CN114319312A - Peripheral foundation shock-absorbing structure during blasting - Google Patents
Peripheral foundation shock-absorbing structure during blasting Download PDFInfo
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- CN114319312A CN114319312A CN202210123968.8A CN202210123968A CN114319312A CN 114319312 A CN114319312 A CN 114319312A CN 202210123968 A CN202210123968 A CN 202210123968A CN 114319312 A CN114319312 A CN 114319312A
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Abstract
The invention discloses a peripheral foundation shock absorption structure during blasting, wherein at least two rows of shock absorption steel sheet piles are arranged between an explosive source and a protected building, the shock absorption steel sheet piles are arranged on a concentric circle taking the explosive source as the center of a circle and are arranged at intervals, and the extension line of the included angle between the edge of the steel sheet pile closest to the explosive source and the explosive source covers the protected building; the invention has the advantages that: because the side bag is adopted, the pressure of the side soil to the steel sheet pile can be judged according to the pressure of water in the side bag; the side bag also buffers vibration, and can adjust the water pressure in the side bag according to specific conditions, thereby adjusting the buffering force.
Description
Technical Field
The invention relates to the technical field of buildings, in particular to a construction method of a steel sheet pile.
Background
Along with the rapid development and the rise of various high-rise buildings, the development and the application of deep foundation pit supporting technology are promoted, a steel sheet pile supporting structure is popularized and applied in engineering, the steel sheet pile supporting structure has the advantages of light weight, tight lock catch, high strength, simplicity in construction, high construction speed, good environment-friendly effect, high safety performance, low requirement on space, soil and water retaining effect and the like, becomes one of the enclosure measures of foundation pit supporting engineering of bridges, buildings and the like, and is widely applied to engineering buildings such as retaining walls, wharfs, bridge cofferdams and the like.
The conditions of pressure, vibration and the like of the soil on the side surface to the steel sheet pile need to be considered during the construction of the steel sheet pile, and particularly, the side pressure on the steel sheet pile needs to be detected in real time under some special conditions such as river bank protection and flood control, and the influence of the side vibration on the steel sheet pile is also avoided as much as possible. However, the existing steel sheet pile cannot realize the functions.
In addition, in the construction engineering, especially in the urban construction process, the old large public buildings are often required to be demolished by blasting, and due to the high building density of the city, the surrounding buildings need to be effectively protected during blasting to prevent the influence of blasting operation. Along with the development and application of supporting technology, the steel sheet pile supporting structure is popularized and applied in engineering, has the advantages of simplicity and easiness in construction, high construction speed, high safety performance, low requirement on space, soil and water retaining effect and the like, and becomes one of the first-choice enclosure measures for bridge and building construction.
In the prior art, a protection and isolation device with a certain thickness, such as a common steel sheet pile, is generally arranged between a blasting source and a protected building. And because the common steel sheet pile has no shock absorption effect and only plays a certain role of isolation and enclosure, the shock absorption effect is poor.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a steel sheet pile construction method capable of measuring side pressure and absorbing shock and a peripheral foundation shock absorption structure applied to blasting, and the specific technical scheme is as follows:
a peripheral foundation shock absorption structure during blasting is characterized in that at least two rows of shock absorption steel sheet piles are arranged between an explosive source and a protected building, the shock absorption steel sheet piles are arranged on a concentric circle with the explosive source as the center of a circle and are arranged at intervals, and the extension line of the included angle between the edge of the steel sheet pile closest to the explosive source and the explosive source covers the protected building;
the structure of shock attenuation steel sheet pile does: a wedge-shaped angle is arranged at the lower part of the steel plate tightly attached to the clay layer, the wedge-shaped angle is provided with a first groove and a second groove, the steel plate is embedded into the first groove, the side bag is embedded into the second groove, a pressing plate is arranged outside the side bag, and the lower part of the pressing plate is also embedded into the second groove; holes corresponding to the positions of the steel plate, the side bags and the pressing plate are arranged, and the compression bolts penetrate through the through holes and are screwed on the steel plate; a water inlet and a water outlet are arranged above the side bag, and a pressure gauge is arranged on a pipeline of the water inlet or the water outlet; the upper part of the steel plate is provided with a lifting lug;
the construction method of the damping steel sheet pile comprises a piling step and a pulling step of the steel sheet pile, and is characterized in that:
the piling step is as follows: embedding a steel plate into the first groove of the wedge-shaped angle, then embedding the side bag and the pressing plate into the second groove, then pressing down the steel sheet pile, and after the steel sheet pile is pressed down to the proper position, filling water into the side bag through a water inlet and a water outlet on the upper part of the side bag and adjusting the pressure so as to ensure the damping effect; the pressure on the side surface of the steel sheet pile can be judged through a pressure gauge connected with the side bag; the mode of firstly pressing and then watering ensures that the side bag is not excessively raised to be sheared and damaged by the soil on the side surface when the steel sheet pile is pressed down, and the raised arrangement of the pressing plate on the surface of the side bag also plays a role in protection;
the pulling-out step is as follows: the pressing plate is pulled out firstly, then water is pressurized and fed into the side bag, the gap after the pressing plate is pulled out is filled after the side bag expands, pressure is applied to the side bag of the foundation pit, then water in the side bag is drained, the side bag contracts, and then the steel plate is pulled out.
