CN212270962U - Foundation pit supporting and construction road integrated structure - Google Patents
Foundation pit supporting and construction road integrated structure Download PDFInfo
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- CN212270962U CN212270962U CN202020977547.8U CN202020977547U CN212270962U CN 212270962 U CN212270962 U CN 212270962U CN 202020977547 U CN202020977547 U CN 202020977547U CN 212270962 U CN212270962 U CN 212270962U
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Abstract
The utility model discloses a excavation supporting and construction road integral structure, integral structure are that excavation supporting structure forms overall structure with the construction road, and wherein excavation supporting structure is including several steel-pipe piles, and several steel-pipe piles are inserted and are established in the peripheral soil body of foundation ditch, are connected by the structural layer of construction road between the adjacent steel-pipe pile upper portion, and steel-pipe pile upper portion forms overall structure with construction road structural layer. The construction method comprises the following steps: firstly, leveling a field; step two, measuring and paying off; driving the steel pipe pile; step four, sleeving the first sleeve; fifthly, mounting a cover plate and a second sleeve; pouring a construction road structure layer; and step seven, covering the top cover. Has the advantages that: the construction adopts the operation form of 'support-excavation', and the construction period can be effectively saved. The steel pipe pile, the sleeve, the cover plate and the concrete top cover can be detached, are simple to manufacture and convenient to transport, and have no influence on development of adjacent underground spaces.
Description
Technical Field
The utility model relates to a retaining and protecting integrated structure, in particular to retaining and protecting of foundation ditch and construction road integrated structure.
Background
At present, along with the development of economy and the acceleration of urbanization pace, many cities are in the hot tide of real estate investment and municipal infrastructure construction, and underground buildings such as underground shopping malls, underground streets, underground transformer substations, underground parking lots, drainage and sewage treatment systems and the like enable the scale of foundation pit engineering to be increased continuously.
At present, the foundation pit support mainly comprises support forms such as soil nailing walls, underground continuous walls, steel sheet piles, piles-anchors and the like. The soil nailing wall support construction equipment is simple, the construction does not need to occupy a field independently, the construction cost is low, but the bearing capacity is not high, and the soil nailing wall support construction equipment is only used for shallow foundation pit support generally; the underground continuous wall has high bearing capacity, good water interception and seepage prevention performance, but complex construction and high cost; the steel sheet pile is flexible in design and can be recycled, but the construction precision requirement is high, and the pile body is easy to incline and is not easy to correct in the piling process. The pile anchor support has the advantages of strong bearing capacity, no influence of underground water, small occupied space and the like, is widely applied to foundation pit engineering with large-depth excavation and poor soil body conditions, but the overall design of the pile anchor support tends to be conservative and the construction cost is higher. For the existing foundation pit supporting technology, a supporting structure only bears horizontal load. Under the combined action of the soil pressure of the foundation and the construction load, the soil body on the lower portion of one side of the foundation pit of the construction road is easy to loosen and even break away, the road forms a structure similar to a cantilever beam, cracks and even fractures are easy to occur on the construction road, and serious accidents such as side turning of construction vehicles such as a concrete pump truck, failure of a foundation pit supporting structure and the like are induced. When the construction space of the foundation pit is narrow and cannot ensure the safe distance between the vehicle and the side of the pit, accidents of the type occur. In addition, the existing foundation pit supporting mode is 'supporting while excavating', and the construction period is long. Meanwhile, the support forms are difficult to recover except for the steel sheet piles, which becomes an obstacle to the development of the surrounding underground space in the future.
How to guarantee the reliability of the supporting structure and simultaneously take into account the requirements of construction period, construction cost, environmental protection and other aspects, which is exactly the requirement of the current foundation pit engineering on the novel supporting technology.
Disclosure of Invention
The utility model mainly aims to solve the problem of how to ensure the reliability of the supporting structure in the foundation pit engineering with narrow construction space at the pit side;
the utility model also aims to solve the problems that the soil body at the lower part of one side of the foundation pit of the construction road is loosened or even separated due to overlarge horizontal displacement of the foundation pit supporting structure caused by foundation pit excavation and construction road load, the construction road is easy to crack or even break, and severe accidents such as side turning of construction vehicles are induced;
the utility model discloses a solve above-mentioned problem, reach above-mentioned purpose and the excavation supporting and construction road integral structure that provides.
