CN211773818U - Prestressed concrete annular foundation and external prestressed reinforcement structure thereof - Google Patents
Prestressed concrete annular foundation and external prestressed reinforcement structure thereof Download PDFInfo
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- CN211773818U CN211773818U CN201921850554.5U CN201921850554U CN211773818U CN 211773818 U CN211773818 U CN 211773818U CN 201921850554 U CN201921850554 U CN 201921850554U CN 211773818 U CN211773818 U CN 211773818U
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Abstract
The utility model provides a prestressed concrete annular basis and external prestressing tendons structure thereof, external prestressing tendons structure is equipped with three-layer protective structure: the waterproof and anticorrosive filling layer is arranged between the inner core and the inner sheath, and the outer sleeve is sleeved on the periphery of the inner sheath. The utility model adopts the external prestressed tendon structure to carry out the post-prestressed tensioning treatment on the concrete annular foundation buried in the soil, thereby greatly reducing the size of the foundation and the material consumption; the outer casing pipe prevents the external prestressed tendons and the inner sheath thereof from being damaged by soil pressure, moisture in the soil and corrosive components; the construction mode of sectional construction, post tensioning and final slurry filling is adopted, so that the construction operation is simplified, and the construction quality is ensured.
Description
Technical Field
The utility model belongs to the technical field of building engineering, concretely relates to prestressed concrete annular basis and external prestressing tendons structure thereof.
Background
The annular foundation buried in the soil is mainly used for resisting pulling and pressure by the larger foundation surface around the annular foundation and the side friction resistance of the surrounding soil body. The gravity type foundation effectively utilizes the structural characteristics of soil, and the load form of the upper part of the annular foundation is offset by the gravity type foundation in an isolated manner to be changed into the integral action of the foundation and the soil. In order to meet the requirement of huge bending moment load transmitted from the upper part of the foundation to the foundation, the existing annular foundation generally adopts the mode of increasing the area and the volume of the foundation or deeper burying or increasing the using amount of reinforcing steel bars, so that the construction complexity and the construction cost are increased to a certain extent.
The prestressed concrete structure is characterized by that before the structure is loaded, a pressure is applied to it in advance, so that when the structure is under the action of external load, the internal force of concrete in the tension zone can produce compressive stress to counteract or reduce the tensile stress produced by external load so as to make the structure do not produce crack or crack late under the condition of normal use. The external and internal prestressed structures have the fundamental difference in structural construction that the prestressed tendons of the external prestressed structure are located outside the concrete structure. For concrete foundations buried in soil, the external prestressed tendons are exposed in the soil, and the external prestressed tendons in the soil need to be protected due to the fact that the external prestressed tendons are easily damaged by soil pressure, water and corrosive components in the soil in the long-term use process. For the annular foundation buried in the soil, due to the above problems of the external prestressed tendons, the application of the external prestressed tendons in the annular foundation in the soil is rarely reported at present.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problem, the utility model provides an external prestressing tendons structure, this prestressing tendons structure can reduce moisture in the soil and the influence of corrosivity composition to its intensity and durability.
The utility model discloses a solve the technical scheme that above-mentioned technical problem adopted and be:
an external prestressing tendons structure, for the radial post-tensioning of a concrete annular foundation (2), comprising:
an inner core (11) as a tendon;
the inner layer sheath (12) is sleeved on the periphery of the inner core (11);
the outer layer sleeve (13) is sleeved on the periphery of the inner layer sheath (12);
the waterproof and anticorrosive filling layer (14) is arranged between the inner core and the inner layer sheath (12);
the two ends of the inner layer sheath (12) are symmetrically embedded in a foundation main body (21) of the concrete annular foundation (2), the outer layer sleeve (13) is flexibly connected to the inner side of the foundation main body (21), and the inner core (11) is symmetrically anchored on the periphery of the foundation main body (21).
In the external prestressed tendon structure, the inner core (11) is a steel strand, the inner sheath (12) is an HDPE pipe, the outer sleeve (13) is a seamless steel pipe, and the waterproof and anticorrosive filling layer (14) is waterproof and anticorrosive cement slurry.
