CN111254969B - Construction method of large-tonnage crawler crane combined type foundation - Google Patents
Construction method of large-tonnage crawler crane combined type foundation Download PDFInfo
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- CN111254969B CN111254969B CN202010065726.9A CN202010065726A CN111254969B CN 111254969 B CN111254969 B CN 111254969B CN 202010065726 A CN202010065726 A CN 202010065726A CN 111254969 B CN111254969 B CN 111254969B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/44—Foundations for machines, engines or ordnance
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
- E02D27/14—Pile framings, i.e. piles assembled to form the substructure
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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
- E02D31/08—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 transmission of vibrations or movements in the foundation soil
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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
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
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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
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
- E02D5/385—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds with removal of the outer mould-pipes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0023—Cast, i.e. in situ or in a mold or other formwork
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Abstract
The invention relates to a construction method of a large-tonnage crawler crane combined type foundation, which comprises the following steps: construction preparation; widening a platform and constructing an assembled retaining wall; and (5) constructing an isolation protection system of the railway business line. The invention has the beneficial effects that: the combined pile-raft foundation formed by combining the cast-in-situ bored piles and the profile steel is adopted to reinforce the operation activity area of the large-tonnage crawler crane, so that the bearing capacity of the foundation can be improved to the maximum extent, the foundation settlement is reduced, the adverse effect on a railway business line is reduced, and meanwhile, the profile steel positioning system is adopted, so that the profile steel can be accurately positioned, the difficulty of site construction is reduced, and the engineering quality and efficiency are improved; the steel casing retaining wall is adopted while the stress release hole is formed, so that the hole collapse phenomenon in the construction process is effectively avoided, and the hole forming quality of the stress release hole is ensured; the steel protects a section of thick bamboo and for easily assembling recoverable form, through setting up recess and tongue, adopts high strength bolt fixed, has reduced the degree of difficulty of installation with the dismantlement, and the concatenation stability is good, and the efficiency of construction is high.
Description
Technical Field
The invention belongs to the field of constructional engineering, and particularly relates to a construction method of a large-tonnage crawler crane combined type foundation.
Background
In recent years, with the rapid development of national railways, the passing amount of trains is larger and larger, the original station can not receive a plurality of trains for stopping at the same time, and the number of stations can not meet the requirement. In order to solve the problem, stations in the whole country expand original stations, and meanwhile, normal operation of station yards is guaranteed. The pedestrian overpass for crossing a plurality of railway business lines downwards usually selects a large span because of large railway traffic flow, complex surrounding environment and few selectable pier stud positions, and simultaneously, in order to ensure the normal operation of railway trains, the allowed construction time for crossing the business lines is short, and the integral hoisting mode is usually adopted.
The steel truss overpass has the advantages of large span, high section and large weight, the self weight of the crane comprises large counter weight behind the crane when hoisting, the requirement on the bearing capacity of the foundation of a large-tonnage crawler crane action activity area is higher, and the influence of settlement on a railway business line is particularly required to be noticed. The cast-in-situ bored pile has the advantages of strong adaptability to various soil layers, no vibration damage, low noise, strong bearing capacity and the like, and is widely applied to the field of building engineering. Because the distance between the operation activity area of the large-tonnage crawler crane and a railway business line is short, the construction of the cast-in-situ bored pile inevitably affects the railway business line, and in order to reduce the hyperstatic pore water pressure possibly generated in the pile foundation construction process and reduce the extrusion influence on the railway business line, a railway business line isolation protection system is urgently needed. For railway business lines, most of piled raft foundations for large-tonnage crawler crane operation are temporary structures, and need to be dismantled after hoisting technology. At present, the technologies for cutting the pile head of the cast-in-situ bored pile are relatively more, but the technologies for integrally dismantling the raft foundation of the cast-in-situ bored pile are not common, and particularly, the adverse effects of vibration, noise and the like on a railway business line are considered.
