CN110685288A - Composite anchoring structure for foundation pit or side slope explosion prevention - Google Patents
Composite anchoring structure for foundation pit or side slope explosion prevention Download PDFInfo
- Publication number
- CN110685288A CN110685288A CN201911108471.3A CN201911108471A CN110685288A CN 110685288 A CN110685288 A CN 110685288A CN 201911108471 A CN201911108471 A CN 201911108471A CN 110685288 A CN110685288 A CN 110685288A
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- CN
- China
- Prior art keywords
- grouting
- metal
- foundation pit
- grout
- slope
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
Abstract
A composite anchoring structure for explosion prevention of foundation pit or slope is composed of a grouting hole array consisting of multiple grouting holes arranged obliquely and downward on foundation pit wall or slope, each grouting hole divided into cavity and grouting area by buffer baffle, the cavity is positioned at the bottom of the grouting hole, a metal anchor rod is also arranged in the grouting area of each grouting hole, the metal anchor rods are vertical to the buffer baffle plate, in the grouting area, a cement paste inner core formed by grouting cement paste is arranged from the opening part of the grouting hole to the position of the buffer baffle, the metal anchor rod is embedded in the cement paste inner core, the outer ends of the metal anchor rods extend out of the grouting holes and are connected with the outer end heads of the metal anchor rods through metal pull strips to form a metal net, and a polyurea elastomer layer is coated outside each metal anchor rod extending out of the grouting hole and the metal mesh, and the setting range of the polyurea elastomer layer is larger than the range of the grouting hole array. The structure has good buffering, anti-explosion and energy absorption performances, can effectively protect foundation pits and side slopes, and avoids the condition that the collapse affects peripheral buildings.
Description
Technical Field
The invention belongs to the field of engineering construction, and particularly relates to a composite anchoring structure for foundation pit or side slope explosion prevention.
Background
The foundation pit is a soil pit excavated at the design position of the foundation according to the elevation of the foundation and the plane size of the foundation. Before excavation, an excavation scheme is determined according to geological and hydrological data and the conditions of buildings nearby the site, and waterproof drainage work is performed. The person who is not excavated can use the method of putting the side slope to stabilize the earth slope, and the size of the slope is determined according to the relevant construction regulations. When a deeper foundation pit and a building adjacent to the deeper foundation pit are excavated, a foundation pit wall supporting method, a concrete-sprayed wall protecting method and a large foundation pit are used, and even an underground continuous wall and a columnar column type bored pile are used for interlocking, so that an outer soil layer is prevented from collapsing; for those who have no influence on nearby buildings, the underground water level can be reduced by a well point method, and slope releasing open cut is adopted; in cold areas, natural cold air freezing method can be adopted for excavation and the like.
The side slope is a slope surface with a certain slope and is made on two sides of the roadbed to ensure the stability of the roadbed.
In order to prevent the collapse of the foundation pit wall or the side slope, a protective structure needs to be constructed on the foundation pit wall or the side slope. The protective structure that is more commonly used at present is an anchoring structure. The method specifically comprises the following steps: the method comprises the following steps of drilling an inclined anchor rod on the wall of a foundation pit or a side slope, pouring cement paste around the anchor rod, connecting the end of the anchor rod with a thin steel bar to form a net, and spraying concrete on the surface.
However, the above anchoring structure is weak in anti-explosion performance, in engineering construction, a blasting technology is often used, stratum vibration caused by blasting has a great influence on safety of a foundation pit and a side slope, and a landslide accident is easily caused.
Disclosure of Invention
The invention aims to provide a composite anchoring structure for foundation pit or side slope explosion prevention, which has good buffering, anti-explosion and energy absorption performances, can effectively protect the foundation pit and the side slope, and avoids the condition that the collapse affects the surrounding buildings.
In order to achieve the purpose, the invention adopts the technical scheme that: a composite anchoring structure for explosion prevention of foundation pit or slope is composed of a grouting hole array consisting of multiple grouting holes arranged obliquely and downward on foundation pit wall or slope, each grouting hole divided into cavity and grouting area by buffer baffle, the cavity is positioned at the bottom of the grouting hole, a metal anchor rod is also arranged in the grouting area of each grouting hole, the metal anchor rods are vertical to the buffer baffle plate, in the grouting area, a cement paste inner core formed by grouting cement paste is arranged from the opening part of the grouting hole to the position of the buffer baffle, the metal anchor rod is embedded in the cement paste inner core, the outer ends of the metal anchor rods extend out of the grouting holes and are connected with the outer end heads of the metal anchor rods through metal pull strips to form a metal net, and a polyurea elastomer layer is coated outside each metal anchor rod extending out of the grouting hole and the metal mesh, and the setting range of the polyurea elastomer layer is larger than the range of the grouting hole array.
The metal anchor rod is made of deformed steel bars.
The cavity length is 1/10 of the total length of the grout hole.