The utility model provides a foundation ditch support and construction road integral structure is that foundation ditch support structure forms overall structure with the construction road, and wherein foundation ditch support structure is including several steel-pipe piles, and several steel-pipe piles are arranged and are inserted and establish in the peripheral soil body of foundation ditch, are connected by the structural layer of construction road between the adjacent steel-pipe pile upper portion, and steel-pipe pile upper portion forms overall structure with construction road structural layer.
The upper portion cover of steel-pipe pile is equipped with first sleeve and second sleeve, and first telescopic top lid is equipped with the apron, and the second sleeve setting is on the top surface of apron, and the telescopic upper end of second is provided with the top cap, and first sleeve, apron, second sleeve and top cap all set up in the structural layer of construction road.
The inner diameters of the first sleeve and the second sleeve are the same, the outer diameter of the second sleeve is larger than that of the first sleeve, the cover plate is made of a steel plate, a round hole with the same outer diameter as that of the steel pipe pile is formed in the middle of the cover plate, and the top cover is formed by prefabricating cement concrete.
The structural layer of the construction road is a cement concrete structure, transverse and longitudinal steel bars are arranged in the cement concrete structure, the transverse and longitudinal steel bars are threaded steel bars, the diameter of the steel bar is not less than 12mm, the distance between the longitudinal steel bars is not more than 350mm, the distance between the transverse steel bars is not more than 600mm, the longitudinal steel bars are arranged in the thickness range of 1/3-1/2 below the top surface of the surface layer, the transverse steel bars are positioned below the longitudinal steel bars, the distance from edge steel bars to free edges is 100-150mm, the maximum grain size of aggregate in the cement concrete is not more than 26.5mm, and the fineness modulus of sand in the cement concrete is not less than.
The utility model provides a foundation ditch support and construction road integral structure and construction method, its method is as follows:
step one, leveling a field: the construction site is leveled, so that the mechanical equipment can smoothly enter and exit the site, and the pile driver can be conveniently put in place;
step two, measurement and paying off: paying off and positioning the position of the steel pipe pile by using a theodolite according to a construction drawing, wherein the positioning error of the steel pipe pile is less than 10mm, protecting the site pile position after rechecking is correct, and starting the next construction;
step three, driving the steel pipe pile:
firstly, moving a pile driver to a pile position, lifting the steel pipe pile to enable the pile top to be sleeved into a pile cap, and before lifting, carrying out detailed appearance inspection on each section of steel pipe pile, particularly paying attention to ovality, meeting the requirement and accurately lifting;
inserting the bottom end of the steel pipe pile to a mark line at the pile position, and monitoring the verticality of the guide rod by using two theodolites in the right front and side surfaces of the pile driver in the right-angle direction to enable the pile hammer, the pile cap and the pile body to form a vertical line;
the steel pipe pile is automatically and gradually sunk into the soil by the dead weight of the steel pipe pile, the pile cap and the pile hammer, and the quality condition of the sunk pile is tracked and observed at any time during the period;
fourthly, after the self-sinking quality of the steel pipe pile is confirmed to be good, normal continuous hammering is carried out until the top end of the steel pipe pile is hammered to be 60-80cm higher than the ground, and hammering is stopped;
fifthly, accurately cutting the steel pipe pile according to the design height;
step four, sleeving the first sleeve: sleeving a first sleeve on the lower part of the part, exposed out of the ground, of the steel pipe pile, and enabling the bottom of the first sleeve to be tightly attached to the ground;
step five, installing a cover plate and a second sleeve: the cover plate penetrates through the steel pipe pile, so that the bottom surface of the cover plate is tightly attached to the top end of the first sleeve, then the second sleeve is sleeved on the steel pipe pile, and the bottom end of the second sleeve is tightly attached to the top surface of the cover plate;
step six, pouring a construction road structure layer: the construction method comprises the following steps of constructing a road with a structural layer of a cement concrete structure, binding steel bars, modeling, pouring the cement concrete, reserving hole sites of a top cover, maintaining and then removing a formwork;
step seven, covering a top cover: and a top cover is covered at the top end of the second sleeve, and the top cover is prefabricated by cement concrete.
And in the second step, the theodolite used for measuring and positioning and the measuring instrument used for controlling the quality detection equipment in the use period carry out measurement detection control according to the secondary measurement standard.
