CN109371901B - Pile bearing type retaining wall of cofferdam in dry period and construction method - Google Patents
Pile bearing type retaining wall of cofferdam in dry period and construction method Download PDFInfo
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- CN109371901B CN109371901B CN201811495576.4A CN201811495576A CN109371901B CN 109371901 B CN109371901 B CN 109371901B CN 201811495576 A CN201811495576 A CN 201811495576A CN 109371901 B CN109371901 B CN 109371901B
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- 238000010276 construction Methods 0.000 title claims abstract description 103
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 110
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 66
- 239000010959 steel Substances 0.000 claims abstract description 66
- 239000004567 concrete Substances 0.000 claims abstract description 52
- 239000011150 reinforced concrete Substances 0.000 claims description 36
- 238000009415 formwork Methods 0.000 claims description 21
- 239000002689 soil Substances 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 16
- 239000004744 fabric Substances 0.000 claims description 14
- 239000004568 cement Substances 0.000 claims description 13
- 239000004575 stone Substances 0.000 claims description 10
- 238000005192 partition Methods 0.000 claims description 9
- 239000011435 rock Substances 0.000 claims description 9
- 238000012876 topography Methods 0.000 claims description 9
- 238000005507 spraying Methods 0.000 claims description 7
- 238000011144 upstream manufacturing Methods 0.000 claims description 7
- 230000001681 protective effect Effects 0.000 claims description 4
- 238000009412 basement excavation Methods 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 230000000284 resting effect Effects 0.000 claims 2
- 238000009435 building construction Methods 0.000 claims 1
- 238000005056 compaction Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000005728 strengthening Methods 0.000 description 4
- 238000005553 drilling Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 210000002105 tongue Anatomy 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/06—Moles; Piers; Quays; Quay walls; Groynes; Breakwaters ; Wave dissipating walls; Quay equipment
- E02B3/066—Quays
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/16—Sealings or joints
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/02—Restraining of open water
- E02D19/04—Restraining of open water by coffer-dams, e.g. made of sheet piles
Abstract
The invention discloses a dry-period cofferdam pile-bearing type retaining wall and a construction method thereof. The invention also discloses a construction method of the cofferdam pile bearing type retaining wall in the dry period, which mainly comprises the following steps: the construction method comprises the following steps of construction arrangement, cofferdam filling, island building compaction, high-pressure jet anti-seepage wall construction, prefabricated bearing platforms, prefabricated cast-in-place concrete retaining wall forming templates, separated steel retaining cylinders, stable steel retaining cylinders, cast-in-place pile construction, prefabricated bearing platforms, prefabricated retaining wall forming templates, cast-in-place concrete retaining wall construction, prefabricated retaining plates and water retaining plates.
Description
Technical Field
The invention belongs to the technical field of water conservancy and hydropower foundation construction, and particularly relates to a dry cofferdam pile-supported retaining wall and a construction method thereof.
Background
In the whole hydraulic engineering, the cofferdam is a temporary building for providing permanent service, the main purpose of constructing the cofferdam is to drain water and soil for the constructed site, the surface is drilled for water and soil reasons, and the subsequent engineering construction is also facilitated, so that the cofferdam construction must be carried out in the construction process by combining the actual conditions and considering the reasons of the height of the water level, the geological conditions, the temperature, the climate and the like.
In the construction of the place with the flood season, the design of the cofferdam is considered, and the time point of the cofferdam construction and the efficiency and the speed of the construction are also important. If the quality of the construction platform at the cofferdam is poor, the later main body construction is influenced; if the construction speed is too low, the cofferdam construction or the foundation construction can not be completed in the dry season, and the influence on the construction and the engineering quality in the later period can be brought. In addition, the island-building cofferdam is generally filled with earth and stones, and a cast-in-place pile is difficult to form and form, so that the condition of poor pile-forming quality is often caused.
Aiming at the situations of urgent construction period of the water conservancy and hydropower foundation, insufficient quality of a cast-in-place pile and the like, a simple and effective method for constructing the dry-period cofferdam needs to be invented, so that the construction flow is simplified, the construction efficiency is improved, the construction progress is accelerated, the quality of foundation construction is guaranteed, resources can be saved, and construction waste is reduced.
Disclosure of Invention
The invention aims to provide a dry-period cofferdam pile-supported retaining wall and a construction method thereof, which can overcome the defects of large construction period, poor construction quality and the like of water conservancy and hydropower foundation construction engineering quantity, ensure the convenience and economy of construction, improve the construction quality, accelerate the construction speed and have good economic and technical benefits.