The buffer baffle is composed of a hard framework and an elastic layer coated on the surface of the hard framework, and the hard framework is fixedly connected with the metal anchor rod.
The buffer baffle is a foam plate.
The inclined angle of the grouting hole is 15 ~ 30 degrees.
The length of the metal anchor rod extending out of the grouting hole is 10 cm.
The distance between the adjacent grouting holes is 1 meter.
The invention has the beneficial effects that: the invention is a composite structure combining a rigid structure and a three-layer explosion-proof energy-absorbing structure, and has excellent anti-explosion performance and convenient construction. A cavity is reserved at the bottom of a grouting hole, when blasting vibration occurs, air in the cavity can play a certain buffering role, the used buffering baffle plate also has the buffering and energy-absorbing functions, the energy of the blasting vibration can be effectively weakened, and the anti-explosion and energy-absorbing functions of the polyurea elastomer layer formed by external spraying are added to form a three-layer anti-explosion and energy-absorbing structure from outside to inside, so that the vibration influence of blasting on the foundation pit wall and the side slope is greatly weakened. The metal anchor rods in the grouting holes and the metal mesh connected with the metal anchor rods outside the holes form a rigid structure of the composite anchoring structure, and the rigid structure and the three-layer explosion-proof energy-absorbing structure are in rigid-flexible fit, so that effective protection is formed on a foundation pit or a side slope together, and the safety of surrounding buildings or other nearby construction sections is protected.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the connection of the metal anchor rod and the metal pull rod of the present invention;
the labels in the figure are: 1. side slope, 2, grout hole, 3, cavity, 4, buffer stop, 5, grout inner core, 6, metal stock, 7, polyurea elastomer layer, 8, metal brace.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and examples, but the invention is not limited thereto.
Referring to the attached drawings 1 and 2, a composite anchoring structure for explosion protection of a foundation pit or a side slope comprises a grouting hole array, a metal anchor rod 6 and a polyurea elastomer layer 7, wherein the grouting hole array is composed of a plurality of grouting holes 2, the grouting holes 2 are constructed according to specific construction requirements and are generally arranged obliquely downwards, cavities 3 are reserved in the grouting holes 2, when grouting is performed on the grouting holes 2, the grouting holes are blocked by corresponding buffer baffles 4, so that cement paste cannot flow into the cavities 3, the cavities 3 are located at the bottom of the grouting holes 2, the length of the cavities 3 is preferably 1/10 of the total length of the grouting holes 2, other spaces in the grouting holes 2 except the cavities 3 are grouting areas, the total length of the grouting holes 2 is the length of the grouting areas plus the length of the cavities 3, the metal anchor rod 6 is arranged in the grouting areas, the metal anchor rod 6 can be made of thread steel, one end, located in the grouting holes 2, of the metal anchor rod 6 is the inner end of the metal anchor rod 6, the corresponding other end is the outer end of a metal anchor rod 6, the inner end of the metal anchor rod 6 is connected with the buffer baffle 4, or the metal anchor rod 6 is supported on the buffer baffle 4, the outer end of the metal anchor rod 6 extends out of the opening of the grouting hole 2, the grouting area is filled with cement slurry, after the cement slurry is solidified, a cement slurry inner core 5 for fixing the metal anchor rod 6 and the buffer baffle 4 in the grouting hole 2 is formed, the outer ends of the metal anchor rod 6 are connected with each other through a metal brace 8, and form a metal net, the metal anchor rods 6 in the grouting holes 2 are connected into a whole, the metal brace 8 selects a steel bar with the diameter smaller than that of the metal anchor rod 6, the metal brace 8 and the metal anchor rod 6 can be welded or tied by a binding wire, and spraying polyurea outside the formed metal mesh to form a polyurea elastomer layer 7 wrapping the metal mesh and the outer end of the metal anchor rod 6, wherein the area of the polyurea elastomer layer 7 is larger than that of the grouting hole array.
The buffer baffle 4 of the invention can be made of light materials or elastic materials, such as foam plates, or the buffer baffle 4 is composed of a hard framework and an elastic layer, the hard framework plays a role in supporting and separating, the elastic layer is coated on the surface of the hard framework and mainly plays a role in buffering and energy absorption, and the elastic layer can be foam, rubber or sponge and the like.
Polyurea is an elastomeric material formed by the reaction of an isocyanate component and an amino compound component. The most basic properties of polyurea are corrosion protection, water resistance and abrasion resistance. According to the invention, the three-layer explosion-proof energy-absorbing structure from outside to inside is formed by utilizing the anti-explosion property and the impact resistance of polyurea and combining the cavity structure and the buffer baffle structure, so that the collapse accident caused by impact vibration caused by explosion is avoided.