The steel bars in the sixth step are threaded steel bars, the diameter of the steel bars is not less than 12mm, the distance between the longitudinal steel bars is not more than 350mm, the distance between the transverse steel bars is not more than 600mm, the longitudinal steel bars are arranged under the top surface of the surface layer within the thickness range of 1/3-1/2, the transverse steel bars are arranged under the longitudinal steel bars, the distance from the edge steel bars to the free edge is 100-150mm, the maximum grain size of aggregates in the cement concrete is not more than 26.5mm, and the fineness modulus of sand in the cement concrete is not less than 2.5.
The working principle of the utility model is as follows:
the utility model provides a but excavation supporting and construction road integral structure adopts recycled steel-pipe pile supporting construction, comprises steel-pipe pile, first sleeve, apron, second sleeve, cement concrete pavement and the prefabricated top cap of concrete, directly bears road surface load and side direction soil pressure by the steel-pipe pile, and cement concrete pavement then provides the upper portion restraint. Because of the road surface load can turn into horizontal soil pressure effect and act on supporting construction, directly undertake by the steel-pipe pile now, reduced the horizontal soil pressure that acts on supporting construction promptly, great road surface load can be undertaken to the structure to reach the purpose of stabilizing the foundation ditch. When the device works, the road surface load is diffused to the soil around the pile and the deep soil according to the transfer path of the cement concrete road surface → the cover plate → the steel pipe pile; the lateral soil pressure acts on the steel pipe pile and is transmitted to soil mass around the pile by the steel pipe pile so as to balance the lateral soil pressure. The utility model discloses a construction adopts the operation form of "strutting-excavation", and the excavation is strutted before, if do not have special circumstances to need to strut again after the excavation.
The utility model has the advantages that:
the utility model provides a foundation ditch support and construction road integral structure and construction method reliability are high, adopt the steel-pipe pile to directly undertake the vertical load on road surface, full play supporting construction's vertical bearing capacity, the horizontal load of effect also effectively reduces on the foundation ditch supporting construction. The supporting structure directly bears vertical load, the requirement of the periphery of the foundation pit on the construction operation space can be effectively reduced, and particularly the requirement of construction vehicles such as concrete pump trucks on the safe distance from the pit edge is reduced, so that the occurrence of vehicle overturn accidents is avoided. And the construction period is saved. The utility model discloses a construction adopts the operation form of "strutting-excavation", struts before the excavation, and the excavation then can one step target in place, and the operation of contrasting current "excavation limit is strutted" can effectively practice thrift the time limit for a project. Furthermore, the utility model discloses a steel-pipe pile directly squeezes into with the continuous hammering of pile driver, compares in need dig hole slip casting's supporting construction such as soil nailing wall, underground continuous wall, stake-anchor, further practices thrift the time limit for a project. The cost is low. Compared with the underground continuous wall and pile-anchor supporting technology, the utility model discloses a steel-pipe pile need not to dig hole slip casting, and save material and reduce the requirement to construction machinery. Meanwhile, the steel pipe pile can be recycled, the cement concrete pavement can still be used after the foundation pit is backfilled, and the construction cost is effectively reduced. Is ecological and environment-friendly. The steel pipe pile, the sleeve, the cover plate and the concrete top cover used in the utility model can be disassembled, the production is simple, the transportation is convenient, and the steel pipe pile, the sleeve, the cover plate and the concrete top cover can be flexibly assembled on site according to the actual requirements; the steel pipe pile can be recovered after the project is finished, and the development of the adjacent underground space is not influenced.
Drawings
Figure 1 is the utility model discloses a excavation supporting and construction road integral structure overall structure elevation.
Figure 2 is excavation supporting and construction road integral structure overall structure top view.
Fig. 3 is the enlarged structure schematic diagram of a single steel pipe pile.
Fig. 4 is a schematic view of the structure setting sequence of a single steel pipe pile.
Fig. 5 is a top view of the cover plate of the present invention.
Fig. 6 is a schematic view of the steel pipe pile driving state of the present invention.
The labels are as follows:
1. construction road 2, steel-pipe pile 3, foundation ditch 4, first sleeve 5, apron 6, second sleeve 7, top cap 8, pile driver 9, pile cap 10, round hole 11, pile hammer.
Detailed Description
Please refer to fig. 1 to 6:
the utility model provides a excavation supporting and construction road integral structure is that excavation supporting structure forms into overall structure with construction road 1, and wherein excavation supporting structure is including number row steel-pipe pile 2, and number row steel-pipe pile 2 inserts and establishes in the peripheral soil body of foundation ditch 3, is connected by construction road 1's structural layer between 2 upper portions of adjacent steel-pipe pile, and 2 upper portions of steel-pipe pile form into overall structure with construction road 1 structural layer.