Among the above-mentioned external prestressing tendons structure, the installation region that basis main part (21) were predetermine is the interval and is equipped with a plurality of reservation sheaths (23) in pairs, should reserve sheath (23) and for being used for wearing to establish the pre-buried HDPE pipe of steel strand wires, and each pre-buried HDPE pipe of basis main part (21) inboard is the interval all around and has buried many embedded bars (22), and embedded bar (22) one end is buried in basis main part (21), and the other end stretches out basis main part (21) inboard for welding seamless steel pipe.
Among the above-mentioned external prestressing tendons structure, the degree of depth that embedded steel bar (22) bury the basis main part is no less than 800mm, and the length that embedded steel bar (22) stretched out basis main part (21) is no less than 450 mm.
In the external prestressed tendon structure, the embedded steel bars (22) are welded on the outer surface of the seamless steel pipe, the welding length is not less than 150mm, and the distance from the end part of the seamless steel pipe to the inner peripheral edge of the foundation main body (21) is 50-200 mm.
The invention also provides a prestressed concrete annular foundation which comprises a foundation main body (21) and is characterized in that a plurality of the external prestressed tendon structures (1) are arranged in the radial direction of the foundation main body (21) at intervals, and steel strands of the external prestressed tendon structures (1) are symmetrically anchored on the periphery of the foundation main body (21) through anchoring ends (15); an annular prestressed tendon is embedded in the area, close to the periphery, of the foundation main body (21) of the concrete annular foundation (2).
In the prestressed concrete annular foundation, a tubular anchor cylinder (25) is embedded in the periphery of an embedded HDPE (high-density polyethylene) pipe of a foundation main body (21), a spiral rib (26) is sleeved on the periphery of the tubular anchor cylinder (25), the periphery of the embedded HDPE pipe is embedded and connected with the inner side wall of the tubular anchor cylinder (25), the end face of the tubular anchor cylinder (25) is located on the periphery of the foundation main body (21), and an anchoring end (15) is fixed on the tubular anchor cylinder (25).
In the prestressed concrete annular foundation, the tubular anchor cylinder (25) is a horn-shaped cavity with the diameter gradually reduced from outside to inside, the tubular anchor cylinder and the embedded HDPE pipe are coaxially arranged, the inner side wall of the horn-shaped cavity is connected with the embedded HDPE pipe in an embedded mode, and the end portion of the embedded HDPE pipe is located at the horn mouth of the tubular anchor cylinder; the end face of the tubular anchor cylinder (25) is provided with a grouting opening (251), the inner cylinder body is provided with a channel (252) for communicating the grouting opening (251) with the inner cavity of the tubular anchor cylinder, and the grouting opening (251) is exposed at the periphery of the base main body (21).
In the above-mentioned prestressed concrete annular foundation, anchor end (15) are including work anchor slab (151), work clamping piece (152) and no shrink cement mortar seal anchor (153), work anchor slab (151) closely laminates and is connected together with cast anchor section of thick bamboo (25), be equipped with the bell mouth that corresponds with the steel wire number of steel strand wires on it, work clamping piece (152) are semi-open toper structure, the bell mouth and work clamping piece (152) of work anchor slab (151) are passed to the steel wire of steel strand wires, work clamping piece (152) and the bell mouth cooperation of work anchor slab (151), no shrink cement mortar seal anchor (153) with work anchor slab (151), work clamping piece (152) and the steel strand wires anchor after the stretch-draw in the periphery of basic main part (21).
In the annular foundation of the prestressed concrete, the lower part and two side part areas of the seamless steel pipe of the external prestressed tendon structure (1) are filled with RDC concrete.
Design more than adopting, the utility model discloses an external prestressing tendons structure carries out the post-prestressing force tension to the concrete annular foundation of burying underground in soil and handles, and reasonable utilization the characteristic that concrete "the pressurized does not receive and draws", makes basic concrete be in compression state always, saves a large amount of reinforcing bar quantity that are used for preventing the concrete and draw the usefulness simultaneously for basic size and material quantity reduce by a wide margin. The external prestressed tendon structure is provided with a waterproof and anticorrosive filling layer, an HDPE (high-density polyethylene) pipe and an external casing pipe (preferably a seamless steel pipe) three-layer protection structure from inside to outside, and the external casing pipe also plays a role in preventing soil pressure and the like from damaging the external prestressed tendon and the HDPE pipe in the backfilling process and the use process of the concrete annular foundation.