In order to achieve the aim, the main technical solution of the invention is to provide a dry-period cofferdam pile-supported retaining wall, which comprises a retaining wall component, a block stone protective surface, a pile foundation island construction platform and a water retaining component which are all arranged on an original site shape line, the retaining wall component comprises a rock-socketed pile, a pile foundation bearing platform and a concrete retaining wall which are sequentially connected from bottom to top, the pile that inlays sets up in former topography line, the manger plate subassembly is including setting up high-pressure jet impervious wall, prefabricated breakwater and earth and rockfill cofferdam, and high-pressure jet impervious wall sets up on former topography line, and prefabricated breakwater sets up on the high-pressure jet impervious wall, forms the earth and rockfill cofferdam through the cofferdam filling on the former topography line, promotes former topography line to construction requirement elevation, forms pile foundation island construction platform, and the earth and rockfill cofferdam is near high-pressure jet impervious wall, and pile foundation island construction platform sets up the side of meeting water at the concrete barricade, and the setting of rock block mask is in the side of being shaded from the water of concrete barricade.
The pile foundation bearing platform is a pile foundation fabricated prefabricated bearing platform and comprises a plurality of fabricated prefabricated bearing platforms which are connected end to end, bearing platform connecting holes are formed between the adjacent fabricated prefabricated bearing platforms through bearing platform connecting side plates in a connecting mode, bearing platform connecting reserved ribs are preset in the fabricated prefabricated bearing platforms, a pile top stripping pile core is connected to the top of a rock-embedded pile, a pile top pre-embedded high-strength connecting rib penetrating through the pile top stripping pile core is preset in the rock-embedded pile, the bearing platform connecting reserved ribs are anchored through bearing platform connecting partition plates and connected with the pile top pre-embedded high-strength connecting ribs, the pile foundation bearing platform is placed on the diameter expansion of the top of a pile body, the pile top stripping pile core is inserted into the bearing platform connecting holes, and grouting bodies are filled in the bearing platform connecting holes.
The prefabricated water baffle comprises prefabricated reinforced concrete water baffles and steel truss assembled water baffles, the reinforced concrete water baffles are bolted through horizontal tongues and grooves of the water baffles, the reinforced concrete water baffles are bolted with water baffle bottom plates through vertical tongues and grooves of the water baffles, the water baffle bottom plates are connected with cement soil plates at the tops of the impervious walls through pre-buried fixed ground anchors, the backwater side of the reinforced concrete water baffle is reinforced by a water baffle rib column and an oblique brace rod, the water baffle rib column is fixedly connected with the reinforced concrete water baffle and the water baffle bottom plate, two ends of the oblique brace rod are fixedly connected with the reinforced concrete water baffle and a cement soil slab on the top of the impervious wall respectively, the reinforced concrete water baffle is characterized in that an external integral waterproof cloth is arranged on the upstream face of the reinforced concrete water baffle, a water-swelling rubber strip is bonded at the vertical rabbet of the water baffle, an anti-seepage rubber strip is bonded at the bottom plate of the water baffle, and a water-swelling rubber strip is arranged at the horizontal rabbet of the water baffle at the joint of the reinforced concrete water baffle.
The water baffle is assembled to steel truss includes steel truss, truss PMKD, truss symmetrical ballast weight, truss curb plate and the whole waterproof cloth of external roll-up formula, truss PMKD is connected to the steel truss bottom, truss PMKD anchor in impervious wall top cement soil plate upper portion, a truss symmetrical ballast weight has all been placed to the steel truss both sides, and the steel truss center is provided with the vertical pull rod of truss prestressing force, the truss curb plate all sets up in the steel truss side of facing water with the whole waterproof cloth of external roll-up formula, and truss curb plate surface scribbles the coiled material waterproof layer.
