CN111188268A - Super-large cast-in-situ gravity type anchorage and construction method - Google Patents
Super-large cast-in-situ gravity type anchorage and construction method Download PDFInfo
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- CN111188268A CN111188268A CN201911416400.XA CN201911416400A CN111188268A CN 111188268 A CN111188268 A CN 111188268A CN 201911416400 A CN201911416400 A CN 201911416400A CN 111188268 A CN111188268 A CN 111188268A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/14—Towers; Anchors ; Connection of cables to bridge parts; Saddle supports
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0075—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability making use of a decrease in temperature
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
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Abstract
The invention relates to an oversized cast-in-situ gravity type anchorage and a construction method, which comprises the following steps: a large cast-in-situ gravity type anchorage cantilever template system and an ultra-large gravity type anchorage temperature control system; the cast-in-situ gravity anchor is a reinforced concrete structure and mainly comprises a cable saddle buttress foundation, an anchor block, a cable saddle buttress, a front anchor chamber and a ballast block. The invention has the beneficial effects that: in the invention, the bracket, the template and the construction load are all borne by the embedded parts, and no additional scaffold is needed, so that the method is suitable for high-altitude operation; all components are connected in an assembling mode, the connection mode is flexible and reliable, and the assembly is convenient; each connecting piece has high standardization degree and strong universality; the template part can be adjusted up and down, left and right relative to the support frame part, the cantilever support is provided with the inclined strut, the perpendicularity of the template can be conveniently adjusted, the maximum angle is +/-18 degrees, and the use is flexible.
Description
Technical Field
The invention belongs to the field of construction of constructional engineering, and particularly relates to an oversized cast-in-place gravity type anchorage and a construction method, which are suitable for the construction engineering of an oversized concrete structure.
Background
With the continuous development of social economy in China, traffic construction projects such as highways, railways, light rails and the like are gradually developed, and a large bridge and a grand bridge which cross rivers, sea and the like are continuously emerged. Suspension bridges are increasingly the preferred bridge type for river-crossing bridges due to their great crossing capacity. The gravity type anchorage is a type of a main cable rope anchored by a suspension bridge, bears the vertical and horizontal forces of the main cable rope, and is one of key structures for ensuring the safety of the suspension bridge.
The gravity type anchorage has the characteristics of large concrete volume, long duration, high concrete strength grade, high construction technical requirement and the like, and the key problem in construction is how to control the temperature stress in the construction process and prevent harmful cracks from generating except that the construction of the gravity type anchorage meets the design strength requirement. The cantilever template is a common building template in the construction process of mass concrete, in the prior art, various cantilever templates are provided, such as a hydraulic self-climbing cantilever template, a backward-moving cantilever template, an inclined cantilever template and the like, the design and technical requirements are different, but in the construction process of the super-gravity anchor, the distance of the template needs to be adjusted, the template of the existing backward-moving cantilever template is not adjustable, so that the resource waste is inevitably caused, and the construction efficiency is reduced.
In view of this, in order to overcome the disadvantages of the conventional oversized cast-in-place gravity anchor construction, a oversized cast-in-place gravity anchor and a construction method are urgently needed to improve construction efficiency, improve construction quality and ensure safe and reliable construction quality.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides the oversized cast-in-place gravity anchor and the construction method, which can effectively improve the construction quality and the on-site construction efficiency of the oversized cast-in-place gravity anchor, and have the characteristics of environmental protection, energy conservation, convenient construction, good effect, simple assembly and disassembly and the like.