Drawings
FIG. 1 is a top plan view of one embodiment of the prestressed concrete ring foundation of the present invention;
FIG. 2 is a schematic view taken along line A-A of FIG. 1;
FIG. 3 is a partial cross-sectional view of area B of FIG. 2;
FIG. 4 is a schematic view of a partial structure of the prestressed concrete annular foundation of the present invention;
figure 5 is a schematic view of a supporting structure for RDC concrete backfill.
The reference numerals are represented as:
01-prestressed concrete annular foundation;
1-an external prestressed tendon structure, 11-an inner core and 12-an inner layer sheath; 13-outer sleeve, 14-waterproof anticorrosive filling layer, 15-anchoring end, 151-working anchor plate, 152-working clamping piece and 153-non-shrinkage cement mortar sealing anchor;
2-concrete annular foundation, 21-foundation main body, 22-embedded steel bar, 23-reserved sheath, 25-tubular anchor cylinder, 251-grouting opening and 252-channel; 26-a spiral rib;
3-supporting structure, 31-wood formwork and 32-steel bracket;
4-bottom surface of foundation pit; 5-RDC concrete; 6-ground; 7-silo wall, 71-silo door.
Detailed Description
The external prestressed tendons in the existing concrete foundation, particularly the external prestressed tendons applied to the concrete foundation buried in the soil, are exposed in the soil and are easily damaged by moisture and corrosive components in the soil, so that the strength and the durability of the prestressed tendons are influenced. In order to solve the problem, the utility model provides a prestressed concrete annular foundation and external prestressing tendons structure thereof, this external prestressing tendons structure includes three-layer protective structure: the outer sleeve also plays a role in preventing soil pressure, moisture in soil and corrosive components in the soil from easily damaging the external prestressed tendon and the inner sheath thereof in the backfilling process and the use process of the concrete annular foundation; the construction method of sectional construction, post tensioning and final slurry filling is adopted, so that the construction operation is simplified, and the construction quality is ensured.
The following description will be made in detail with reference to the accompanying drawings and examples of the present invention for a prestressed concrete annular foundation and an external prestressed tendon structure thereof.
The utility model discloses an external prestressing tendons structure carries out the post-tensioning of prestressing force to the concrete annular basis of burying underground in soil, and reasonable utilization the characteristic that concrete "the pressurized is not drawn", makes basic concrete be in compression state always, has eliminated the radial pulling force effect of concrete annular basis, saves a large amount of reinforcing bars quantity that are used for preventing concrete and are drawn usefulness simultaneously for basic size and material quantity reduce by a wide margin.
The prestressed concrete annular foundation and the external prestressed reinforcement structure thereof of the present invention will be described below by taking the annular foundation of a silo as an example.
Figure 1 is a schematic top view of a silo annular foundation provided with external prestressing tendons. As shown in fig. 1, the prestressed concrete annular foundation 01 includes a concrete annular foundation 2 and an external prestressed tendon structure 1 radially arranged on the concrete annular foundation 2, wherein:
referring to fig. 1 and 3, the concrete annular foundation 2 comprises a foundation main body 21, the width and the volume of the foundation main body 21 are determined by the weight of a silo loaded by the foundation main body, the capacity of the silo, the stress condition and other factors, for the silo annular foundation shown in fig. 1, a silo wall 7 is axially supported and installed on the foundation main body 21, a plurality of silo doors 71 are arranged on the silo wall 7 at intervals, and materials in the silo are loaded from top to bottom and are transported out from the silo doors 71. In this embodiment, the area of the silo wall 7 without the silo door 71 is subjected to a large radial tensile stress applied by the materials in the silo, and further the tensile stress transmitted to the corresponding area of the foundation main body 21 is also large, and the layout of the external prestressed tendons of the annular foundation is designed in advance on the basis of analyzing the stress of the concrete annular foundation 2. In the utility model, the area of the basic main body 21 corresponding to the silo wall 7 without the silo door 71 is provided with a plurality of reserved sheaths 23 in pairs at intervals for sleeving the inner core 11 of the external prestressed tendon structure 1; and a plurality of embedded steel bars 22 are embedded around the reserved sheath 23 on the inner side of the foundation main body 21 at intervals, one end of each embedded steel bar 22 is embedded into the foundation main body 21, and the other end of each embedded steel bar 22 extends out of the foundation main body 21 and is used for welding the outer casing 13 (for example, a seamless steel pipe) of the external prestressed reinforcement structure 1.