Before the steel sheet pile is pressed downwards, the pin shaft penetrates through the through hole of the wedge-shaped angle and the through hole of the side pocket, and the steel sheet, the side pocket and the wedge-shaped angle are integrated.
The width of the side pocket after water inflow and expansion is larger than that of the wedge angle.
The side bags are arranged in parallel on the inner side and the outer side of the steel plate.
The wedge angle sets up the locking through-hole, side bag and clamp plate also set up the through-hole that corresponds with the locking through-hole, and the through-hole of clamp plate is below open-ended through-hole, and the pin passes the through-hole of locking through-hole and side bag and clamp plate.
The steel sheet piles are 3 groups, are respectively arranged on a concentric circle with an explosion source as a circle center and are arranged at intervals.
The first row of shock-absorbing steel sheet piles close to the explosive source are closed steel sheet piles.
The closed steel sheet pile is an oval closed damping steel sheet pile.
The invention has the advantages that: because the side bag is adopted, the pressure of the side soil to the steel sheet pile can be judged according to the pressure of water in the side bag; the side bag also buffers vibration, and can adjust the water pressure in the side bag according to specific conditions, thereby adjusting the buffering force. The steel sheet pile structure is convenient to press and recover during construction.
The steel sheet pile combination with the bags on the two sides has the working characteristics of the damper, and can effectively dissipate kinetic energy caused by stratum impact caused by blasting operation and building collapse; the three rows of steel sheet piles are arranged to perform attenuation at a seismic source, perform targeted interception in a propagation path and uniformly dissipate at the tail end to avoid stress concentration; the safety of dismantling the building surrounding in the blasting operation is effectively ensured. The side bag is also convenient for pressing and recycling during the construction of the steel sheet pile.
Drawings
FIG. 1 is a flow chart of a construction process of a shock-absorbing steel sheet pile;
FIG. 2 is a schematic structural view of a shock-absorbing steel sheet pile;
FIG. 3 is a right side view of FIG. 2;
FIG. 4 is a top view of FIG. 2;
FIG. 5 is an enlarged schematic view of a wedge angle;
FIG. 6 is a schematic view of a shock-absorbing structure of a peripheral foundation when the shock-absorbing steel sheet pile is applied to blasting;
FIG. 7 is a schematic view of an oval closed shock-absorbing steel sheet pile;
FIG. 8 is a schematic cross-sectional view taken at the location A-A of FIG. 7;
FIG. 9 is a side view of FIG. 8;
FIG. 10 is a flow chart of a construction process of a shock-absorbing structure of a surrounding foundation applied to blasting.
Detailed Description
The invention is described in detail below with reference to the accompanying drawings, as shown in the drawings, a wedge-shaped angle 4 is arranged at the lower part of a steel plate 1 of a shock-absorbing steel plate pile, which is attached to a clay layer 6, the wedge-shaped angle 4 is provided with a first groove 41 and a second groove 42, the steel plate 1 is embedded into the first groove 41, a side pocket 2 is embedded into the second groove 42, a pressing plate 3 is arranged outside the side pocket 2, and the lower part of the pressing plate is also embedded into the second groove 42;
in order to ensure that the lateral position of the side bag is fixed, holes corresponding to the positions of the steel plate 1, the side bag 2 and the pressing plate 3 are arranged, and the through hole of the side bag 2 is provided with a closed side surface to prevent leakage; the pressing bolt 5 penetrates through the through hole and is screwed on the steel plate, preferably, a concave hole is formed in the pressing plate, and the pressing bolt is a countersunk bolt, so that the surface of the pressing plate 3 is not provided with a bulge, and the resistance in pressing is reduced conveniently; and a water inlet, a water outlet and lifting lugs are arranged above the side bags. The water inlet and/or the water outlet are/is provided with a pressure gauge, and the pressure applied to the side surface of the steel plate can be judged according to the value of the pressure gauge. The lifting lugs are arranged to facilitate the disassembly and assembly of the side bags.