The oversized cast-in-situ gravity type anchorage comprises an oversized cast-in-situ gravity type anchorage cantilever template system and an oversized gravity type anchorage temperature control system; the cast-in-situ gravity type anchorage is a reinforced concrete structure and mainly comprises a cable saddle buttress foundation, an anchor block, a cable saddle buttress, a front anchor chamber and a weight block;
the oversized cast-in-situ gravity type anchorage cantilever template system comprises a template, a main back ridge, an inclined strut, a backward moving device, a tripod, a climbing cone, a cantilever frame and a vibrating rod fixing support; the template is a shaped steel template provided with a cross beam, the template is connected with the main back ridge through bolts and fasteners, and the template acts on the tripod through a backward moving device; the main back edge is formed by assembling double-spliced channel steel, the main back edge is fixed through an inclined strut, two rows of bolt holes are reserved in the longitudinal direction of the channel steel, and the two channel steel are separated by a steel beam and connected through bolts; the backward moving device is provided with a main back ridge adjusting seat and a steel ear plate and integrally acts on the tripod; the tripod mainly comprises a steel springboard, a support rod, a platform beam and an auxiliary lacing wire, all loads of the tripod are borne by a climbing cone, a cast embedded plate, a high-strength screw and an embedded support, and a supporting foot is arranged at the bottom end of the tripod; the vibrating rod fixing support is formed by fixedly assembling a telescopic rod and a steel pipe through a fastener, and is arranged in a sliding groove reserved on the cantilever frame.
The ultra-high gravity type anchorage temperature control system comprises a cold water machine cold water concrete mold-entering temperature control system and a cooling water circulation system; in the cold water machine cold water concrete mold-entering temperature control system, a make-up water tank is connected with a refrigerator through a water pump, frozen water is concentrated in a cooling water tank, and a mixing station is connected with the cooling water tank through the water pump; the cooling water circulation system comprises a cooling water pool, a circulation water tank and a water separator, cooling water flows out of the circulation water tank and flows into the water separator through pressurization of a water pump, the water separator divides water to each layer of cooling pipe, and the water flows out of the circulation water tank through the cooling pipes to form a circulation; the water separator is provided with a corresponding number of independent water valves and a certain number of pressure reducing valves; .
Preferably, the method comprises the following steps: the main back ridge adjusting seat is of a cuboid structure, and a plurality of pairs of bolt holes are reserved.
Preferably, the method comprises the following steps: the inclined strut is a telescopic supporting rod, the top end of the inclined strut is fixed in bolt holes reserved in different positions on the main back edge through bolts, and the bottom end of the inclined strut is hinged to the steel ear plate.
Preferably, the method comprises the following steps: the tripod comprises a support rod and an auxiliary lacing wire, wherein the auxiliary lacing wire is used for oppositely pulling between the vertical rod and the platform beam.
Preferably, the method comprises the following steps: the utility model discloses a vibrating rod, ram fixing support, telescopic link, ram fixing support.
Preferably, the method comprises the following steps: the cooling water pool comprises a steel plate inner film, a polyurethane foam heat-insulating layer and a batten support filler, and precast slab cover plates are arranged above the cooling water pool and the make-up water pool.
Preferably, the method comprises the following steps: the circulating water tank is provided with a temperature sensor.
Preferably, the method comprises the following steps: the cooling pipes are arranged in the concrete in an S shape, the upper layer and the lower layer are arranged in a composite staggered mode to form a space grid structure, the distance between each cooling pipe and the concrete surface is not less than 50cm, each water pipe is provided with a water inlet and a water outlet, and the pipe length is not more than 200 m; the cooling pipe is made of an iron sheet pipe with certain strength and good heat conducting property, the pipes are connected through threads and threads, and a raw adhesive tape is pasted on the pipes; the suspended part of the cooling pipe is welded with the vertical steel bar, and the cooling pipe is fixed on the vertical steel bar through the shaped placing piece.