In one embodiment, twelve embedded bars 22 are embedded around each reserved sheath 23 at equal intervals, the embedded bars 22 are embedded into the foundation main body 21 to a depth of not less than 800mm, and the length of the embedded bars 22 extending out of the foundation main body 21 is not less than 450 mm.
In one embodiment, in order to offset the tensile stress applied to the whole concrete annular foundation 2, the area of the foundation main body 21 close to the periphery is provided with an annular prestressed tendon, and the annular prestressed tendon belongs to an internal prestressed tendon and is formed by embedding when the annular foundation is poured. Because the annular foundation is stressed unevenly, the region of the foundation main body 21 corresponding to the silo wall 7 without the silo door 71 is stressed greatly, in order to enhance the reliability and durability of the annular foundation and prolong the service life, the radial tensile stress generated in the region of the annular foundation needs to be further compensated, the material and cost are increased and the structure is heavier by the traditional method of increasing the thickness and the volume of the annular foundation, increasing the ground beam and increasing the using amount of reinforcing steel bars, and the problem of larger radial tensile force of the annular foundation is effectively solved by adopting the external prestressed tendon structure 1 under the condition of not increasing the material and the structure volume.
Referring to fig. 3 and 5, the external tendon structure 1 of the present invention includes an inner core 11, an inner sheath 12 and an outer sleeve 13 from inside to outside, wherein there are redundant spaces between the inner walls of the inner core 11 and the inner sheath 12 and between the outer wall of the inner sheath 12 and the inner wall of the outer sleeve 13, and the space between the inner core 11 and the inner sheath 12 is filled with a waterproof and anti-corrosive filling layer 14. In one embodiment, the inner core 11 is a steel strand, the inner sheath 12 is a HDPE pipe, the outer sleeve 13 is a seamless steel pipe, the waterproof and anticorrosive filling layer 14 is a cement grouting material, the cement grouting material can be a commonly used waterproof and anticorrosive cement grouting material, and the preferable cement grouting material has the following ratio: 100kG of cement, 36-40L of water and 400g of SIKA additive (a cement additive of Cika, namely a preservative).
For illustration, the inner core 11 is a steel strand, the inner sheath 12 is a HDPE pipe, and the outer sleeve 13 is a seamless steel pipe, and it is obvious that the structure implementation of the external prestressed tendon structure 1 is not limited to this embodiment, and structures and materials with similar functions and performances can be used in this concept to achieve the purpose of the present invention.
In this embodiment, the part of the external prestressed tendon structure 1 extending out of the foundation main body 21 is buried in the soil, and in order to reduce the damage of the water and corrosive substances in the soil to the prestressed tendon itself and the influence on the durability of the prestressed tendon, the external prestressed tendon structure 1 is provided with three layers of protection structures: the HDPE pipe of suit periphery at the steel strand wires, be located waterproof anticorrosive filling layer 14 between steel strand wires and HDPE pipe and the seamless steel pipe of suit periphery at the HDPE pipe, in backfill process and this concrete annular basis in the use, seamless steel pipe still plays steel strand wires such as preventing soil pressure and HDPE pipe produces the destruction.
Preferably, the outer sleeve 13 is a seamless steel pipe (for example, a circular 400 × 6 seamless steel pipe), the seamless steel pipe is connected with the concrete annular foundation 2 by welding, that is, as shown in fig. 4, two ends of the seamless steel pipe are respectively welded with embedded steel bars 22 embedded around a reserved sheath 23 of the foundation main body 21, the embedded steel bars 12 are in contact with and welded with the outer surface of the seamless steel pipe, the welding length is not less than 150mm, a double-sided fillet weld is adopted, the height of a welding leg is 6mm, and full welding is performed along the contact surface; the end of the seamless steel pipe is spaced 200mm from the inner peripheral edge of the base body 21. The seamless steel pipe and the concrete annular foundation 2 are connected in a flexible mode, allowance is reserved for seamless steel pipe settlement caused by soil pressure and the like, and damage to the seamless steel pipe or a foundation main body due to excessive stress generated in settlement is prevented.
