CN111576497B - Construction method of anti-floating anchor rod applied to underground space - Google Patents
Construction method of anti-floating anchor rod applied to underground space Download PDFInfo
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- CN111576497B CN111576497B CN202010414229.5A CN202010414229A CN111576497B CN 111576497 B CN111576497 B CN 111576497B CN 202010414229 A CN202010414229 A CN 202010414229A CN 111576497 B CN111576497 B CN 111576497B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/10—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against soil pressure or hydraulic pressure
- E02D31/12—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against soil pressure or hydraulic pressure against upward hydraulic pressure
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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
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Abstract
The invention relates to a construction method of an anti-floating anchor rod applied to an underground space, which is applied to the field of anti-floating anchor rod construction and comprises the following steps: step S1, setting a construction base surface; step S2, binding steel bars of a first layer of bottom plate on a construction base surface to form a first layer of steel bar frame, arranging two reference angle irons with opposite bending directions at anchor rod position points in the binding process, fixedly welding the first layer of steel bar frame and the two reference angle irons, clamping an anchor rod positioning piece between the two reference angle irons, and realizing the pre-embedding of the anchor rod positioning piece on the first layer of steel bar frame; step S3, pouring concrete into a first floor slab; step S4, a vertical anchor hole is arranged at the anchor rod setting point through a drilling machine, the anchor hole vertically crosses the first floor, the construction base surface and the soil layer, and the anchor hole vertically penetrates through the anchor rod positioning piece; and step S5, inserting the anchor rod into the anchor hole, performing grouting construction and arranging an end anchorage device. The anti-floating anchor rod fixing device has the effects of accurate anti-floating anchor rod arrangement position and high construction quality.
Description
Technical Field
The invention relates to the technical field of anti-floating anchor rod construction, in particular to a construction method of an anti-floating anchor rod applied to an underground space.
Background
The anti-floating anchor rod is one of the anti-floating measures for underground structure in building engineering and is one structural member to resist the upward shift of the building. The reverse construction refers to the construction of a high-rise building underground structure layer by layer from top to bottom, namely, a vertical bearing system containing an anti-floating anchor rod is built at a basement of a building, then a layer of earthwork is dug from top to bottom, a basement beam plate structure is poured by an earth mould, the construction of a single-layer underground space is completed, and the construction of the next-layer underground space is the same. The construction period of the anti-floating anchor rod can be effectively shortened through reverse construction of the anti-floating anchor rod, the ground structure and the underground structure can be conveniently constructed layer by layer at the same time, the building construction efficiency is effectively improved, and the anti-floating anchor rod is particularly suitable for construction in a low-clearance underground space.
The invention discloses a construction method of an anti-floating anchor rod, which is disclosed in the prior invention patent document with the publication number of CN104674809B, wherein an anchor rod sleeve is placed at a preset position of the anti-floating anchor rod on the surface of a soil layer, a cushion layer, a waterproof layer and a concrete bottom plate of a foundation bottom plate are sequentially constructed on the surface of a coating layer, the top end of the anchor rod sleeve extends upwards to the upper surface of the concrete bottom plate, a high-pressure rotary jet drilling machine is used for penetrating the anchor rod sleeve above the foundation bottom plate and drilling a hole in the soil layer, meanwhile, a high-pressure rotary jet mixture is formed by grouting in the hole, an anchor rod main rib is inserted in the hole before the high-pressure rotary jet mixture is solidified, a high-pressure rotary jet solidified body is formed after the high-pressure rotary jet mixture is solidified, and the top end of the anchor rod main rib extends upwards to the upper part of the foundation bottom plate.
The foundation slab is constructed firstly, and then the anti-floating anchor rod is constructed, so that the construction process of the anti-floating anchor rod can be synchronously carried out with the construction of the main structure above the foundation slab, and the whole construction period is effectively shortened through the reverse construction of the anti-floating anchor rod.
The above prior art solutions have the following drawbacks: when the concrete bottom plate is poured, the stress contraction of the concrete leads the concrete to draw the anchoring sleeve rod, so that the verticality of the axial lead of the anchoring sleeve rod is changed, and the verticality error is generated. And the straightness that hangs down of anchor loop bar axial lead directly influences the straightness that hangs down that the stock set up, and the slope of stock can make the bearing capacity of the vertical bearing system of underground space reduce for the quality of underground space construction reduces.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the construction method of the anti-floating anchor rod applied to the underground space, which has the effects of accurate setting position of the anti-floating anchor rod and high construction quality.