The construction method of the oversized cast-in-situ gravity type anchorage comprises the following steps:
s1: construction preparation: preparing a cantilever template, a main back ridge, an inclined strut, a backward moving device, a tripod, a climbing cone, a cantilever frame, a vibrating rod fixing support, a circulating water tank, a refrigerating machine and a cooling pipe which are required by construction;
s2: erecting a template support: erecting an oversized cast-in-situ gravity type anchorage cantilever template system and erecting a steel-wood combined template;
s3: constructing an ultra-high gravity type anchorage temperature control system: constructing a cooling water pool and a make-up water pool, manufacturing a cooling water circulating system, connecting a cooling pipe and performing water passing inspection;
s4: and (3) carrying out super-large cast-in-situ gravity type anchorage partition and block construction: according to the temperature control requirement, an oversized cast-in-situ gravity type anchorage anchor body is divided into five pieces of construction, namely a loose cable saddle buttress foundation, an anchor block, a loose cable saddle buttress, a front anchor chamber and a ballast block, and concrete is poured in a layered parallel symmetrical mode; after the anchor blocks are completely constructed, constructing a post-cast strip between the anchor blocks and the cable saddle buttress foundation;
s5: construction and maintenance of mass concrete: preparing the double-doped concrete, adopting a pump machine to be matched with a distributing machine to convey the distribution, and arranging vibrating rods to carry out struggle construction on the concrete; after the concrete is demolded, chiseling floating slurry on the surface of the concrete; adopting measures of cooling by circulating water and wrapping a glass wool heat-insulating layer to carry out concrete curing;
s6: removing and cleaning the template support: after the construction is finished, the erected formwork support is dismantled, and the field is cleaned;
the erection of the oversized cast-in-situ gravity type anchorage cantilever template system in the S2 comprises the following steps:
s2-1: splicing the templates on a platform of a carpentry house, and installing a lifting hook;
s2-2: assembling the main back edge and the diagonal brace, and installing and fastening a connecting piece;
s2-3: when concrete is poured for the first time, firstly embedding a creeping cone, a cast embedded plate, a high-strength screw rod and an embedded support when a bottom plate is poured so as to reinforce a template;
s2-4: assembling the tripod and the backward moving device, inserting the bolt, and installing the upright of the platform;
s2-5: the first pouring and the form removal, the installation of stressed bolts, the hanging of a tripod, the form and the main back ridge, the die assembly and the second pouring of concrete;
s2-6: lifting the template and the bracket, installing a lifting platform, and pouring concrete for the third time;
s2-7: and pouring for the third time.
The invention has the beneficial effects that:
(1) in the invention, the bracket, the template and the construction load are all borne by the embedded parts, and no additional scaffold is needed, so that the method is suitable for high-altitude operation; all components are connected in an assembling mode, the connection mode is flexible and reliable, and the assembly is convenient; each connecting piece standardization level is high, and the commonality is strong.
(2) The template part can be adjusted up and down, left and right relative to the support frame part, the cantilever support is provided with the inclined strut, the perpendicularity of the template can be conveniently adjusted, the maximum angle is +/-18 degrees, and the use is flexible.
(3) The template is provided with the lifting platform which can be used for dismantling embedded parts and treating concrete, and meanwhile, the movable extensible vibrating rod fixing support is arranged, so that the vibrating efficiency of the concrete can be improved.
(4) The invention adopts the circulating water tank as a storage body of cooling water, the cooling water in the water tank is conveyed to the water separator through the water pump, the cooling water is divided into a plurality of water flows through the water separator and enters different cooling water pipes, the cooling water pipes are in S-shaped and are vertically and compositely staggered in the concrete to form a net structure which is distributed in the concrete, the cooling effect in the concrete can be effectively ensured, the cooling water discharged from the cooling water pipes is collected and recovered through the water recovery system and is recovered to the water tank, the secondary utilization of the cooling water can be realized, and resources are saved.