In view of this, at present, a construction method for a large-tonnage crawler crane composite foundation needs to be invented urgently, on the premise of ensuring the working safety of a crawler crane, the foundation settlement of an action activity area of the large-tonnage crawler crane is reduced as much as possible, the safety and reliability of construction are ensured, the efficiency and the quality of construction of the large-tonnage crawler crane composite foundation are improved, meanwhile, the difficulty in dismantling the on-site concrete pile-raft foundation can be effectively reduced, and the purposes of high construction speed, low construction cost and small environmental influence are achieved.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a construction method of a large-tonnage crawler crane combined foundation with high construction speed, low construction cost and small environmental influence.
The construction method of the large-tonnage crawler crane combined foundation comprises the following steps:
s1, construction preparation: raw materials are entered, checked and accepted, the field is smooth, and the field positioning and lofting are carried out;
s2, platform widening, and construction of the assembled retaining wall: dismantling the existing side slope, widening the platform by 50-60 m, and assembling and constructing the fabricated retaining wall on site;
s3, constructing an isolation protection system of the railway business line: according to the center line of the stress release hole which is lofted, excavating a shockproof ditch along the direction of the center line by using an excavator, positioning a drilling machine, constructing the stress release hole, pouring coarse sand into the stress release hole, and performing quality detection;
s4, construction of the cast-in-situ bored pile: the method comprises the following steps of constructing the cast-in-situ bored pile by adopting a slurry wall protection method, and presetting a horizontal static blasting pipe, a vertical static blasting pipe and an annular static blasting pipe in a reinforcement cage;
s5, constructing a concrete cushion layer: erecting a cushion layer side mold, presetting a horizontal static blasting pipe, pouring concrete, and curing the concrete;
s6, raft construction: constructing a waterproof layer and a waterproof layer protective layer in sequence, manufacturing and binding a reinforcement cage, presetting a horizontal static burst pipe, erecting a raft template, pouring concrete, and performing later-stage maintenance;
s7, hoisting operation of a large-tonnage crawler crane;
s8, constructing a drilling cast-in-place pile raft foundation ecological dismantling system: injecting a static blasting agent from one end of a horizontal static blasting pipe to enable the static blasting agent to fully flow into all static blasting pipes, rapidly expanding the volume after the static blasting agent is hardened, and breaking the concrete by splitting, firstly, removing a concrete cushion layer and a raft plate by using an air pick, then stripping the concrete outside a reinforcement cage, and realizing ecological removal of the bored pile-raft foundation by integrally hoisting the reinforcement cage and bonding the concrete by section steel;
s9, pile position backfilling, and leveling the field: and backfilling and compacting the dismantled bored pile-raft foundation, leveling the field, and performing engineering acceptance.
Preferably, the method comprises the following steps: the assembled retaining wall in the step S2 is composed of a prefabricated column, a shallow embedded strip foundation and an inclined strut, wherein a sandwich profiled steel sheet is arranged in the prefabricated column, extends out of the bottom of the prefabricated column for a certain distance and is inserted into a reserved groove of the shallow embedded strip foundation; the sandwich profiled steel sheet is welded with a positioning lug plate at the bottom of the prefabricated column and is fixed through an expansion bolt pre-buried in the shallow strip foundation; the prefabricated column is also provided with a connecting lug plate and is connected with the top of the inclined strut through a high-strength bolt, and the bottom of the inclined strut is hinged on the fixed support.
Preferably, the method comprises the following steps: the railway business line isolation protection system comprises a shockproof ditch and a stress release hole, wherein the shockproof ditch is arranged in parallel to the railway business line, the width of the shockproof ditch is 1.5-1.8 m, and the depth of the shockproof ditch is 0.8-1.0 m; the stress release hole adopts an easily assembled and recyclable steel casing retaining wall, and is formed into a pile by pouring medium coarse sand; the stress release holes are arranged in the shockproof ditch, the distance between the stress release holes parallel to the direction of the railway business line is 1.0-1.2 m, the distance between the stress release holes perpendicular to the direction of the railway business line is 0.5-0.6 m, and the stress release holes are arranged in a quincunx shape.