The above object of the present invention is achieved by the following technical solutions: a construction method of an anti-floating anchor rod applied to an underground space comprises the following steps:
step S1, setting a construction base surface;
step S2, binding steel bars of a first layer of bottom plate on a construction base surface to form a first layer of steel bar frame, arranging two reference angle irons with opposite bending directions at anchor rod position points in the binding process, fixedly welding the first layer of steel bar frame and the two reference angle irons, clamping an anchor rod positioning piece between the two reference angle irons, and realizing the pre-embedding of the anchor rod positioning piece on the first layer of steel bar frame;
step S3, pouring concrete into a first floor slab;
step S4, a vertical anchor hole is arranged at the anchor rod setting point through a drilling machine, the anchor hole vertically crosses the first floor, the construction base surface and the soil layer, and the anchor hole vertically penetrates through the anchor rod positioning piece;
and step S5, inserting the anchor rod into the anchor hole, performing grouting construction and arranging an end anchorage device.
Through adopting above-mentioned technical scheme, through stock setting element location stock, prevent the stock setting element through benchmark angle bar and shift because of the traction force of concrete shrinkage, the precision that stock and anchor eye set up is difficult for reducing because the stock setting element squints, and construction quality is high and it is convenient to confirm that stock setting element, anchor eye and stock hang down straightness.
The invention is further configured to: in step S2, the reference angle iron is fitted to the anchor rod positioning member by interference fit.
Through adopting above-mentioned technical scheme, benchmark angle bar and stock setting element interference gomphosis can make the spacing power conduction of benchmark angle bar more stable, and the stock setting element sets up stability better.
The invention is further configured to: in step S2, placing anchor rod positioning pieces and reference angle irons in comparison with anchor rod position points, laying bottom-layer longitudinal steel bars of the first-layer steel bar frame, and spot-welding and positioning the reference angle irons and the bottom-layer longitudinal steel bars of the first-layer steel bar frame;
laying bottom-layer transverse steel bars of the first-layer steel bar frame, binding the bottom-layer transverse steel bars and the bottom-layer longitudinal steel bars of the first-layer steel bar frame, checking the verticality of the anchor rod positioning piece, adjusting the position of the reference angle iron, and positioning the transverse steel bars and the reference angle iron of the bottom-layer first-layer steel bar frame in a spot welding mode;
and then carrying out gluten binding construction on the first layer of steel bar frames to form the first layer of steel bar frames, checking the verticality of the anchor rod positioning piece, and welding and reinforcing the first layer of steel bar frames and the reference angle iron.
By adopting the technical scheme, the process of welding and fixing the reference angle iron is split into a multi-point welding and repeated verticality checking combined process, the fine adjustment of the positions of the reference angle iron and the anchor rod positioning piece is convenient, the position accuracy of the reference angle iron and the anchor rod positioning piece is higher, and the construction quality is better.
The invention is further configured to: the method also comprises the following steps of,
step S6, waterproof reinforcement is carried out on the anchoring point where the anchor rod is located;
step S7, binding the steel bars of the second layer of bottom plate to form a second layer of steel bar frame;
and step S8, pouring concrete into the second floor.
Through adopting above-mentioned technical scheme, the bottom plate layering is pour the degree of difficulty that effectively reduces concrete placement, saves time limit for a project effectual, and waterproof reinforcement makes difficult the seepage ponding that appears between second floor bottom plate and the first floor bottom plate, the shrink when the concrete of second floor bottom plate solidifies
The anchor rod does not directly act on the top end of the anchor rod and an end anchorage device, and the construction quality is high.
The invention is further configured to: in step S6, the top end of the anchor rod, the end anchorage device, the reference angle iron and the anchor rod positioning piece are encapsulated by micro-expansion concrete, after the micro-expansion concrete is completely dried, waterproof paint is coated on the surface of the micro-expansion concrete encapsulation, and after the waterproof paint is completely dried, the waterproof reinforcing work is finished.
Through adopting above-mentioned technical scheme, the shrink when the micro-expansion concrete accessible inflation is resisted the concrete and is solidified, is difficult for appearing the crack when encapsulating, and reinforcing effect and leakproofness are all splendid, and waterproof coating reinforcing leakproofness, the anchor rod setting stability is effectively strengthened to the two combined action, and reduces the possibility that seepage ponding appears between first floor bottom plate and the second floor bottom plate.