Drawings
FIG. 1 is a schematic diagram of a partitioned layered structure of an oversized cast-in-place gravity type anchorage of the invention;
FIG. 2 is a schematic diagram of an ultra-high gravity type anchorage cantilever template system according to the present invention;
FIG. 3 is a schematic view of the structure of the main back edge of the present invention;
FIG. 4 is a schematic view of the structure of the backward moving device of the present invention;
FIG. 5 is a schematic view of a tripod configuration according to the present invention;
FIG. 6 is a schematic view of the vibrating rod fixing bracket according to the present invention;
FIG. 7 is a schematic view of the cooling water pool and makeup water pool of the present invention;
FIG. 8 is a schematic diagram of a cold water machine cooling water concrete mold-entering temperature control technique according to the present invention;
FIG. 9 is a schematic view showing a cooling water circulation structure according to the present invention;
FIG. 10 is a view showing the arrangement of cooling water pipes in layers according to the present invention;
FIG. 11 is a schematic view of the cooling water pipe connection according to the present invention;
FIG. 12 is a schematic view of the cooling water pipe fixing structure according to the present invention.
Description of reference numerals: 1-scattered cable saddle buttress foundation, 2-anchor block, 3-scattered cable saddle buttress, 4-front anchor chamber, 5-weight block, 6-template, 7-main back ridge, 8-diagonal brace, 9-backward moving device, 10-tripod, 11-climbing cone, 12-casting embedded plate, 13-high-strength screw, 14-bolt, 15-embedded support, 16-bolt, 17-back ridge adjusting seat, 18-hanging platform cross bar, 19-steel beam, 20-steel springboard, 21-upright post, 22-fastener, 23-cantilever frame, 24-channel steel, 25-bolt hole, 26-steel ear plate, 27-main back ridge support, 28-support bar, 29-auxiliary tie bar, 30-support leg, 31-platform cross beam and 32-vibrating rod fixing support, 33-telescopic rod, 34-steel pipe, 35-chute, 36-cooling water pool, 37-make-up water pool, 38-steel plate inner membrane, 39-polyurethane foam heat insulation layer, 40-batten support filling, 41-precast slab cover plate, 42-water pump, 43-refrigerator, 44-mixing station, 45-circulating water tank, 46-water valve, 47-four-way connector, 48-water separator, 49-cooling pipe, 50-water inlet, 51-water outlet, 52-screw thread, 53-vertical reinforcing steel bar, 54-placing fastener and 55-pressure reducing valve.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are set forth merely to aid in the understanding of the invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
As shown in fig. 1 to 12, the oversized in-situ gravity type anchorage comprises an oversized in-situ gravity type anchorage cantilever template system and a oversized in-situ gravity type anchorage which is of a large-volume concrete structure; the cast-in-situ gravity type anchorage is of a reinforced concrete structure, is composed of a cable saddle buttress foundation 1, an anchor block 2, a cable saddle buttress 3, a front anchor chamber 4, a weight block 5 and the like, and is cast with concrete in a layered, block-divided and parallel symmetrical mode, wherein the side walls of the anchor block 2, the cable saddle buttress 3, the weight block 5 and the front anchor chamber 4 are constructed by cantilever templates, and other structure constructions adopt steel-wood combined templates.
The oversized cast-in-situ gravity type anchorage cantilever template system comprises a template 6, a main back ridge 7, an inclined strut 8, a backward moving device 9, a tripod 10, a climbing cone 11, a cantilever 23, a vibrating rod fixing support 32 and the like, wherein the template 6 is a shaped steel template provided with a cross beam, is connected with the main back ridge 7 through a bolt 16 and a fastener 22, and acts on the tripod 10 through the backward moving device 9; the main back edge 7 is formed by assembling double-spliced channel steel and is fixed by an inclined strut 8, two rows of bolt holes 25 are reserved in the channel steel along the longitudinal direction, and a steel beam 19 is arranged between the two channel steel at intervals and is connected by bolts; the backward moving device 9 is provided with a main back ridge adjusting seat 17 and a steel ear plate 26, and integrally acts on the tripod 10; the tripod 10 comprises a steel springboard 20, a support rod 28, a platform beam 31, an auxiliary lacing wire 29 and the like, all loads are borne by a climbing cone 11, a cast embedded plate 12, a high-strength screw 13, an embedded support 15 and the like, and a supporting foot connected with a concrete wall surface is arranged at the bottom end of the tripod; the vibrating rod fixing bracket 32 is formed by assembling and fixing a telescopic rod 33 and a steel pipe 34 through a fastener 22, and is arranged in a chute reserved on the cantilever 23.