RDC concrete (namely low-cement-content mortar concrete) is filled below and on the side of the seamless steel pipe (the outer casing 13), the compactness of the lower part and two sides of the seamless steel pipe is ensured by the concrete, so that the seamless steel pipe is protected, and the seamless steel pipe is prevented from being crushed by backfilling equipment during foundation pit backfilling. As shown in fig. 5, when filling the RDC concrete, the supporting structure 3 is used to ensure the height and levelness of the seamless steel pipe, the seamless steel pipe is first placed in the wooden formwork 31, one steel bracket 32 is arranged every 4m to support the seamless steel pipe, and then the backfilling operation is performed.
The two ends of the external prestressed tendon structure 1 are anchored to the outer periphery of the foundation main body 21 through the anchoring ends 15. In order to facilitate the formation of waterproof anticorrosive filling layer 14 of being in milk between steel strand wires (inner core 11) and HDPE pipe (inlayer sheath 12) to external prestressing tendons structure 1, and anchor prestressing tendons tip, the periphery of the reservation sheath 23 of concrete annular basis 2 has buried tubular anchor section of thick bamboo 25 underground in advance, it is pre-buried HDPE pipe to reserve sheath 23, pre-buried HDPE pipe in basic main part 21 promptly, tubular anchor section of thick bamboo 25 periphery cover is equipped with spiral muscle 26, tubular anchor section of thick bamboo 25 uses with the 15 cooperations of anchor end. Wherein:
referring to fig. 5, the tubular anchor cylinder 25 is a horn-shaped cavity with a gradually decreasing diameter from outside to inside, and is coaxially arranged with the reserved sheath 23 (pre-embedded HDPE pipe, that is, HDPE pipe pre-embedded in the foundation main body 21), and the inner side wall of the horn-shaped cavity is connected with the pre-embedded HDPE pipe in an embedded manner, the end of the reserved sheath 23 (pre-embedded HDPE pipe) is located at the horn mouth of the tubular anchor cylinder 25, and the connection positions of the tubular anchor cylinder 25 and the pre-embedded HDPE pipe are sealed by sealant before the foundation main body 21 is poured; the spiral rib 26 is sleeved on the periphery of the tubular anchor cylinder 25, so that the local compression capacity of the foundation main body 21 is increased, and the foundation main body 21 is prevented from being damaged during prestress tensioning. The end face of the tubular anchor cylinder 25 is provided with a grouting opening 251, the inner cylinder body is provided with a channel 252 for communicating the grouting opening 251 with the inner cavity of the tubular anchor cylinder, and the grouting opening 251 is exposed at the periphery of the foundation main body 21. The anchoring end 15 of the external prestressed tendon mechanism 1, the inner wall of the tubular anchor cylinder 25 of the concrete annular foundation 2 and the port of the embedded HDPE pipe form a relatively sealed grouting area, and the grouting area is communicated with the embedded HDPE pipe.
The anchoring end 15 is used for fixing the tensioned prestressed tendons, and simultaneously sealing the end parts of the prestressed tendons outside the anchor body, so that the prestressed tendons are prevented from being damaged by moisture or corrosive components in soil, and slurry is prevented from flowing out in the grouting process. The anchoring end 15 comprises a working anchor plate 151, a working clamping piece 152 and a non-shrinkage cement mortar sealing anchor 153, the working anchor plate 151 is tightly attached to and connected with the tubular anchor cylinder 25, tapered holes corresponding to the number of steel wires of the steel stranded wires (the inner core 11) are formed in the working anchor plate 151, the working clamping piece 152 is of a semi-open type tapered structure, the steel wires of the steel stranded wires penetrate through the tapered holes of the working anchor plate 151 and the working clamping piece 152, the working clamping piece 152 is matched with the tapered holes of the working anchor plate 151, and the non-shrinkage cement mortar sealing anchor 153 anchors the working anchor plate 151, the working clamping piece 152 and the tensioned steel stranded wires on the periphery of the base body 21.