Preferably, the side bags are arranged on the outer side of the steel plate in parallel. The arrangement can adjust the lateral shock absorption according to the actual situation, and reduces the cost.
In order to ensure the integrity, the wedge-shaped angle 4 is provided with a locking through hole 43, the side bag and the pressing plate are also provided with through holes corresponding to the locking through hole, and the lower part of the through hole of the pressing plate is provided with an opening, so that the pressing plate can be conveniently pulled out when being pulled out; and the pin 7 penetrates through the locking through hole, the side pocket and the through hole of the pressing plate to fix the wedge-shaped angle, the steel plate and the side pocket into a whole.
The lower end 44 of the wedge angle is triangular, and the sharp angle a is 30-45 degrees.
The steel plate is one of a U-shaped, a Z-shaped, a linear type and a cap type, when the steel plate pile is combined, a side bag and a pressing plate are arranged at a seam, and the edge of the guard plate 3 covers the root of the seam;
the construction method of the invention is shown in figure 1, and comprises the steps of leveling a construction site, measuring and setting out lines and arranging a guide frame; assembling the steel sheet piles, the side bags and the pressing plates; butt-jointing the steel sheet pile clamping grooves; sequentially pressing the steel sheet piles with the side bags to a designed depth; pulling out the pressing plate; injecting pressure liquid into the side bag and simultaneously exhausting air in the side bag; installing a pressure gauge; the numerical value of the pressure gauge is regularly observed during construction, the construction is carried out layer by layer according to the procedure if the numerical value is normal, and the pressure of liquid in the side bag is adjusted to locally strengthen the inner support if the numerical value is abnormal; and after the construction in the field is finished, pumping out the pressure liquid in the side bag, and pulling out the steel sheet pile with the side bag.
The construction method of the invention adopts the damping steel sheet pile with the side bag, and is characterized in that: the piling step, namely the sequential pressing of the steel sheet piles with the side bags to the designed depth, is as follows: embedding a steel plate into the first groove of the wedge-shaped angle, then embedding the side bag and the pressing plate into the second groove, then pressing down the steel sheet pile, and after the steel sheet pile is pressed down to the proper position, filling water into the side bag through a water inlet and a water outlet on the upper part of the side bag and adjusting the pressure so as to ensure the damping effect; the pressure on the side surface of the steel sheet pile can be judged through a pressure gauge connected with the side bag; the mode of firstly pressing and then watering ensures that the side bag is not excessively raised to be sheared and damaged by the soil on the side surface when the steel sheet pile is pressed down, and the raised arrangement of the pressing plate on the surface of the side bag also plays a role in protection;
the pulling-out step, namely pulling out the steel sheet pile with the side pocket, comprises the following steps: the pressing plate is pulled out firstly, then water is pressurized and fed into the side bag, the gap after the pressing plate is pulled out is filled after the side bag expands, pressure is applied to the side bag of the foundation pit, then water in the side bag is drained, the side bag contracts, and then the steel plate is pulled out.
Before the steel sheet pile is pressed downwards, the steel sheet, the side bags and the wedge-shaped angle are integrated into a whole by utilizing the pin shaft to penetrate through the through hole of the wedge-shaped angle, the through hole of the side bag and the through hole of the lower opening of the pressing plate, so that the whole is conveniently formed during pressing downwards, and the pressing plate is not influenced to be firstly pulled out during pulling out;
preferably, the width of the side bladder after water is inflated is larger than the width of the wedge angle, wherein the width refers to the horizontal width of the side bladder and the wedge angle.