The super-large gravity type cast-in-place gravity type anchorage is constructed for a large-volume concrete structure, the temperature control of the super-large gravity type anchorage is a key control point in the construction process, and the super-large gravity type anchorage temperature control system comprises a water chilling mechanism cold water concrete mold-entering temperature control technology, a cooling water circulation system, a cooling pipe composite arrangement self-circulation control cooling water flow and concrete cooling gradient technology, a super-large gravity type anchorage double-doped concrete mixing ratio optimization technology, and a cooling circulation water and cover glass wool heat preservation 'inside-falling-outside-protection' maintenance technology. According to the cold water machine cold water concrete mold-entering temperature control technology, water in a make-up water tank 37 is pumped to a refrigerator 43 through a water pump 42, frozen water is concentrated to a cooling water tank 36, and the purpose of controlling the concrete mold-entering temperature in a mixing station 44 is achieved; the cooling water circulation system comprises a cooling water pool 36, a circulation water tank 45, a water separator 48 and the like, cooling water flows out from the circulation water tank 45, is pressurized by a water pump 42 and flows into the water separator 48, the water separator 48 separates water to each layer of cooling pipe 49, and the water flows out to the circulation water tank 45 through the cooling pipes to form a circulation, and meanwhile, water is continuously pumped from the cooling water pool 36 to a water outlet tank, so that the circulation water consumption is ensured and the water temperature is adjusted; the water separator 48 is provided with a corresponding number of independent water valves 46 to control the flow rate of cooling water of each set of water pipe, and is provided with a certain number of reducing valves 55 to control the later water flow rate; the concrete is C40 double-doped large-volume concrete, and the mixing ratio is as follows: water: cement: fly ash: mineral powder: sand: 4.75-9.5mm crushed stone: 9.5-19mm crushed stone: 19-26.5mm crushed stone: additives 147:189:147:84:778:215:430:430: 3.78; the concrete curing technology follows the principle of 'internal cooling and external protection', and measures of cooling by cooling circulating water and wrapping a glass wool heat-insulating layer are comprehensively adopted.
Furthermore, the main back ridge adjusting seat 17 is of a cuboid structure, a plurality of pairs of bolt holes are reserved, the template part can be adjusted up and down, left and right relative to the support frame part, the template part can be integrally moved back by 600mm, and the use is flexible; the inclined strut 8 is a telescopic supporting rod, the top end of the telescopic supporting rod can be fixed in bolt holes 25 reserved in different positions on the main back ridge 7 through bolts 14, the bottom end of the telescopic supporting rod is hinged and fixed on a steel ear plate 26, the verticality of the main back ridge can be adjusted conveniently, the adjustable maximum angle is +/-18 degrees, and the working performance of the inclined strut can be fully exerted; the tripod 20 comprises a support rod 28 and at least two auxiliary tie bars 29, wherein the at least two auxiliary tie bars are used for oppositely pulling the vertical rod 21 and the platform beam 31, so that the stability of the tripod is further improved; the telescopic link one end of the excellent fixed bolster that vibrates 32 be equipped with the screw hole, the spout thickness that outrigger 33 was reserved is a bit bigger than the screw rod diameter, can fix the position of the excellent fixed bolster that vibrates through screwing up the screw rod, then can remove according to the construction requirement when loosening, form and remove extendible excellent fixed bolster that vibrates for the efficiency that vibrates of concrete.