The invention is further configured to: in step S6, before the micro-expansion concrete is used for encapsulation, self-repairing concrete is used for encapsulating the seam between the anchor rod positioning piece and the reference angle iron.
By adopting the technical scheme, the self-repairing concrete and the micro-expansion concrete act together to realize the encapsulation effect, and the micro-expansion concrete can be automatically repaired when cracks and water seepage occur due to the action of stress during encapsulation, so that the construction structure has stronger stability.
The invention is further configured to: the anchor rod positioning piece is made of an air-entraining block and is arranged in a cube.
By adopting the technical scheme, the aerated block is small in density, high in compressive strength and easy to machine, the situation of position deviation caused by overlarge initial cutting difficulty is not easy to occur during drilling of the anchor hole, and the anchor hole is convenient to position.
The invention is further configured to: the heights of the first floor bottom plate, the reference angle iron and the anchor rod positioning piece are sequentially increased in an increasing mode.
By adopting the technical scheme, the anchor rod positioning piece and the reference angle iron are exposed out of the first layer bottom plate, so that the verticality of the anchor rod positioning piece and the reference angle iron can be checked conveniently, the top surface of the anchor rod positioning piece is not easy to remain concrete which influences the positioning and setting of an anchor hole when the concrete for pouring is vibrated so as to be uniform, and the construction is convenient.
The invention is further configured to: the height difference between the anchor rod positioning piece and the first layer of bottom plate and the height ratio of the second layer of bottom plate are 1: 3.
through adopting above-mentioned technical scheme, the stock setting element exposes in the high ratio direct influence stock and the combination height of second floor bottom plate of the height of first floor bottom plate part and second floor bottom plate, influence the stress conduction between stock and the bottom plate, influence the stability of construction structures, the fixed stability of stock and second floor bottom plate is not good then to the high ratio undersize, the speed of stock stress conduction to second floor bottom plate top surface is too fast then to the high ratio oversize, influence the setting stability and the use experience of second floor bottom plate, above-mentioned proportion is the preferred proportion of balancing above-mentioned circumstances.
The invention is further configured to: the height ratio of the first layer of bottom plate to the second layer of bottom plate is 3: 2.
by adopting the technical scheme, the height ratio of the first layer bottom plate and the second layer bottom plate directly influences the construction period of batch casting and the setting accuracy of the anchor rod positioning piece, if the height ratio is too large, the traction force of concrete shrinkage on the anchor rod positioning piece is increased, if the height ratio is too small, the construction period of batch casting is unbalanced and the casting difficulty is increased, and the ratio is a better ratio for balancing the situations.
In conclusion, the beneficial technical effects of the invention are as follows:
1. the anchor rod positioning piece is prevented from deviating due to traction force of concrete shrinkage by welding and fixing the reference angle iron and the first layer of reinforcing steel frame, the accuracy of fixing the anchor rod positioning piece is high, the accuracy of setting the anchor hole and the anchor rod is high, and the construction quality is high;
2. the construction difficulty of the bottom plate is reduced by pouring the bottom plate in batches, the bottom plate and the anchor rod are conveniently constructed together, and the construction period is shortened;
3. the encapsulation structure with the waterproof and reinforcing effects, which is formed by the self-repairing concrete, the waterproof coating and the expansive concrete, effectively reduces the possibility of seeper leakage between the first layer of bottom plate and the second layer of bottom plate.
Drawings
FIG. 1 is a cross-sectional view of an embodiment directed to the internal structure of an anchor eye.
FIG. 2 is a schematic diagram of a reference angle of an embodiment.