The upper portion cover of steel-pipe pile 2 is equipped with first sleeve 4 and second sleeve 6, and the top lid of first sleeve 4 is equipped with apron 5, and second sleeve 6 sets up on the top surface of apron 5, and the upper end of second sleeve 6 is provided with top cap 7, and first sleeve 4, apron 5, second sleeve 6 and top cap 7 all set up in the structural layer of construction road 1.
The inner diameters of the first sleeve 4 and the second sleeve 6 are the same, the outer diameter of the second sleeve 6 is larger than that of the first sleeve 4, the cover plate 5 is made of steel plates, a round hole 10 which is the same as the outer diameter of the steel pipe pile 2 is formed in the middle of the cover plate 5, and the top cover 7 is formed by prefabricating cement concrete.
The structural layer of the construction road 1 is a cement concrete structure, transverse and longitudinal steel bars are arranged in the cement concrete structure, the transverse and longitudinal steel bars are threaded steel bars, the diameter of the steel bar is not less than 12mm, the distance between the longitudinal steel bars is not more than 350mm, the distance between the transverse steel bars is not more than 600mm, the longitudinal steel bars are arranged in the thickness range of 1/3-1/2 below the top surface of the surface layer, the transverse steel bars are positioned below the longitudinal steel bars, the distance from the edge steel bars to the free edge is 100-150mm, the maximum grain size of aggregate in cement concrete is not more than 26.5mm, and the fineness modulus of sand in the cement concrete is not less.
The utility model provides a foundation ditch support and construction road integral structure and construction method, its method is as follows:
step one, leveling a field: the construction site is leveled, so that the mechanical equipment can smoothly enter and exit the site, and the pile driver 8 is convenient to take place;
step two, measurement and paying off: paying off and positioning the position of the steel pipe pile 2 by using a theodolite according to a construction drawing, wherein the positioning error of the steel pipe pile 2 is less than 10mm, protecting the site pile position after rechecking is correct, and starting the next construction;
step three, driving the steel pipe pile 2:
firstly, moving a pile driver 8 to a pile position, lifting a steel pipe pile 2 to enable a pile top to be sleeved into a pile cap 9, and before lifting, carrying out detailed appearance inspection on each steel pipe pile 2, particularly paying attention to ovality, meeting requirements and lifting accurately;
inserting the bottom end of the steel pipe pile 2 to a marking line at a pile position, and monitoring the verticality of a guide rod by using two theodolites in the right front and side surfaces of a pile driver 8 in a right-angle direction to enable a pile hammer 11, a pile cap 9 and a pile body to form a vertical line;
thirdly, the steel pipe pile 2 is automatically and gradually sunk into the soil by the dead weight of the steel pipe pile 2, the pile cap 9 and the pile hammer 11, and the quality condition of the sunk pile is tracked and observed at any time during the period;
fourthly, after confirming that the self-sinking quality of the steel pipe pile 2 is good, carrying out normal continuous hammering until the top end of the steel pipe pile 2 is hammered to be 60-80cm higher than the ground, and stopping hammering;
fifthly, accurately cutting the steel pipe pile 2 according to the design height;
step four, sleeving the first sleeve 4: arranging a first sleeve 4 at the lower part of the part, exposed out of the ground, of the steel pipe pile 2, and enabling the bottom of the first sleeve 4 to be tightly attached to the ground;
step five, installing the cover plate 5 and the second sleeve 6: penetrating the cover plate 6 through the steel pipe pile 2 to enable the bottom surface of the cover plate 6 to be tightly attached to the top end of the first sleeve 4, then sleeving the second sleeve 6 on the steel pipe pile 2, and enabling the bottom end of the second sleeve 6 to be tightly attached to the top surface of the cover plate 5;
step six, pouring a structural layer of the construction road 1: the construction road 1 adopts a cement concrete structure, steel bars are bound firstly, cement concrete is poured in a modeling mode, hole sites of the top cover 7 are reserved, maintenance is carried out, and then the model is removed;
step seven, covering the top cover 7: and a top cover 7 is covered at the top end of the second sleeve 6, and the top cover 7 is prefabricated by cement concrete.
And in the second step, the theodolite used for measuring and positioning and the measuring instrument used for controlling the quality detection equipment in the use period carry out measurement detection control according to the secondary measurement standard.