After the anchoring end 15 finishes the anchoring, grouting operation is performed, namely, slurry of about 0.6MPa is poured into the grouting area through the grouting opening 251 and the channel 252 of the tubular anchor cylinder 25, and the slurry enters the HDPE pipe through the through hole 231 until the grouting cannot be continued.
The construction method of the prestressed concrete annular foundation 01 comprises the following steps:
step one, pouring a foundation main body 21 according to design requirements, and burying an HDPE pipe, a tubular anchor cylinder 25 and embedded steel bars 22 at a reserved design position.
The method specifically comprises the following steps: (1) binding reinforcing steel bars and in-vivo annular prestressed bars at preset positions according to design requirements, binding embedded reinforcing steel bars 22 at the inner sides of the reserved design positions, penetrating HDPE pipes with preset lengths into a tubular anchor cylinder 25 (the HDPE pipes are required to be embedded with the inner side wall of the tubular anchor cylinder 25 and communicated with the inner cavity of the tubular anchor cylinder 25, a grouting opening 251 is formed in the end face of the cylinder wall of the tubular anchor cylinder 25, a channel 252 for communicating the inner cavity with the grouting opening 251 is formed in the cylinder wall of the tubular anchor cylinder), sealing the joint of the inner wall of the tubular anchor cylinder 25 and the embedded HDPE pipes by using sealant (preventing concrete from entering the HDPE pipes when the foundation main body 21 is poured), binding the HDPE pipes to the reserved positions, and enabling the tubular anchor cylinder 25 to be located at the outer side of the; (2) and pouring the foundation main body 21, maintaining the concrete to reach the design strength, and removing the concrete form.
And step two, mounting an HDPE pipe and a seamless steel pipe with preset lengths at one end of the base body 21.
The method specifically comprises the following steps: (1) installing a supporting structure 3 at a specified position (installing a wooden template 31 along the length direction of the seamless steel pipe, and arranging steel brackets 32 on the wooden template 31 at intervals), hoisting the seamless steel pipe with the preset length to the specified position, and sleeving an HDPE pipe with the preset length in the seamless steel pipe in a penetrating manner, wherein preferably, the preset length of the HDPE pipe is half of the total length of the HDPE pipe, the preset length of the seamless steel pipe is less than half of the total length of the seamless steel pipe, and preferably, the preset length of the seamless steel pipe is about 0.5m less than half of the total length of the seamless steel pipe; the HDPE pipe is hermetically connected with the embedded HDPE pipe in the foundation main body 21 (for example, by hot melting welding), the seamless steel pipe is supported on the supporting structure 3, the height and the position of the seamless steel pipe are adjusted to meet the design requirements (namely, the seamless steel pipe is coaxially aligned with the paired reserved sheaths 23 (embedded HDPE pipes) of the foundation main body 21), and then the seamless steel pipe is welded with the embedded steel bars 22 embedded in the foundation main body 21;
and step three, pouring RDC concrete (namely low-cement-content mortar concrete) in the wood template and backfilling a foundation pit in the area where the seamless steel pipe is installed.
The method specifically comprises the following steps: (1) RDC concrete (i.e., low cement content mortar concrete) is poured into the wooden form, and when the RDC concrete reaches a preset strength, the wooden form 31 is removed; (2) and backfilling the foundation pit in the area for installing the seamless steel pipe, reserving a certain length at the end parts of the HDPE pipe and the seamless steel pipe, and not backfilling so as to perform subsequent welding operation.
Step four, the operations of step two to step three are repeatedly performed on the opposite side of the base body 21.
And step five, connecting the HDPE pipes on the two symmetrical sides, welding the seamless steel pipes on the two sides together after the two semicircular steel pipes are in butt welding, and completing the rest of RDC concrete pouring and foundation pit backfilling.
And step six, sleeving the steel strand in the HDPE pipe, symmetrically installing the anchoring ends 15 on the periphery of the base main body 21, and anchoring the anchoring ends 15 after tensioning the steel strand.