In the drawings, 1, an anchor rod; 11. an end anchorage device; 2. constructing a base surface; 21. a soil layer; 3. a first floor pan; 31. a first layer of steel bar frames; 4. a second floor slab; 41. a second layer of steel bar frames; 5. an anchor rod positioning member; 51. a reference angle bar; 6. a micro-expansive concrete layer; 61. a waterproof coating layer; 62. self-repairing the concrete layer; 7. and (4) an anchor hole.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, the construction structure of an anti-floating anchor rod applied to an underground space disclosed by the invention comprises a second floor 4, a first floor 3, a construction base 2 and a soil layer 21 which are sequentially arranged from top to bottom. The second floor 4 and the first floor 3 are made of concrete by casting in batches, and the second layer of steel bar frame 41 and the first layer of steel bar frame 31 are embedded inside, and the first layer of steel bar frame 31 and the second layer of steel bar frame 41 are both truss structures. An anchor rod positioning piece 5 is pre-embedded in the first layer bottom plate 3, an anchor hole 7 vertically penetrates through the anchor rod positioning piece 5, and the anchor hole 7 vertically penetrates through the construction base surface 2 and extends into the soil layer 21. The anchor rod 1 is positioned in the center of the anchor hole 7, and a large amount of concrete is poured between the anchor rod 1 and the anchor hole 7. An end anchorage device 11 is fixedly arranged at the top of the anchor rod 1, and the top of the anchor rod 1, the end anchorage device 11 and the top of the anchor rod positioning piece 5 are all embedded in the second floor bottom plate 4.
Referring to fig. 1 and 2, the anchor positioning member 5 is a cube made of an air-entraining block material, the cube is horizontally arranged on the construction base surface 2, and a reference angle iron 51 is clamped on the periphery of the cube. The number of the reference angle pieces 51 is two, and the reference angle pieces are respectively engaged with two corners opposing each other on a diagonal line of the cube by interference. The reference angle iron 51 is fixed with the first layer reinforcing frame 31 by multi-spot welding, the bottom end of the reference angle iron 51, the bottom end of the anchor rod positioning piece 5 and the construction base surface 2 are flush, and the heights of the first layer bottom plate 3, the reference angle iron 51 and the anchor rod positioning piece 5 are sequentially increased. The height ratio of the anchor rod positioning piece 5 to the first layer bottom plate 3 to the second layer bottom plate 4 is 11:9:6, the height difference between the reference angle iron 51 and the anchor rod positioning piece 5 is 3 cm, and the reference angle iron 51 is reinforced.
Referring to fig. 1, the top end of the anchor rod 1 is coated with a micro-expansion concrete layer 6, a waterproof coating layer 61 and a self-repairing concrete layer 62, the self-repairing concrete layer 62 covers the joint of the datum angle iron 51 and the anchor rod positioning piece 5, the micro-expansion concrete coating layer covers the self-repairing concrete layer 62, the datum angle iron 51, the anchor rod positioning piece 5, the end anchorage device 11 and the top end of the anchor rod 1, and the waterproof coating layer 61 covers the micro-expansion concrete layer 6.
The gas-adding block is small in density, high in compressive strength and easy to machine, the situation that the position is deviated due to overlarge initial cutting difficulty is not prone to occurring when the anchor hole 7 is drilled, the anchor rod positioning piece 5 can be exposed out of the first layer bottom plate 3 to conveniently position the position where the drilling machine is arranged, and the anchor hole 7 is convenient to machine and high in machining precision. Benchmark angle bar 51 reinforcing stock setting element 5 rigidity's stability provides the bigger spacing support of area of contact for stock setting element 5 simultaneously, can't pull stock setting element 5 to the skew of stock setting element 5 during the concrete shrinkage, and stock 1 location precision is high. Self repair concrete layer 62, little expanded concrete layer 6 and waterproof coating layer 61 seal anchor rod 1 top, anchor rod setting element 5 and benchmark angle bar 51's seam crossing jointly, and the anchor rod 1 sets up strong and difficult seepage ponding that appears between second floor bottom plate 4 and the first floor bottom plate 3 of stability.
The roughening treatment increases the contact area between the self-repairing concrete layer 62 and the micro-expansion concrete layer 6, increases the contact area between the micro-expansion concrete layer 6 and the concrete of the second bottom plate 4, and ensures that the fixation stability among all parts forming the structure is good. The bottom plate is poured in layers, so that the arrangement of the anchor rod 1 and the arrangement of the bottom plate can be synchronously carried out, the construction period is shortened, and the safety quality of the structure construction is not influenced. The anchor rod 1 fixing piece, the height ratio of first floor bottom plate 3 and second floor bottom plate 4 directly influences the length of the easy processing section of anchor eye 7 and accounts for the ratio, the anchor rod setting element 5 and the fixed height of second floor bottom plate 4 and first floor bottom plate 3, the anchor rod 1 is connected the degree of depth and the pouring time limit for a project with the bottom plate, and then influence the anchor rod setting element 5 and the stability of being connected of first floor bottom plate 3 and second floor bottom plate 4, influence the setting stability of anchor rod 1 and bottom plate, influence the efficiency of construction, the preferred proportion between above-mentioned proportion for balancing each key element.