Further, the cooling water pool 36 comprises a steel plate inner membrane 38, a polyurethane foam heat insulation layer 39 and a batten support filler 40, and a precast slab cover plate 41 is arranged above the cooling water pool 36 and the make-up water pool 37 to ensure the normal operation of the refrigerator 43; a temperature sensor is distributed in the circulating water tank 45, the temperature of water is regulated and controlled by the circulating water tank 45, so that the difference between the water inlet temperature and the highest temperature inside the concrete is less than 25 ℃, and the temperature of the circulating water is reduced by supplementing cooling water into the water tank in the temperature reduction stage; the cooling pipes 49 are arranged in the concrete in an S shape, the upper layer and the lower layer are arranged in a vertically staggered mode in a composite mode to form a space grid structure, the distance between the horizontal pipes of the water pipes is 100cm, the distance between the vertical pipes and the surface of the concrete is not smaller than 50cm, each set of water pipes is provided with a water inlet and outlet, and the pipe length is not larger than 200 m; the cooling pipe 49 is made of an iron sheet pipe with certain strength and good heat conducting property, the pipes are connected through screw threads 52, and a raw adhesive tape is pasted for water prevention; the overhanging portion of the cooling tube 49 is welded to the upstanding ribs 53, and the cooling tube 49 is secured to the upstanding ribs 53 by the shaped shelves 54.
The construction method of the oversized cast-in-situ gravity type anchorage comprises the following steps:
s1: construction preparation: according to the construction requirement of the oversized cast-in-place gravity type anchorage, a cantilever template 6, a main back ridge 7, an inclined strut 8, a backward moving device 9, a tripod 10, a climbing cone 11, a cantilever frame 23, a vibrating rod fixing support 32, a circulating water tank 45, a refrigerator 43, a cooling pipe 49 and the like required by construction are prepared;
s2: erecting a template support: erecting an oversized cast-in-situ gravity type anchorage cantilever template system and erecting a steel-wood combined template;
s2-1: the template 6 is assembled on the platform of the carpentry room, the flatness of the template is guaranteed, and the lifting hook is arranged.
S2-2: and assembling the main back edge 7 and the inclined strut 8, and tightening the installation of the connecting piece.
S2-3: when the concrete is poured for the first time, embedded parts such as the creeping cone 11, the cast embedded part plate 12, the high-strength screw 13, the embedded part support 15 and the like are embedded when the bottom plate is poured so as to reinforce the template 6 for use.
S2-4: the tripod 10 and the distancing means 9 are assembled, the bolt 14 is inserted and the uprights 21 of the platform are raised.
S2-5: and (3) pouring and removing the formwork for the first time, installing the stressed bolt 16, the hanging tripod 10, the formwork 6 and the main back ridge 7, closing the formwork and pouring concrete for the second time.
S2-6: and lifting the template 6 and the bracket, installing a lifting platform, and pouring concrete for the third time.
S2-7: and pouring for the third time.
S3: and (3) constructing a large-volume concrete temperature control system: constructing a cooling water pool 36 and a make-up water pool 37, manufacturing a cooling water circulating system, connecting a cooling pipe 49 and performing water passing inspection;
s4: and (3) carrying out super-large cast-in-situ gravity type anchorage partition and block construction: according to the temperature control requirement, the oversized cast-in-situ gravity type anchorage anchor body is divided into five pieces of a loose cable saddle buttress foundation 1, an anchor block 2, a loose cable saddle buttress 3, a front anchor chamber 4 and a ballast block 5 for construction, and concrete is poured in a layered parallel symmetrical mode. And after the anchor blocks are completely constructed, constructing a post-cast strip between the anchor block 2 and the cable saddle buttress foundation 1.
S5: construction and maintenance of mass concrete: designing and preparing C40 double-doped concrete, adopting a pump machine to be matched with a distributing machine to convey the distribution, and arranging vibrating rods to carry out the break-loose construction of the concrete; after the concrete is demolded, chiseling floating slurry on the surface of the concrete in time; based on the principle of 'internal cooling and external protection', measures of cooling by circulating water and wrapping a glass wool heat-insulating layer are comprehensively adopted for concrete curing.
S6: removing and cleaning the template support: and (4) removing the erected template support after construction is completed, and cleaning the field.