The method specifically comprises the following steps: (1) sleeving the steel strand on the HDPE pipe in a penetrating manner, wherein two ends of the steel strand extend out of the base main body 21; (2) sequentially penetrating steel wires of the steel strands through the tapered holes of the working anchor plates 151 and the working clamping pieces 152, and tightly fitting the working anchor plates 151 with the cross sections of the tubular anchor cylinders 25; (3) and tensioning the steel strands by adopting a jack, and cutting off redundant steel strands (the exposed amount of the steel strands is about 30mm) after tensioning is finished. And then, sealing the anchor by using non-shrinkage cement mortar, wherein the working anchor plate 151, the working clamping piece 152 and the exposed steel strand are required to be completely wrapped during anchor sealing, the thickness of a covering layer is more than 15mm, and the HDPE pipeline grouting is carried out after the mortar sealing is finished for 24 hours.
Step seven, injecting the prepared cement slurry into a grouting area from a grouting opening 251 formed in the anchor pipe 25 at one end of the pipe at 0.6MPa, allowing the cement slurry to enter the HDPE pipe, and simultaneously exhausting gas in the HDPE pipe from the grouting area and the grouting opening at the other end of the pipe until the cement slurry cannot be injected continuously; then grouting is performed from the grouting port at the other end in the same manner. After grouting, the cement slurry in the grouting opening is solidified to seal the grouting opening 251. Until all the external prestressed tendon structures 1 are constructed.
In order to accelerate the construction progress, it is preferable that each of the external prestressed tendon structures 1 be simultaneously constructed.
Compared with the prior art, the utility model has the advantages of:
(1) the utility model discloses an external prestressing tendons structure 1 carries out the post-prestressing tension to the concrete annular foundation 2 of burying underground in soil and handles, and the reasonable characteristic of having utilized concrete "the pressurized does not receive and draw" makes the basis concrete be in compression state always, saves a large amount of reinforcing bar quantity that are used for preventing the concrete and are drawn the usefulness simultaneously for basic size and material quantity reduce by a wide margin.
(2) The utility model discloses external prestressing tendons structure 1 is equipped with three-layer protective structure: the HDPE pipe of suit in inner core 11 periphery, lie in waterproof anticorrosive filling layer 14 and the outer sleeve pipe 13 of suit in HDPE pipe periphery between inner core 11 and HDPE pipe, in backfill process and this concrete annular basis in the use, outer sleeve pipe 13 still plays and prevents that soil pressure etc. from producing destruction to external prestressing tendons and HDPE pipe.
(3) The connection form of the outer casing 13 (preferably seamless steel pipe) and the concrete annular foundation 2 is flexible connection, allowance is reserved for seamless steel pipe settlement caused by pressure such as soil, and damage to the seamless steel pipe or a foundation main body due to excessive stress generated in settlement is prevented.
(4) The lower part and the side of the outer casing 13 (preferably a seamless steel pipe) are filled with RDC concrete, the compactness of the lower part and two sides of the seamless steel pipe is ensured by the concrete, the seamless steel pipe is protected, and the seamless steel pipe is prevented from being crushed by backfilling equipment during foundation pit backfilling.
It will be understood by those skilled in the art that these examples are given solely for the purpose of illustration and are not intended to limit the scope of the invention, and that various equivalent modifications and adaptations of the invention are intended to fall within the scope of the invention disclosed herein.
Claims (10)
1. The utility model provides an external prestressing tendons structure, is the radial post-tensioning stress muscle in concrete annular basis (2), its characterized in that includes:
an inner core (11) as a tendon;
the inner layer sheath (12) is sleeved on the periphery of the inner core (11);
the outer layer sleeve (13) is sleeved on the periphery of the inner layer sheath (12);
the waterproof and anticorrosive filling layer (14) is arranged between the inner core and the inner layer sheath (12);
the two ends of the inner layer sheath (12) are symmetrically embedded in a foundation main body (21) of the concrete annular foundation (2), the outer layer sleeve (13) is flexibly connected to the inner side of the foundation main body (21), and the inner core (11) is symmetrically anchored on the periphery of the foundation main body (21).
2. The in vitro tendon structure of claim 1, wherein the inner core (11) is a steel strand, the inner sheath (12) is an HDPE pipe, the outer casing (13) is a seamless steel pipe, and the waterproof and anticorrosive filling layer (14) is waterproof and anticorrosive cement slurry.