The construction process of the construction structure comprises the following steps:
step S1, the soil layer 21 is leveled, the construction base surface 2 is arranged on the top surface of the soil layer 21, and the step S2 is carried out after the levelness of the construction base surface 2 is checked to be qualified.
Step S2, placing a plurality of anchor rod positioning pieces 5 and a plurality of groups of reference angle irons 51 in comparison with the anchor rod 1 position points, further laying the bottom longitudinal steel bars of the first layer of steel bar frame 31, abutting the reference angle irons 51 with the bottom longitudinal steel bars of the first layer of steel bar frame 31, and positioning the reference angle irons 51 and the bottom longitudinal steel bars of the first layer of steel bar frame 31 by spot welding;
laying bottom-layer transverse steel bars of the first-layer steel bar frame 31, binding and fixing the bottom-layer transverse steel bars and bottom-layer longitudinal steel bars of the first-layer steel bar frame 31, clamping the anchor rod positioning piece 5 and the corresponding reference angle iron 51 on the bottom-layer steel bars of the first-layer steel bar frame 31, checking the verticality of the anchor rod positioning piece 5 through verticality detection equipment such as a vertical instrument, adjusting the position of the reference angle iron 51 according to the checking result, and positioning the transverse steel bars and the reference angle iron 51 of the bottom-layer first-layer steel bar frame 31 in a spot welding manner;
and then the gluten of the first layer of steel bar frame 31 is bound to form the first layer of steel bar frame 31, the verticality of the anchor rod positioning piece 5 and the embedding state of the reference angle iron 51 and the anchor rod positioning piece 5 are checked again, the position of the reference angle iron 51 is finely adjusted according to the checking result, then the first layer of steel bar frame 31 and the reference angle iron 51 are welded and reinforced, and at the moment, the reference angle iron 51 and the anchor rod positioning piece 5 are in interference embedding.
Step S3, a concrete pouring formwork is disposed on the periphery of the first layer of steel frames 31, and then concrete is poured into the first layer of steel frames 31, the poured concrete is uniform and leveled, the concrete is solidified to form the first layer of bottom plate 3, and the concrete pouring of the first layer of bottom plate 3 is completed, in this embodiment, the pouring height is 6000 mm, and at this time, the reference angle iron 51 and the top end of the anchor positioning piece 5 are both located above the first layer of bottom plate 3.
Step S4, a vertical anchor hole 7 is arranged at the setting point of the anchor rod 1 through the modified drilling machine with lower total height, the reference plane of the drilling machine is the first floor 3, the anchor hole 7 vertically stretches across the first floor 3, the construction base surface 2 and the soil layer 21, the anchor hole 7 vertically penetrates through the anchor rod positioning piece 5, and the inner diameter of the anchor hole 7 is not smaller than 25 mm.
Step S5, vertically inserting the anchor rod 1 welded with the bracket in advance into the anchor hole 7, grouting under the assistance of common auxiliary devices such as a grouting pipe and the like, smearing plain cement slurry on the top end of the anchor rod 1 outside the first floor 3, wherein the top end of the anchor rod 1 is not easy to be corroded, and then fixedly connecting an end anchorage device 11 on the top end of the anchor rod 1.
Step S6, coating self-repairing concrete on the joint of the anchor rod positioning piece 5 and the reference angle iron 51, and after the self-repairing concrete is completely solidified, wrapping the self-repairing concrete layer 62 at the joint of the anchor rod positioning piece 5 and the reference angle iron 51; the outer surface of the chiseling self-repairing concrete is coated with micro-expansion concrete to encapsulate the top end of the anchor rod 1, the end anchorage 11, the reference angle iron 51 and the anchor rod positioning piece 5, and after the micro-expansion concrete is completely dried, the micro-expansion concrete layer 6 is finished; and (3) roughening the outer surface of the micro-expansion concrete layer 6, further coating waterproof coating on the micro-expansion concrete encapsulation surface, and finishing the waterproof coating layer 61 after the waterproof coating is completely dried, so that the waterproof reinforcing work of the anchoring point where the anchor rod 1 is located is finished. The combination degree of each part that constitutes waterproof reinforced structure is higher for the processing of chisel hair, and waterproof reinforced effect is better.