Preferably, the method comprises the following steps: s3, sinking the stress release hole in the railway business line isolation protection system into the steel casing retaining wall in the hole forming process, after the hole forming is completed, filling sand through a steel sleeve with a valve pile tip, simultaneously pulling out the steel casing section by section, and gradually compacting the medium coarse sand into a pile; the steel casing in the isolation protection system of the railway business line is formed by splicing a plurality of segmented steel casing units, the top and the bottom of any one segment of steel casing unit are mutually crossed to form a groove and a convex groove, the groove and the convex groove at the bottom end of the upper segment of steel casing are respectively and accurately embedded with the convex groove and the groove at the top end of the lower segment of steel casing, and lug plates arranged in the groove and the convex groove are fixedly connected through high-strength bolts; and a hanging ring is welded at the top of each section of steel casing unit.
Preferably, the method comprises the following steps: step S4, the pile top of the cast-in-situ bored pile penetrates through the concrete cushion layer, and the thickness of the raft entering the pile is not less than 100 mm; the cast-in-situ bored pile is a combined pile of reinforced concrete and profile steel, a reinforcement cage is arranged in the cast-in-situ bored pile, the reinforcement cage comprises a main reinforcement, a stiffening hoop and a stirrup, and a stirrup encryption area is arranged in the pile top area of the cast-in-situ bored pile; the section steel is welded H-shaped steel.
Preferably, the method comprises the following steps: s4, positioning the section steel in the cast-in-situ bored pile through a section steel positioning system formed by combining a steel casing and a steel plate, wherein the section steel positioning system is fixed at an orifice of the cast-in-situ bored pile and is made to be horizontal; a plurality of cylinder protection lug plates are welded at the top and the bottom of the steel cylinder, holes are reserved at corresponding positions of the steel plate, and the steel cylinder and the steel plate are fixedly positioned through high-strength bolts; the steel plate of steel casing top and bottom all reserves the shaped steel hole that matches with the shaped steel size, and the position in two shaped steel holes aligns, inserts shaped steel in the bored concrete pile through the hoist and mount.
Preferably, the method comprises the following steps: and S5, adopting plain concrete as the concrete cushion layer, wherein the thickness of the plain concrete cushion layer is 100-150 mm.
Preferably, the method comprises the following steps: and S6, the raft is of a reinforced concrete structure, the thickness of the raft is 600-700 mm, and the thickness of the concrete protection layer of the reinforcing steel bar is not less than 50 mm.
Preferably, the method comprises the following steps: step S8, the ecological demolition system for the bored pile-pile raft foundation comprises a horizontal static blasting tube, a vertical static blasting tube and an annular static blasting tube, wherein two ends of the horizontal static blasting tube and the vertical static blasting tube are open, one end of the annular static blasting tube is connected with the vertical static blasting tube, and the other end of the annular static blasting tube is the closed end of the annular static blasting tube; the horizontal static blasting pipe is provided with a three-way pipe and is communicated with the vertical static blasting pipe; the horizontal static blasting pipe, the vertical static blasting pipe and the annular static blasting pipe are all uniformly provided with a plurality of static blasting agent seepage holes along the length direction of the pipes; before concrete pouring of the cast-in-situ bored pile, fixing a plurality of groups of vertical static blasting pipes and annular static blasting pipes by taking a reinforcement cage as a support, extending the vertical static blasting pipes out of the pile head of the cast-in-situ bored pile by a certain length, and sealing for protection; after the construction of the cast-in-situ bored pile is completed, a plurality of horizontal static blasting pipes are uniformly arranged in the concrete cushion and the raft in three spatial directions in sequence, and the vertical static blasting pipes are fixedly connected with the horizontal static blasting pipes.
Preferably, the method comprises the following steps: s8, uniformly arranging vertical static blasting tubes in the ecological demolition system of the bored pile-raft foundation along the inner side of the reinforcement cage, binding and fixing the bottoms of the vertical static blasting tubes and annular static blasting tubes through curved connectors, uniformly arranging the annular static blasting tubes along the length direction of the reinforcement cage, and placing the annular static blasting tubes tightly attached to the outer side of the reinforcement cage in parallel; the static blasting agent seepage holes are wound and sealed by rubber belts to form a sealing layer, and after all the static blasting agent seepage holes are sealed, an annular tubular protective sleeve is sleeved on the outer side of the sealing layer; the protective sleeve is made of leather materials.