3. The in-vitro prestressed tendon structure of claim 2, wherein the preset installation area of the foundation body (21) is provided with a plurality of reserved sheaths (23) in pairs at intervals, each reserved sheath (23) is an embedded HDPE (high-density polyethylene) pipe for penetrating steel strands, a plurality of embedded steel bars (22) are embedded around each embedded HDPE pipe on the inner side of the foundation body (21) at intervals, one end of each embedded steel bar (22) is embedded into the foundation body (21), and the other end of each embedded steel bar extends out of the inner side of the foundation body (21) and is used for welding seamless steel pipes.
4. The in-vitro prestressed tendon structure of claim 3, wherein the embedded steel bar (22) is embedded into the foundation body to a depth of not less than 800mm, and the length of the embedded steel bar (22) extending out of the foundation body (21) is not less than 450 mm.
5. The in vitro prestressed tendon structure of claim 3 or 4, wherein the embedded steel bars (22) are welded on the outer surface of the seamless steel pipe, the welding length is not less than 150mm, and the distance from the end of the seamless steel pipe to the inner peripheral edge of the foundation main body (21) is 50-200 mm.
6. A prestressed concrete ring foundation comprising a foundation main body (21), characterized in that a plurality of external prestressed tendon structures (1) as claimed in any one of claims 2 to 5 are provided at intervals in the radial direction of the foundation main body (21), and the steel strands of the external prestressed tendon structures (1) are symmetrically anchored at the periphery of the foundation main body (21) through anchoring ends (15); an annular prestressed tendon is embedded in the area, close to the periphery, of the foundation main body (21) of the concrete annular foundation (2).
7. The prestressed concrete annular foundation of claim 6, wherein the tubular anchor cylinder (25) is embedded in the periphery of the embedded HDPE pipe of the foundation main body (21), the spiral rib (26) is sleeved on the periphery of the tubular anchor cylinder (25), the periphery of the embedded HDPE pipe is embedded and connected with the inner side wall of the tubular anchor cylinder (25), the end face of the tubular anchor cylinder (25) is located on the periphery of the foundation main body (21), and the anchoring end (15) is fixed on the tubular anchor cylinder (25).
8. The prestressed concrete annular foundation of claim 7, wherein the tubular anchor cylinder (25) is a flared cavity with a gradually decreasing diameter from outside to inside, and is coaxially arranged with the embedded HDPE pipe, the inner side wall of the flared cavity is connected with the embedded HDPE pipe in an embedded manner, and the end part of the embedded HDPE pipe is located at the flare opening of the tubular anchor cylinder; the end face of the tubular anchor cylinder (25) is provided with a grouting opening (251), the inner cylinder body is provided with a channel (252) for communicating the grouting opening (251) with the inner cavity of the tubular anchor cylinder, and the grouting opening (251) is exposed at the periphery of the base main body (21).
9. The prestressed concrete ring foundation of claim 8, wherein the anchoring end (15) comprises a working anchor plate (151), a working clamping piece (152) and a non-shrinkage cement mortar sealing anchor (153), the working anchor plate (151) is tightly attached to and connected with the tubular anchor cylinder (25), tapered holes corresponding to the number of steel wires of the steel strands are formed in the working anchor plate, the working clamping piece (152) is of a semi-open type tapered structure, the steel wires of the steel strands penetrate through the tapered holes of the working anchor plate (151) and the working clamping piece (152), the working clamping piece (152) is matched with the tapered holes of the working anchor plate (151), and the non-shrinkage cement mortar sealing anchor (153) anchors the working anchor plate (151), the working clamping piece (152) and the tensioned steel strands to the periphery of the foundation body (21).
10. A prestressed concrete ring foundation as claimed in any one of claims 6 to 9, characterized in that the lower and both side part areas of the seamless steel pipe of said external tendon structure (1) are filled with mortar concrete having a low cement content.
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| CN111139856A (en) * | 2019-10-31 | 2020-05-12 | 中材海外工程有限公司 | External prestressed tendon structure, prestressed concrete annular foundation and construction method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111139856A (en) * | 2019-10-31 | 2020-05-12 | 中材海外工程有限公司 | External prestressed tendon structure, prestressed concrete annular foundation and construction method thereof |
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