The steel bars in the sixth step are threaded steel bars, the diameter of the steel bars is not less than 12mm, the distance between the longitudinal steel bars is not more than 350mm, the distance between the transverse steel bars is not more than 600mm, the longitudinal steel bars are arranged under the top surface of the surface layer within the thickness range of 1/3-1/2, the transverse steel bars are arranged under the longitudinal steel bars, the distance from the edge steel bars to the free edge is 100-150mm, the maximum grain size of aggregates in the cement concrete is not more than 26.5mm, and the fineness modulus of sand in the cement concrete is not less than 2.5.
The working principle of the utility model is as follows:
the utility model provides a but excavation supporting and construction road integral structure adopts the 2 supporting construction of recoverable steel-pipe pile, comprises steel-pipe pile 2, first sleeve 4, apron 5, second sleeve 6, cement concrete pavement and precast concrete top cap 7, directly undertakes road surface load and side direction soil pressure by steel-pipe pile 2, and cement concrete pavement then provides the upper portion restraint. Because of the road surface load can turn into horizontal soil pressure and act on supporting construction, directly undertake by steel-pipe pile 2 now, reduced the horizontal soil pressure that acts on supporting construction promptly, great road surface load can be undertaken to the structure to reach the purpose of stabilizing the foundation ditch. When the device works, the road surface load is diffused to the soil around the pile and in the deep layer according to the transmission path of the cement concrete road surface → the cover plate 5 → the steel pipe pile 2; the lateral soil pressure acts on the steel pipe pile 2 and is transmitted to the soil body around the pile by the steel pipe pile 2 so as to balance the lateral soil pressure. The utility model discloses a construction adopts the operation form of "strutting-excavation", and the excavation is strutted before, if do not have special circumstances to need to strut again after the excavation.
Claims (4)
1. The utility model provides a excavation supporting and construction road integral structure which characterized in that: the foundation pit supporting structure and the construction road form an integral structure, wherein the foundation pit supporting structure comprises a plurality of rows of steel pipe piles, the plurality of rows of steel pipe piles are inserted into soil bodies around a foundation pit, the upper parts of the adjacent steel pipe piles are connected through a structural layer of the construction road, and the upper parts of the steel pipe piles and the structural layer of the construction road form the integral structure.
2. The integrated structure of foundation pit support and construction road of claim 1, wherein: the upper portion cover of steel-pipe pile be equipped with first sleeve and second sleeve, first telescopic top lid is equipped with the apron, the second sleeve sets up on the top surface of apron, the telescopic upper end of second is provided with the top cap, first sleeve, apron, second sleeve and top cap all set up in the structural layer of construction road.
3. The integrated structure of foundation pit support and construction road of claim 2, wherein: the inner diameters of the first sleeve and the second sleeve are the same, the outer diameter of the second sleeve is larger than that of the first sleeve, the cover plate is made of a steel plate, a round hole with the same outer diameter as that of the steel pipe pile is formed in the middle of the cover plate, and the top cover is formed by prefabricating cement concrete.
4. The integrated structure of foundation pit support and construction road of claim 1, wherein: the structural layer of the construction road is a cement concrete structure, transverse and longitudinal steel bars are arranged in the cement concrete structure, the transverse and longitudinal steel bars are threaded steel bars, the diameter of the steel bar is not less than 12mm, the distance between the longitudinal steel bars is not more than 350mm, the distance between the transverse steel bars is not more than 600mm, the longitudinal steel bars are arranged in the thickness range of 1/3-1/2 below the top surface of the surface layer, the transverse steel bars are positioned below the longitudinal steel bars, the distance from the edge steel bars to the free edge is 100-150mm, the maximum grain size of aggregate in cement concrete is not more than 26.5mm, and the fineness modulus of sand in the cement concrete is not less than 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020977547.8U CN212270962U (en) | 2020-06-02 | 2020-06-02 | Foundation pit supporting and construction road integrated structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020977547.8U CN212270962U (en) | 2020-06-02 | 2020-06-02 | Foundation pit supporting and construction road integrated structure |
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| Publication Number | Publication Date |
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| CN212270962U true CN212270962U (en) | 2021-01-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020977547.8U Active CN212270962U (en) | 2020-06-02 | 2020-06-02 | Foundation pit supporting and construction road integrated structure |
Country Status (1)
| Country | Link |
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| CN (1) | CN212270962U (en) |
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2020
- 2020-06-02 CN CN202020977547.8U patent/CN212270962U/en active Active
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