The invention has the beneficial effects that:
(1) the combined pile-raft foundation combining the cast-in-situ piles and the profile steel is adopted to reinforce the operation activity area of the large-tonnage crawler crane, so that the bearing capacity of the foundation can be improved to the maximum extent, the foundation settlement is reduced, the adverse effect on a railway business line is reduced, meanwhile, the profile steel positioning system is adopted, the profile steel can be accurately positioned, the difficulty of site construction is reduced, and the engineering quality and the engineering efficiency are improved.
(2) According to the invention, the steel casing is adopted to protect the wall while forming the stress release hole, so that the hole collapse phenomenon in the construction process is effectively avoided, and the hole forming quality of the stress release hole is ensured; the steel casing is easy to assemble and recycle, and is fixed by high-strength bolts through the arrangement of the grooves and the convex grooves, so that the difficulty in assembly and disassembly is reduced, the splicing stability is good, and the construction efficiency is high; the top end of each section of steel casing unit is provided with a hanging ring, so that the steel casing can be conveniently pulled out for reuse, and the steel casing unit has the advantages of economy, high efficiency and environmental protection.
(3) According to the invention, the static blasting pipes distributed in a spatial net shape are pre-embedded in the bored pile, the concrete cushion and the raft plate, so that the integral structure of the raft foundation of the bored pile is quickly and synchronously dismantled, the construction efficiency is high, and the construction period is effectively shortened; the static blasting pipe is adopted, so that the expansion damage of concrete is realized, the problems of vibration, noise pollution and the like caused by methods such as blasting and the like are avoided, and the method is a safe green environment-friendly dismantling method.
Drawings
FIG. 1 is a flow chart of the construction process of the present invention;
FIG. 2 is a layout view of a composite foundation of a large-tonnage crawler crane;
FIG. 3 is a schematic illustration of a stress release hole for hole-forming sand-filling;
FIG. 4 is a schematic view of an assembled steel casing connection;
FIG. 5 is a schematic diagram of the arrangement of a bored pile-raft composite foundation and a static pipe burst;
FIG. 6 is a greatly enlarged view of section A-A in FIG. 5;
FIG. 7 is a schematic view of a static booster configuration and connections;
FIG. 8 is a greatly enlarged cross-sectional view taken along line B-B in FIG. 7;
FIG. 9 is a schematic view of a section steel positioning system;
fig. 10 is a schematic view of an assembled retaining wall protective structure.
Description of reference numerals: 1-railway business line, 2-large-tonnage crawler crane operation activity area, 3-drilling cast-in-place pile, 4-existing slope, 5-shockproof ditch, 6-stress release hole, 7-steel sleeve, 8-valve pile tip, 9-steel casing, 10-medium coarse sand, 11-feed inlet, 12-upper section steel casing, 13-lower section steel casing, 14-groove, 15-tongue, 16-high-strength bolt, 17-lifting ring, 18-concrete cushion, 19-raft, 20-reinforcement cage, 21-main reinforcement, 22-stiffening hoop, 23-stirrup, 24-stirrup encryption area, 25-horizontal static explosion pipe, 26-vertical static explosion pipe, 27-annular static explosion pipe, 28-concrete, 29-section steel, concrete, 30-curved connector, 31-closed end of annular static blasting tube, 32-static blasting agent seepage hole, 33-sealing layer, 34-protective sleeve, 35-steel plate, 36-shaped steel hole, 37-barrel-protecting ear plate, 38-prefabricated column, 39-sandwich profiled steel plate, 40-positioning ear plate, 41-expansion bolt, 42-shallow strip foundation, 43-diagonal brace, 44-connecting ear plate, 45-fixed support and 46-soil body.