Step S7, tie the steel bars of the second floor 4 to form the second layer of steel bar frame 41.
Step S8, a concrete pouring formwork is disposed on the periphery of the second layer of steel bar frame 41, and then concrete is poured into the second layer of steel bar frame 41, the poured concrete is uniform and leveled, the concrete is solidified and formed to form a second layer of bottom plate 4, the concrete pouring of the second layer of bottom plate 4 is completed, the pouring height in this embodiment is 4000 mm, and the second layer of bottom plate 4 completely covers the top end of the anchor rod 1 and the waterproof coating 61.
Can realize the reverse construction of anti-floating anchor rod 1 in low headroom underground space through above-mentioned operation, fix a position anchor rod setting element 5 through reference angle bar 51, fix a position anchor hole 7 and stock 1 through anchor rod setting element 5, reference angle bar 51 and first layer steel reinforcement frame 31 welded fastening make anchor rod setting element 5 be difficult for taking place the skew because of the traction force of concrete shrinkage in the concrete setting process, and then the precision that stock 1 and anchor hole 7 set up is high, the stable quality of construction structures.
The first floor 3 and the second floor 4 form the floor together, pouring in batches is easier to construct, the anchor rod 1 is fixed more stably with the gomphosis of floor, the floor and anchor rod 1 are constructed synchronously, and the effect of saving the time limit for a project is good. After the reference angle iron 51 is positioned by spot welding, the perpendicularity of the reference angle iron 51 and the anchor rod positioning piece 5 is checked for many times, the position of the reference angle iron 51 is fixed by fine adjustment and multi-spot welding, the precision of the positions of the reference angle iron 51, the anchor rod positioning piece 5, the anchor hole 7 and the anchor rod 1 is high, the construction steps are strong in implementability, and construction is convenient.
The implementation principle of the embodiment is as follows: firstly, setting a construction base surface 2; then binding a first layer of reinforcement frame 31 on the construction base surface 2, arranging two datum angle irons 51 with opposite bending directions at the position points of the anchor rod 1 in the binding process, welding and fixing the first layer of reinforcement frame 31 and the two datum angle irons 51, clamping an anchor rod positioning piece 5 between the two datum angle irons 51, pouring concrete into the first layer of base plate 3, drilling a drill hole vertically crossing the first layer of base plate 3, the construction base surface 2 and the soil layer 21 through a drilling machine, inserting the anchor rod 1 into the anchor hole 7, performing grouting construction and arranging an end anchorage device 11, performing waterproof reinforcement on the anchoring point where the anchor rod 1 is located, binding a second layer of reinforcement frame 41, pouring concrete into the second layer of base plate 4, and completing the reverse construction of the anti-floating anchor rod 1;
the bottom plate is pour in layers and the bottom plate is in step with the construction of stock 1, saves the time limit for a project, and stock 1 fixes a position under the assistance of stock setting element 5, and stock setting element 5 and benchmark angle bar 51 interference gomphosis just are difficult for the displacement because of benchmark angle bar 51 and first layer reinforcing steel frame 31 welded fastening, and the location precision of anchor eye 7 and stock 1 is high, and the stability of construction structure is high.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (7)
1. A construction method of an anti-floating anchor rod applied to an underground space is characterized by comprising the following steps:
step S1, setting a construction base surface (2);
step S2, binding reinforcing steel bars of a first layer of bottom plate (3) on a construction base surface (2), and when a first layer of reinforcing steel bar frame (31) is formed, firstly placing an anchor bar positioning piece (5) and reference angle iron (51) according to the position point of an anchor bar (1), laying bottom layer longitudinal reinforcing steel bars of the first layer of reinforcing steel bar frame (31), arranging two reference angle iron (51) with opposite bending directions at the position point of the anchor bar (1), spot-welding the reference angle iron (51) and the bottom layer longitudinal reinforcing steel bars of the first layer of reinforcing steel bar frame (31), clamping the anchor bar positioning piece (5) between the two reference angle iron (51), and realizing the pre-embedding of the anchor bar positioning piece (5) on the first layer of reinforcing steel bar frame (31);