The construction method of the invention comprises the following steps:
firstly, a plurality of grouting holes 2 are arranged on a foundation pit wall or a side slope 1 according to engineering requirements, the axial inclination angle of each grouting hole 2 is 15 ~ 30 degrees, and the distance between every two adjacent grouting holes 2 is 1 meter, so that a grouting hole array is formed;
secondly, inserting the deformed steel serving as the metal anchor rod 6 into the center of the cylindrical foam plate, inserting the deformed steel and the foam plate into the grouting hole 2 together, forming a cavity 3 between the foam plate and the bottom of the grouting hole 2, and controlling the length of the cavity 3 by controlling the length of the outer end of the deformed steel exposed out of the grouting hole 2, wherein the length of the cavity 3 is 1/10 of the total length of the grouting hole 2, so that the length of the deformed steel can be selected to be the same as that of the grouting hole 2, only the length of 1/10 of the deformed steel is required to be exposed out of the grouting hole 2, and the length of the deformed steel extending out of the grouting hole is 10 cm in the embodiment;
thirdly, grouting cement slurry into the grouting holes 2 to form a cement slurry inner core 5 for fixing the deformed steel bars and surrounding soil layers;
fourthly, after the cement paste is solidified, the deformed steel bars exposed out of the grouting holes 2 are sequentially connected by using the steel bars to form a metal net, so that the deformed steel bars of the grouting hole array are connected into a whole;
and fifthly, spraying polyurea on the formed metal mesh to form a polyurea elastomer layer 7, wherein the spraying area is larger than the area of the grouting hole array, the spraying thickness can wrap the metal mesh and the outer end of the deformed steel bar, and after the polyurea is solidified, a composite anchoring structure with three layers of anti-explosion and energy-absorption structures is formed.
Claims (8)
1. The utility model provides an explosion-proof compound anchor structure of using of foundation ditch or side slope which characterized in that: including the grout hole array, the grout hole array comprises a plurality of grout holes (2) of beating downwards and establishing of slope on foundation pit wall or side slope (1), and cavity (3) and grout district are separated into by buffer baffle (4) in every grout hole (2), and cavity (3) are located the bottom of grout hole (2), still are equipped with metal stock (6) in the grout district of every grout hole (2), and metal stock (6) and buffer baffle (4) are perpendicular, and in the grout district, arrive from the oral area of grout hole (2) buffer baffle (4) position is equipped with grout inner core (5) that are formed by the grout that pours into, and metal stock (6) are buried underground in the grout inner core, and grout hole (2) are stretched out to the outer end of metal stock (6) is connected by metal brace (8) to form the metal mesh, stretch out the metal stock (6) of grout hole (2) and the outer cladding polyurea elastomer layer (7) of metal mesh The setting range of the polyurea elastomer layer (7) is larger than the range of the grouting hole array.
2. The composite anchoring structure for foundation pit or slope explosion protection according to claim 1, wherein: the metal anchor rod (6) is made of deformed steel bars.
3. The composite anchoring structure for foundation pit or slope explosion protection according to claim 1, wherein: the length of the cavity (3) accounts for 1/10 of the total length of the grouting hole (2).
4. The composite anchoring structure for foundation pit or slope explosion protection according to claim 1, wherein: the buffer baffle (4) is composed of a hard framework and an elastic layer coated on the surface of the hard framework, and the hard framework is fixedly connected with the metal anchor rod (6).
5. The composite anchoring structure for foundation pit or slope explosion protection according to claim 1, wherein: the buffer baffle (4) is a foam plate.
6. The composite anchoring structure for foundation pit or slope explosion prevention according to claim 1, wherein the inclination angle of the grouting hole (2) is 15 ~ 30 degrees.
7. The composite anchoring structure for foundation pit or slope explosion protection according to claim 1, wherein: the length of the metal anchor rod (6) extending out of the grouting hole (2) is 10 cm.
8. The composite anchoring structure for foundation pit or slope explosion protection according to claim 1, wherein: the distance between the adjacent grouting holes (2) is 1 m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911108471.3A CN110685288A (en) | 2019-11-13 | 2019-11-13 | Composite anchoring structure for foundation pit or side slope explosion prevention |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911108471.3A CN110685288A (en) | 2019-11-13 | 2019-11-13 | Composite anchoring structure for foundation pit or side slope explosion prevention |
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| Publication Number | Publication Date |
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| CN110685288A true CN110685288A (en) | 2020-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911108471.3A Pending CN110685288A (en) | 2019-11-13 | 2019-11-13 | Composite anchoring structure for foundation pit or side slope explosion prevention |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111576449A (en) * | 2020-05-19 | 2020-08-25 | 湖北工业大学 | Tile-based expansive soil slope flexible solid-arranging structure and construction method |
-
2019
- 2019-11-13 CN CN201911108471.3A patent/CN110685288A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111576449A (en) * | 2020-05-19 | 2020-08-25 | 湖北工业大学 | Tile-based expansive soil slope flexible solid-arranging structure and construction method |
| CN111576449B (en) * | 2020-05-19 | 2021-08-10 | 湖北工业大学 | Tile-based expansive soil slope flexible solid-arranging structure and construction method |
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