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, the construction method of the large-tonnage crawler crane composite foundation comprises the following construction steps:
s1, construction preparation: raw materials are entered, checked and accepted, the field is smooth, and the field positioning and lofting are carried out;
s2, platform widening, and construction of the assembled retaining wall: dismantling the existing side slope 4, widening the platform by 50-60 m, and assembling and constructing the fabricated retaining wall on site;
s3, constructing an isolation protection system of the railway business line: according to the center line of the stress release hole 6 which is lofted, excavating a shockproof ditch 5 along the direction of the center line by using an excavator, positioning a drilling machine, constructing the stress release hole 6, pouring coarse sand 10 into the stress release hole 6, and performing quality detection;
s4, construction of the cast-in-situ bored pile 3: the cast-in-situ bored pile 3 is constructed by adopting a slurry wall protection method, and a horizontal static blasting pipe 25, a vertical static blasting pipe 26 and an annular static blasting pipe 27 are arranged in the reinforcement cage 20 in advance;
s5, construction of the concrete cushion 18: erecting a cushion layer side mold, presetting a horizontal static blasting pipe 25, pouring concrete 28, and curing the concrete 28;
s6, constructing a raft 19: constructing a waterproof layer and a waterproof layer protective layer in sequence, manufacturing and binding a reinforcement cage, presetting a horizontal static burst pipe 25, erecting a raft template, pouring concrete 28, and performing later maintenance;
s7, hoisting operation of a large-tonnage crawler crane;
s8, drilling and pouring pile raft foundation ecological dismantling system: static blasting agents are injected from one end of the horizontal static blasting pipes 25 and fully flow into all the static blasting pipes, the static blasting agents rapidly expand in volume after hardening, concrete 28 is broken in a splitting mode, a pneumatic pick is used for removing the concrete cushion layer 18 and the raft 19, then the concrete 28 on the outer side of the reinforcement cage 20 is peeled off, and the reinforcement cage is integrally hoisted and the section steel is bonded with the concrete, so that ecological removal of the bored pile-raft foundation is achieved.
S9, pile position backfilling, and leveling the field: and backfilling and compacting the dismantled bored pile-raft foundation, leveling the field, and performing engineering acceptance.
The assembled retaining wall in the step S2 is composed of prefabricated columns 38, shallow embedded strip foundations 42 and inclined struts 43, wherein sandwich profiled steel sheets 39 are arranged in the prefabricated columns 38, and the sandwich profiled steel sheets 39 extend out of the bottoms of the prefabricated columns 38 for a certain distance and are inserted into the reserved grooves of the shallow embedded strip foundations 42; the sandwich profiled steel sheet 39 is welded with a positioning ear plate 40 at the bottom of the prefabricated column 38 and is fixed by an expansion bolt 41 pre-buried in a shallow strip foundation 42; the precast column 38 is further provided with a connecting lug plate 44 which is connected with the top of the inclined strut 43 through the high-strength bolt 16, and the bottom of the inclined strut 43 is hinged on a fixed support 45, so that the precast column 38 is reliably supported.
The railway business line isolation protection system comprises a shockproof ditch 5 and a stress release hole 6, wherein the shockproof ditch 5 is arranged in parallel to the railway business line 1, the width of the shockproof ditch 5 is 1.5-1.8 m, and the depth of the shockproof ditch is 0.8-1.0 m; the stress release hole 6 adopts an easily assembled and recyclable steel casing retaining wall and is formed into a pile by pouring medium coarse sand 10; the stress release holes 6 are arranged in the shockproof ditch 5, the distance between the stress release holes 6 parallel to the direction of the railway business line 1 is 1.0-1.2 m, the distance between the stress release holes 6 perpendicular to the direction of the railway business line 1 is 0.5-0.6 m, and 3 rows of the stress release holes 6 parallel to the direction of the railway business line 1 are arranged in a quincunx shape.
The stress release hole 6 sinks into the steel casing 9 to protect the wall in the hole forming process, after the hole forming is completed, sand filling is carried out through the steel casing 7 with the valve pile tip 8, meanwhile, the steel casing 9 is pulled out section by section, and the medium coarse sand 10 is gradually compacted to form a pile. The upper part of the steel sleeve 7 is provided with a feed inlet 11.
The steel protect a section of thick bamboo 9 protect a section of thick bamboo unit concatenation by the steel of a plurality of merogenesis to form, the top and the bottom intercrossing of an arbitrary section of steel protect a section of thick bamboo unit set up recess 14 and tongue 15, the recess 14 and the tongue 15 of upper segment steel protect a 12 bottom respectively with the tongue 15 and the accurate gomphosis of recess 14 on lower segment steel protect a 13 top to carry out fixed connection through high strength bolt to the otic placode that sets up in recess 14 and tongue 15.