paving bottom transverse steel bars of the first layer of steel bar frames (31), binding the bottom transverse steel bars and the bottom longitudinal steel bars of the first layer of steel bar frames (31), checking the verticality of the anchor rod positioning piece (5), adjusting the position of the reference angle iron (51) and positioning the transverse steel bars and the reference angle iron (51) of the bottom first layer of steel bar frames (31) in a spot welding mode;
then performing gluten binding construction on the first layer of the reinforcing frames (31) to form the first layer of the reinforcing frames (31), checking the verticality of the anchor rod positioning piece (5), and finally welding and fixing the whole first layer of the reinforcing frames (31) and the two reference angle irons (51);
step S3, pouring concrete into the first floor (3);
step S4, arranging a vertical anchor hole (7) at the anchor rod (1) setting point through a drilling machine, wherein the anchor hole (7) vertically crosses the first floor (3), the construction base (2) and the soil layer (21), and the anchor hole (7) vertically penetrates through the anchor rod positioning piece (5);
step S5, inserting the anchor rod (1) into the anchor hole (7), grouting and setting an end anchor (11);
the method also comprises the following steps of,
step S6, performing waterproof reinforcement on the anchoring point where the anchor rod (1) is located, adopting micro-expansion concrete to encapsulate the top end of the anchor rod (1), the end anchorage device (11), the reference angle iron (51) and the anchor rod positioning piece (5), after the micro-expansion concrete is completely dried, coating waterproof paint on the surface of the micro-expansion concrete encapsulation, and after the waterproof paint is completely dried, finishing the waterproof reinforcement work;
step S7, binding the steel bars of the second layer of bottom plate (4) to form a second layer of steel bar frame (41);
and step S8, pouring concrete into the second floor (4).
2. The construction method of the anti-floating anchor rod applied to the underground space according to claim 1, wherein: in step S2, the reference angle (51) is fitted into the anchor positioning member (5) by interference fit.
3. The construction method of the anti-floating anchor rod applied to the underground space according to claim 2, wherein: in step S6, before the micro-expansion concrete is used for encapsulation, self-repairing concrete is used for encapsulating the seam between the anchor rod positioning piece (5) and the reference angle iron (51).
4. A construction method of an anti-floating anchor rod applied to an underground space according to any one of claims 1 to 3, wherein: the anchor rod positioning piece (5) is made of an air-adding block, and the anchor rod positioning piece (5) is arranged in a cube shape.
5. The construction method of the anti-floating anchor rod applied to the underground space according to claim 4, wherein: the heights of the first floor bottom plate (3), the reference angle iron (51) and the anchor rod positioning piece (5) are sequentially increased.
6. The construction method of the anti-floating anchor rod applied to the underground space according to claim 5, wherein: the height difference between the anchor rod positioning piece (5) and the first layer bottom plate (3) and the height ratio of the second layer bottom plate (4) are 1: 3.
7. the construction method of the anti-floating anchor rod applied to the underground space according to claim 6, wherein: the height ratio of the first layer of bottom plate (3) to the second layer of bottom plate (4) is 3: 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010414229.5A CN111576497B (en) | 2020-05-15 | 2020-05-15 | Construction method of anti-floating anchor rod applied to underground space |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010414229.5A CN111576497B (en) | 2020-05-15 | 2020-05-15 | Construction method of anti-floating anchor rod applied to underground space |
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| CN111576497A CN111576497A (en) | 2020-08-25 |
| CN111576497B true CN111576497B (en) | 2021-07-23 |
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| CN202010414229.5A Active CN111576497B (en) | 2020-05-15 | 2020-05-15 | Construction method of anti-floating anchor rod applied to underground space |
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| JP3823243B2 (en) * | 1999-05-21 | 2006-09-20 | 株式会社竹中工務店 | Lifting damping mechanism of pile foundation |
| CN103774663B (en) * | 2014-02-19 | 2015-10-07 | 深圳大学建筑设计研究院 | The water proof structure of basement anti-floating dowel and construction method |
| CN105756059B (en) * | 2016-04-29 | 2017-11-03 | 武汉建工集团股份有限公司 | A kind of rear anchor formula anti-float anchor rod and construction method |
| CN109706901B (en) * | 2019-01-24 | 2024-01-23 | 中国建筑第八工程局有限公司 | Anti-floating structure of large-diameter steel pipe in foundation slab and construction method thereof |
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