Claims (10)
1. The super large cast-in-situ gravity type anchorage is characterized by comprising a super large cast-in-situ gravity type anchorage cantilever template system and a super large gravity type anchorage temperature control system; the cast-in-situ gravity anchor is a reinforced concrete structure, and mainly comprises a saddle buttress foundation (1), an anchor block (2), saddle buttress piers (3), a front anchor chamber (4) and a ballast block (5);
the oversized cast-in-situ gravity type anchorage cantilever template system comprises a template (6), a main back ridge (7), an inclined strut (8), a backward moving device (9), a tripod (10), a climbing cone (11), a cantilever frame (23) and a vibrating rod fixing support (32); the template (6) is a shaped steel template provided with a cross beam, the template (6) is connected with the main back edge (7) through a bolt (16) and a fastener (22), and the template (6) acts on the tripod (10) through a backward moving device (9); the main back edge (7) is formed by assembling double-spliced channel steel (24), the main back edge (7) is fixed through an inclined strut (8), two rows of bolt holes (25) are reserved in the channel steel along the longitudinal direction, and the two channel steel are provided with steel beams (19) at intervals and connected through bolts; the backward moving device (9) is provided with a main back ridge adjusting seat (17) and a steel ear plate (26) and integrally acts on the tripod (10); the tripod (10) mainly comprises a steel springboard (20), a support rod (28), a platform beam (31) and an auxiliary lacing wire (29), all loads of the tripod are born by a climbing cone (11), a casting embedded plate (12), a high-strength screw (13) and an embedded support (15), and a supporting foot (30) is arranged at the bottom end of the tripod; the vibrating rod fixing support (32) is formed by assembling and fixing a telescopic rod (33) and a steel pipe (34) through a fastener (22), and the vibrating rod fixing support (32) is arranged in a sliding groove (35) reserved on the cantilever frame (23);
the ultra-high gravity type anchorage temperature control system comprises a cold water machine cold water concrete mold-entering temperature control system and a cooling water circulation system; in the cold water machine cold water concrete mold-entering temperature control system, a make-up water tank (37) is connected with a refrigerator (43) through a water pump (42), frozen water is concentrated in a cooling water tank (36), and a mixing station (44) is connected with the cooling water tank (36) through the water pump (42); the cooling water circulation system comprises a cooling water pool (36), a circulation water tank (45) and a water separator (48), cooling water flows out from the circulation water tank (45), flows into the water separator (48) through pressurization of a water pump (42), is separated to each layer of cooling pipe (49) by the water separator (48), and flows out to the circulation water tank (45) through the cooling pipes to form a circulation; the water separator (48) is provided with a corresponding number of independent water valves (46) and a certain number of pressure reducing valves (55).
2. The oversized in-situ casting gravity type anchorage of claim 1, characterized in that the main back ridge adjusting seat (17) is of a cuboid structure, and a plurality of pairs of bolt holes are reserved.
3. The oversized in-situ casting gravity type anchorage of claim 1, characterized in that the diagonal brace (8) is a telescopic support bar, the top end of which is fixed in bolt holes (25) reserved at different positions on the main back ridge (7) through bolts (14), and the bottom end of which is hinged on a steel ear plate (26).
4. An oversized in-situ gravity anchor according to claim 1, characterised in that the tripod (20) comprises a support bar (28) and an auxiliary tie bar (29) for counter-pulling between the uprights (21) and platform beams (31).
5. The huge cast-in-place gravity type anchorage of claim 1, characterized in that one end of the telescopic rod (33) of the vibrating rod fixing support (32) is provided with a threaded hole, the thickness of the reserved chute of the cantilever (33) is larger than the diameter of the screw, and the position of the vibrating rod fixing support is fixed by the screw.
6. The ultra-large cast-in-place gravity type anchorage of claim 1, wherein the cooling water pool (36) comprises a steel plate inner membrane (38), a polyurethane foam heat insulation layer (39) and a batten support filler (40), and a precast slab cover plate (41) is arranged above the cooling water pool (36) and the supplement water pool (37).