And a hanging ring 17 is welded at the top of each section of steel casing unit in the steel casing 9 so as to pull out the steel casing for recycling.
Step S4, the pile top of the cast-in-situ bored pile 3 penetrates through the concrete cushion 18, and the thickness of the pile top entering the raft 19 is not less than 100 mm; the cast-in-situ bored pile 3 is a combined pile of reinforced concrete and profile steel 29, wherein the concrete is C30 concrete, a reinforcement cage 20 is arranged in the cast-in-situ bored pile 3, the reinforcement cage 20 comprises a main reinforcement 21, a stiffening hoop 22 and a stirrup 23, and a stirrup encryption area 24 is arranged in the pile top area of the cast-in-situ bored pile 3 so as to improve the bearing capacity of the cast-in-situ bored pile 3; the section steel 29 is welded H-shaped steel.
The section steel 29 is positioned by a section steel positioning system formed by combining the steel casing 9 and the steel plate 35, and the section steel positioning system is fixed at the orifice of the cast-in-situ bored pile 3 and ensures the level of the cast-in-situ bored pile; a plurality of pile casing ear plates 37 are welded at the top and the bottom of the steel pile casing 9, holes are reserved at corresponding positions of the steel plate 35, and the steel pile casing ear plates are fixedly positioned through high-strength bolts 16; the steel plate 35 at the top and the bottom of the steel casing 9 is reserved with the steel section holes 36 matched with the steel section 29 in size, the position of the two steel section holes 36 is accurately aligned, and the steel section 29 is inserted into the cast-in-situ bored pile 3 through hoisting.
Step S5, the concrete cushion 18 is made of plain concrete and has a thickness of 100-150 mm.
Step S6, the raft 19 is of a reinforced concrete structure, the thickness of the raft is 600-700 mm, and the thickness of the concrete protection layer of the reinforcing steel bar is not less than 50 mm.
Step S8, the ecological demolition system for the bored pile-pile raft foundation comprises a horizontal static blasting tube 25, a vertical static blasting tube 26 and an annular static blasting tube 27, wherein two ends of the horizontal static blasting tube 25 and the vertical static blasting tube 26 are open, one end of the annular static blasting tube 27 is connected with the vertical static blasting tube 26, and the other end of the annular static blasting tube 27 is an annular static blasting tube closed end 31; the horizontal static blasting pipe 25 is provided with a three-way pipe and can be communicated with the vertical static blasting pipe 26; the horizontal static blasting tube 25, the vertical static blasting tube 26 and the annular static blasting tube 27 are all uniformly provided with a plurality of static blasting agent seepage holes 32 along the tube length direction;
before the concrete 28 of the cast-in-situ bored pile 3 is poured, a plurality of groups of vertical static blasting pipes 26 and annular static blasting pipes 27 are fixed by taking the reinforcement cage 20 as a support, and the vertical static blasting pipes 26 extend out of the pile head of the cast-in-situ bored pile 3 for a certain length and are sealed for protection;
after the construction of the cast-in-situ bored pile 3 is completed, a plurality of horizontal static blasting pipes 25 are uniformly arranged in the concrete cushion 18 and the raft 19 in three spatial directions in sequence, and the vertical static blasting pipes 26 are connected and fixed with the horizontal static blasting pipes 25;
when the bored pile-pile raft foundation needs to be dismantled, the static blasting agent is injected from one end of the horizontal static blasting tube 25, so that the static blasting agent fully flows into all the static blasting tubes. After a certain time, the static blasting agent begins to harden, the volume rapidly expands, the concrete is broken in a splitting way and separated from the reinforcement cage, and the ecological dismantling of the bored pile-raft foundation is realized by integrally hoisting the reinforcement cage and the profile steel bonded concrete.
Vertical quiet pipe 26 that explodes evenly arrange along the inboard certain interval of steel reinforcement cage 20, vertical quiet pipe 26 bottom of exploding passes through curved shape connector 30 ligature with annular quiet pipe 27 that explodes fixedly, annular quiet pipe 27 that explodes evenly arranges along 20 length direction of steel reinforcement cage, and annular quiet pipe 27 that explodes hugs closely the parallel placement in the steel reinforcement cage 20 outside.
