial force adjusting system comprises a pressure sensor for monitoring the axial force change condition in the foundation pit in real time, a hydraulic power station for detecting data in real time and a control system for controlling the hydraulic power station to stretch and retract the automatic section (1-1) of the diagonal bracing buttress according to the detected data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223326995.XU CN219137698U (en) | 2022-12-12 | 2022-12-12 | Foundation pit diagonal bracing supporting structure with adjustable axial force |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223326995.XU CN219137698U (en) | 2022-12-12 | 2022-12-12 | Foundation pit diagonal bracing supporting structure with adjustable axial force |
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|---|---|
| CN219137698U true CN219137698U (en) | 2023-06-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223326995.XU Active CN219137698U (en) | 2022-12-12 | 2022-12-12 | Foundation pit diagonal bracing supporting structure with adjustable axial force |
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| CN (1) | CN219137698U (en) |
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- 2022-12-12 CN CN202223326995.XU patent/CN219137698U/en active Active
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