In the invention, the side bag not only has the function of measuring pressure, but also has the function of slowing down vibration, and plays a key role in the step of pulling out, and the principle is as follows:
the width of the bottom is steel plate 1+ side bag 2+ pressing plate 3 → after the pressing plate 3 is pulled out, the width of the bottom is left: the steel plate 1+ the side bag 2 → the expansion of the side bag 2 → the retaining process → the contraction of the side bag 2 → the pile pulling is carried out by utilizing the gap caused by the volume difference between the expansion and the contraction of the side bag;
in the present invention, any one of a hammering method, a vibration method and a static pressure method may be used for pressing down the steel sheet pile in the piling step.
When the shock absorption structure is applied to a peripheral foundation shock absorption structure during blasting, as shown in fig. 6, at least two rows of shock absorption steel sheet piles 10, 3 rows in this embodiment, or 2 rows, 4 rows and the like according to circumstances, are arranged between an explosive source 30 and a protected building 20, the shock absorption steel sheet piles 10 are arranged on a concentric circle with the explosive source as a circle center, and are arranged at intervals along a radial direction, and an extension line of an included angle b between an edge of the steel sheet pile closest to the explosive source and the explosive source covers the protected building;
another structure of the damping steel sheet pile is shown in fig. 8 and 9 and is a damping structure with double-sided side pockets, a wedge-shaped angle 4 is arranged at the lower part of a steel sheet of the steel sheet pile, which is tightly attached to a clay layer, the wedge-shaped angle 4 is provided with a groove, a steel sheet 1 is embedded into the groove, and the two sides of the steel sheet 1 are both provided with the side pockets 2; a pressing plate 3 is arranged outside the side bag 2, and the lower part of the pressing plate and the lower end of the side bag 2 are also embedded into the groove;
in order to ensure that the lateral position of the side bag is fixed, holes corresponding to the positions of the steel plate 1, the side bag 2 and the pressing plate 3 are arranged, and the through hole of the side bag 2 is provided with a closed side surface to prevent leakage; the pressing bolt 5 penetrates through the through hole and is screwed on the steel plate, preferably, a concave edge is arranged on the pressing plate through hole, and the pressing bolt is a countersunk bolt, so that the surface of the pressing plate 3 is not provided with a bulge, and the resistance in pressing is reduced conveniently; a water inlet and a water outlet are arranged above the side bag; the pressure gauge is arranged at the water outlet and/or the water inlet, and the pressure borne by the side surface of the steel plate can be judged according to the value of the pressure gauge. And a lifting lug is arranged above the steel plate.
Preferably, the side bags are arranged on the outer side of the steel plate in parallel. The arrangement can adjust the lateral shock absorption according to the actual situation, and reduces the cost.
In order to ensure the integrity, the wedge-shaped angle 4 is provided with a locking through hole 43, the side bag and the pressing plate are also provided with through holes corresponding to the locking through hole, and the lower part of the through hole of the pressing plate is provided with an opening, so that the pressing plate can be conveniently and independently pulled out when pulled out; and the pin 7 penetrates through the locking through hole, the side pocket and the through hole of the pressing plate to fix the wedge-shaped angle 4, the steel plate 1 and the side pocket 2 into a whole.
The lower end 44 of the wedge angle is triangular, and the sharp angle a is 30-45 degrees.
The construction process flow of the invention is shown in fig. 10, including but not limited to:
firstly: estimating the mass of a demolished building, measuring related material parameters through a stratum sampling experiment, estimating a blasting collapse projection plane of the building, determining the position of the building around blasting operation, and determining the position of a reconstructed land block of the blasting operation; further determining the reasonable length of the damping steel sheet pile; determining the position of a shock-absorbing steel sheet pile of a blasting source; determining the positions of the protective damping steel sheet piles of the peripheral buildings; determining the position of the oval closed damping steel sheet pile on the outer side; then sequentially appointing an enclosure scheme of the on-site damping steel sheet piles, driving the damping steel sheet piles to the design depth of the enclosure scheme, and sequentially connecting and fixing the damping steel sheet piles with the previous middle steel sheet pile; pulling out an outer side protection plate of the damping steel sheet pile, and injecting damping liquid into a side bag (an auxiliary bag) attached to the damping steel sheet pile; then blasting and dismantling operation is carried out on old buildings, and finally the damping steel sheet piles are pulled out.