The static explosive seepage holes 32 are wound and sealed by rubber belts to form a sealing layer 33, and after all the static explosive seepage holes 32 are sealed, an annular tubular protective sleeve 34 is sleeved on the outer side of the sealing layer 33 to protect the sealing layer 33; the protective sleeve 34 may be made of leather-like material such as a tire tube.
Claims (8)
1. A construction method of a large-tonnage crawler crane combined type foundation is characterized by comprising the following steps: the method comprises the following construction steps:
s1, construction preparation: raw materials are entered, checked and accepted, the field is smooth, and the field positioning and lofting are carried out;
s2, platform widening, and construction of the assembled retaining wall: dismantling the existing side slope (4), widening the platform by 50-60 m, and assembling and constructing the fabricated retaining wall on site;
s3, constructing an isolation protection system of the railway business line: according to the center line of the stress release hole (6) which is lofted, an excavator is used for digging a shockproof ditch (5) along the direction of the center line, a drilling machine is positioned, the stress release hole (6) is constructed, coarse sand (10) is poured into the stress release hole (6), and quality detection is carried out;
s4, construction of the cast-in-situ bored pile (3): the method comprises the following steps of constructing the cast-in-situ bored pile (3) by adopting a mud wall protection method, and presetting a horizontal static blasting pipe (25), a vertical static blasting pipe (26) and an annular static blasting pipe (27) in a reinforcement cage (20);
s5, constructing a concrete cushion (18): erecting a cushion layer side mold, presetting a horizontal static blasting pipe (25), pouring concrete (28), and curing the concrete (28);
s6, raft plate (19) construction: constructing a waterproof layer and a waterproof layer protective layer in sequence, manufacturing and binding a reinforcement cage, presetting a horizontal static burst pipe (25), erecting a raft template, pouring concrete (28), and performing later-stage maintenance;
s7, hoisting operation of a large-tonnage crawler crane;
s8, constructing a drilling cast-in-place pile raft foundation ecological dismantling system: static blasting agents are injected from one end of a horizontal static blasting pipe (25) and fully flow into all the static blasting pipes, the static blasting agents rapidly expand in volume after hardening, concrete (28) is broken in a splitting mode, firstly, a pneumatic pick is adopted to remove a concrete cushion layer (18) and a raft (19), then, the concrete (28) on the outer side of a reinforcement cage (20) is peeled off, and the reinforcement cage is integrally hoisted and concrete is bonded by profile steel, so that ecological removal of the raft foundation of the bored pile is realized;
s9, pile position backfilling, and leveling the field: and backfilling and compacting the dismantled bored pile-raft foundation, leveling the field, and performing engineering acceptance.
2. The construction method of the large-tonnage crawler crane combined type foundation according to claim 1, characterized in that: the assembled retaining wall in the step S2 is composed of prefabricated columns (38), shallow embedded strip foundations (42) and inclined struts (43), wherein sandwich profiled steel plates (39) are arranged in the prefabricated columns (38), and the sandwich profiled steel plates (39) extend out of the bottoms of the prefabricated columns (38) for a certain distance and are inserted into reserved grooves of the shallow embedded strip foundations (42); the sandwich profiled steel sheet (39) is welded with a positioning ear plate (40) at the bottom of the prefabricated column (38) and is fixed through an expansion bolt (41) pre-buried in a shallow strip foundation (42); the prefabricated column (38) is also provided with a connecting lug plate (44) and is connected with the top of an inclined strut (43) through a high-strength bolt (16), and the bottom of the inclined strut (43) is hinged on a fixed support (45).