7. The ultra-large cast-in-situ gravity type anchorage of claim 1, wherein the circulating water tank (45) is provided with a temperature sensor.
8. The huge cast-in-place gravity type anchorage of claim 1, characterized in that the cooling pipes (49) are arranged in the concrete in an S shape, the upper and lower layers are vertically arranged in a composite staggered manner to form a space grid structure, the distance between the cooling pipes (49) and the concrete surface is not less than 50cm, each water pipe is provided with a water inlet and outlet, and the pipe length is not more than 200 m; the cooling pipe (49) is made of an iron sheet pipe with certain strength and good heat conducting property, the pipes are connected through screw threads (52), and a raw adhesive tape is pasted; the suspended part of the cooling pipe (49) is welded with an upright reinforcing steel bar (53), and the cooling pipe (49) is fixed on the upright reinforcing steel bar (53) through a shaped laying piece (54).
9. The construction method of the oversized in-situ casting gravity type anchorage as claimed in claim 1, characterized by comprising the following steps:
s1: construction preparation: preparing a cantilever template (6), a main back ridge (7), an inclined strut (8), a backward moving device (9), a tripod (10), a climbing cone (11), a cantilever frame (23), a vibrating rod fixing support (32), a circulating water tank (45), a refrigerating machine (43) and a cooling pipe (49) which are required by construction;
s2: erecting a template support: erecting an oversized cast-in-situ gravity type anchorage cantilever template system and erecting a steel-wood combined template;
s3: constructing an ultra-high gravity type anchorage temperature control system: constructing a cooling water pool (36) and a make-up water pool (37), manufacturing a cooling water circulating system, connecting a cooling pipe (49) and performing water passing inspection;
s4: and (3) carrying out super-large cast-in-situ gravity type anchorage partition and block construction: according to the temperature control requirement, an oversized cast-in-situ gravity type anchorage anchor body is divided into five pieces of a cable saddle buttress foundation (1), an anchor block (2), a cable saddle buttress (3), a front anchor chamber (4) and a ballast block (5) for construction, and concrete is poured in a layered parallel symmetrical mode; after the anchor blocks are completely constructed, constructing a post-cast strip between the anchor block (2) and the cable saddle buttress foundation (1);
s5: construction and maintenance of mass concrete: preparing the double-doped concrete, adopting a pump machine to be matched with a distributing machine to convey the distribution, and arranging vibrating rods to carry out struggle construction on the concrete; after the concrete is demolded, chiseling floating slurry on the surface of the concrete; adopting measures of cooling by circulating water and wrapping a glass wool heat-insulating layer to carry out concrete curing;
s6: removing and cleaning the template support: and (4) removing the erected template support after construction is completed, and cleaning the field.
10. The construction method of the oversized in-situ casting gravity type anchorage according to claim 9, characterized in that the erection of the oversized in-situ casting gravity type anchorage cantilever formwork system in S2 comprises the following steps:
s2-1: splicing the templates (6) on a platform of a carpentry house, and installing a lifting hook;
s2-2: assembling a main back edge (7) and an inclined strut (8), and installing and fastening a connecting piece;
s2-3: when concrete is poured for the first time, firstly, a creeping cone (11), a casting embedded plate (12), a high-strength screw rod (13) and an embedded support (15) are embedded when a bottom plate is poured, so that a template (6) is reinforced;
s2-4: assembling the tripod (10) and the backward moving device (9), inserting the bolt (14) and installing the upright rod (21) of the platform;
s2-5: the first pouring and the form removal, the installation of stressed bolts (16), the hanging of the triangular frame (10), the template (6) and the main back ridge (7), the mold assembly and the second pouring of concrete;
s2-6: lifting the template (6) and the bracket, installing a lifting platform, and pouring concrete for the third time;
s2-7: and pouring for the third time.
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