In order to better buffer the vibration, the first row of shock-absorbing steel sheet piles close to the explosion source are closed steel sheet piles. Preferably, as shown in fig. 7, the closed steel sheet pile is an oval closed shock-absorbing steel sheet pile.
Claims (8)
1. The utility model provides a peripheral basis shock-absorbing structure during blasting which characterized in that: arranging at least two rows of damping steel sheet piles between an explosive source and a protected building, wherein the damping steel sheet piles are arranged on a concentric circle taking the explosive source as the center of a circle and are arranged at intervals, and the extension line of the included angle between the edge of the steel sheet pile closest to the explosive source and the explosive source covers the protected building;
the structure of shock attenuation steel sheet pile does: a wedge-shaped angle is arranged at the lower part of the steel plate tightly attached to the clay layer, the wedge-shaped angle is provided with a first groove and a second groove, the steel plate is embedded into the first groove, the side bag is embedded into the second groove, a pressing plate is arranged outside the side bag, and the lower part of the pressing plate is also embedded into the second groove; holes corresponding to the positions of the steel plate, the side bags and the pressing plate are arranged, and the compression bolts penetrate through the through holes and are screwed on the steel plate; a water inlet and a water outlet are arranged above the side bag, and a pressure gauge is arranged on a pipeline of the water inlet or the water outlet; the upper part of the steel plate is provided with a lifting lug;
the construction method of the damping steel sheet pile comprises a piling step and a pulling step of the steel sheet pile, and is characterized in that:
the piling step is as follows: embedding a steel plate into the first groove of the wedge-shaped angle, then embedding the side bag and the pressing plate into the second groove, then pressing down the steel sheet pile, and after the steel sheet pile is pressed down to the proper position, filling water into the side bag through a water inlet and a water outlet on the upper part of the side bag and adjusting the pressure so as to ensure the damping effect; judging the pressure on the side surface of the steel sheet pile through a pressure gauge connected with the side bag;
the pulling-out step is as follows: the pressing plate is pulled out firstly, then water is pressurized and fed into the side bag, the gap after the pressing plate is pulled out is filled after the side bag expands, pressure is applied to the side bag of the foundation pit, then water in the side bag is drained, the side bag contracts, and then the steel plate is pulled out.
2. The shock absorbing structure of a peri-explosive foundation as set forth in claim 1, wherein: before the steel sheet pile is pressed downwards, the pin shaft penetrates through the through hole of the wedge-shaped angle and the through hole of the side pocket, and the steel sheet, the side pocket and the wedge-shaped angle are integrated.
3. The shock absorbing structure of a peri-explosive foundation as set forth in claim 1, wherein: the width of the side pocket after water inflow and expansion is larger than that of the wedge angle.
4. The shock absorbing structure of a peri-explosive foundation as set forth in claim 1, wherein: the side bags are arranged in parallel on the inner side and the outer side of the steel plate.
5. The shock absorbing structure of a peri-explosive foundation as set forth in claim 1, wherein: the wedge angle sets up the locking through-hole, side bag and clamp plate also set up the through-hole that corresponds with the locking through-hole, and the through-hole of clamp plate is below open-ended through-hole, and the pin passes the through-hole of locking through-hole and side bag and clamp plate.
6. The shock absorbing structure of a peri-explosive foundation as set forth in claim 1, wherein: the steel sheet piles are 3 groups, are respectively arranged on a concentric circle with an explosion source as a circle center and are arranged at intervals.
7. The shock absorbing structure of a peri-explosive foundation as set forth in claim 1, wherein: the first row of shock-absorbing steel sheet piles close to the explosive source are closed steel sheet piles.
8. The shock absorbing structure of a peri-explosive foundation as set forth in claim 1, wherein: the closed steel sheet pile is an oval closed damping steel sheet pile.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210123968.8A CN114319312A (en) | 2022-02-10 | 2022-02-10 | Peripheral foundation shock-absorbing structure during blasting |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210123968.8A CN114319312A (en) | 2022-02-10 | 2022-02-10 | Peripheral foundation shock-absorbing structure during blasting |
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| CN114319312A true CN114319312A (en) | 2022-04-12 |
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| CN202210123968.8A Pending CN114319312A (en) | 2022-02-10 | 2022-02-10 | Peripheral foundation shock-absorbing structure during blasting |
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2022
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