3. The construction method of the large-tonnage crawler crane combined type foundation according to claim 1, characterized in that: the railway business line isolation protection system comprises a shockproof ditch (5) and a stress release hole (6), wherein the shockproof ditch (5) is arranged in parallel to the railway business line (1), the width of the shockproof ditch (5) is 1.5-1.8 m, and the depth of the shockproof ditch is 0.8-1.0 m; the stress release hole (6) adopts an easily assembled and recyclable steel casing retaining wall, and is formed into a pile by pouring medium coarse sand (10); the stress release holes (6) are arranged in the shockproof ditch (5), the distance between the stress release holes (6) in the direction parallel to the railway business line (1) is 1.0-1.2 m, the distance between the stress release holes (6) in the direction perpendicular to the railway business line (1) is 0.5-0.6 m, and the stress release holes (6) are arranged in a quincunx shape.
4. The construction method of the large-tonnage crawler crane combined type foundation according to claim 3, characterized in that: s3, sinking a stress release hole (6) in the railway business line isolation protection system into a steel casing (9) to protect the wall in the hole forming process, after hole forming is completed, filling sand through a steel casing (7) with a valve pile tip (8), simultaneously pulling out the steel casing (9) section by section, and gradually compacting medium coarse sand (10) to form a pile; the steel protecting cylinder (9) in the railway business line isolation protection system is formed by splicing a plurality of segmented steel protecting cylinder units, the top and the bottom of any one segment of steel protecting cylinder unit are mutually crossed to form a groove (14) and a convex groove (15), the groove (14) and the convex groove (15) at the bottom end of an upper segment of steel protecting cylinder (12) are respectively and accurately embedded with the convex groove (15) and the groove (14) at the top end of a lower segment of steel protecting cylinder (13), and ear plates arranged in the groove (14) and the convex groove (15) are fixedly connected through high-strength bolts; the top of each section of steel casing unit is welded with a hanging ring (17).
5. The construction method of the large-tonnage crawler crane combined type foundation according to claim 1, characterized in that: step S4, the pile top of the cast-in-situ bored pile (3) penetrates through the concrete cushion (18), and the thickness of the pile top entering the raft (19) is not less than 100 mm; the cast-in-situ bored pile (3) is a combined pile of reinforced concrete and section steel (29), a reinforcement cage (20) is arranged in the cast-in-situ bored pile (3), the reinforcement cage (20) comprises a main reinforcement (21), a stiffening hoop (22) and a stirrup (23), and a stirrup encryption area (24) is arranged in the pile top area of the cast-in-situ bored pile (3); the section steel (29) adopts welded H-shaped steel.
6. The construction method of the large-tonnage crawler crane combined type foundation according to claim 5, characterized in that: s4, positioning the section steel (29) in the cast-in-situ bored pile (3) through a section steel positioning system formed by combining a steel casing (9) and a steel plate (35), wherein the section steel positioning system is fixed at an orifice of the cast-in-situ bored pile (3) and is made to be horizontal; a plurality of pile casing lug plates (37) are welded at the top and the bottom of the steel pile casing (9), holes are reserved at corresponding positions of the steel plate (35), and the steel pile casing (9) and the steel plate (35) are fixedly positioned through high-strength bolts (16); the steel plates (35) at the top and the bottom of the steel casing (9) are reserved with steel section holes (36) matched with the sizes of the steel sections (29), the positions of the two steel section holes (36) are aligned, and the steel sections (29) are inserted into the cast-in-situ bored pile (3) through hoisting.
7. The construction method of the large-tonnage crawler crane combined type foundation according to claim 1, characterized in that: and S5, adopting plain concrete for the concrete cushion (18) and enabling the thickness to be 100-150 mm.
8. The construction method of the large-tonnage crawler crane combined type foundation according to claim 1, characterized in that: and S6, the raft (19) is of a reinforced concrete structure, the thickness of the raft is 600-700 mm, and the thickness of the concrete protective layer of the reinforcing steel bar is not less than 50 mm.
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| CN103388341B (en) * | 2013-07-29 | 2015-06-17 | 江苏翔森建设工程有限公司 | Large-sized piled raft foundation structure and construction method |
| CN105672348A (en) * | 2016-01-27 | 2016-06-15 | 重庆大学 | Construction method for cropping bridge pile foundation at sandy gravel stratum of abyssal region |
| CN106049196B (en) * | 2016-06-08 | 2018-04-06 | 杭州江润科技有限公司 | Flexible pile combines ballastless track roadbed construction method with stake raft with section |
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