The invention also discloses a construction method of the cofferdam pile bearing type retaining wall in the dry period, which comprises the following steps:
1) construction arrangement: in the design range, preparing hydropower, tools and materials required by construction and cofferdam filling soil and stones, and making construction safety and environmental protection measures;
2) filling a cofferdam: on an original site shape line, directly transporting the cofferdam from an excavation area to a cofferdam backfilling part by a dumper, and constructing in layers, wherein the cofferdam filling engineering quantity is mainly concentrated on the water facing side of the concrete retaining wall and is accounted from one of the upstream end and the downstream end or is accounted from the upstream end and the downstream end in opposite directions according to site conditions;
3) building an island and compacting: the leveling material is constructed by a bulldozer and is compacted by vibration rolling, and the slope is trimmed by a back shovel assisted with manual work, so that the slope is smooth;
4) and (3) high-pressure jet anti-seepage wall construction: constructing each rotary spraying hole of the high-pressure jet anti-seepage wall in sequence, dividing the construction into wall sections, and then connecting the wall sections into a whole wall;
5) pile foundation bearing platform construction: prefabricating a plurality of prefabricated bearing platforms which are preset with bearing platform connection reserved ribs according to design requirements, and then connecting to form a pile foundation bearing platform;
6) prefabricating a cast-in-place concrete retaining wall regularization template: prefabricating a cast-in-place concrete retaining wall stereotyped template according to design requirements;
7) and (3) rock-socketed pile construction: placing a separated steel casing at the position of a pile foundation required by the design of an original topographic line, embedding a fixed positioning rod in the center of the separated steel casing, arranging a movable bottom plate and a bottom plate lifting rod of the casing in the separated steel casing, and then placing a string rod precast block in the separated steel casing to press and keep the weight stable; pulling out the bottom plate lifting rod and the weight of the protective cylinder movable bottom plate and the string rod precast block connected with the bottom plate lifting rod, and pouring concrete;
8) installing and constructing a pile foundation bearing platform: the pile foundation bearing platform is assembled on the rock-socketed pile, the pile top stripped pile core is inserted into the bearing platform connecting hole, and then the bearing platform connecting hole is filled with a grouting body to realize connection and fixation;
9) and (3) construction of a cast-in-place concrete retaining wall: placing a cast-in-place concrete retaining wall stereotyped template on a pile foundation bearing platform, pouring concrete, then transferring the cast-in-place concrete retaining wall stereotyped template to the lower retaining wall position through a template traction mechanism, and pouring concrete again until the construction of the whole retaining wall is completed;
10) prefabricating a water baffle: according to the hydrogeological condition and the water level condition of a construction site, selecting an assembled reinforced concrete water baffle or a steel truss assembled water baffle, and prefabricating;
11) placing a water baffle: and placing the water baffle and assembling the water baffle to the required elevation and length according to the design requirement.
Cast-in-place concrete barricade regularization template includes that the barricade regularization is strengthened the side form, the barricade is opened and close formula end mould, the adjustable brace that pulls at the template top, vertical framed bent and template drive mechanism are supported to the side form, two barricades regularization are strengthened the side form and are connected respectively and constitute the template main part at the adjustable brace both ends that pulls at the template top, the barricade is opened and close formula end mould and is set up at template main part both ends, template main part both sides all are equipped with one side mould and support vertical framed bent and be used for supporting the barricade regularization and strengthen the side form, pile foundation is equipped with the cushion cap on the cushion cap and.
The template traction mechanism comprises a template traction frame, a template mounting and dismounting assembly, a side mold sliding rail is arranged on a pile foundation bearing platform on two sides of the vertical power assembly and the template main body, the template mounting and dismounting assembly comprises a horizontal jacking assembly and a horizontal demoulding assembly which are arranged at two ends of the template main body, the horizontal jacking assembly comprises a horizontal jacking jack backboard which is arranged on the pile foundation bearing platform and is connected with the horizontal jacking jack, the horizontal demoulding assembly comprises a horizontal demoulding jack backboard and a horizontal demoulding jack backboard, the vertical power assembly comprises a vertical jack which is arranged on the pile foundation bearing platform and is used for shelving the vertical jack of the template main body which can be jacked and is arranged in the base and the vertical jack, the template traction frame covers the template main body and is connected with the template main body through a steel wire rope. The jack backplate provides the counter-force and outwards draws the steel mould, and the help drawing of patterns can prevent to damage the concrete at drawing of patterns in-process.
And 5) connecting a plurality of prefabricated bearing platforms end to end, connecting adjacent prefabricated bearing platforms through bearing platform connecting side plates and forming bearing platform connecting holes, anchoring the reserved bearing platform connecting ribs through bearing platform connecting partition plates and connecting pile top embedded high-strength connecting ribs, inserting pile top stripping pile cores into the bearing platform connecting holes, and filling grout into the bearing platform connecting holes.
The invention has the following characteristics and beneficial effects:
(1) the prefabricated bearing platform and the prefabricated concrete retaining wall forming template are prefabricated during cofferdam filling operation, the prefabricated bearing platform can be directly assembled without waiting for 28 days after the cast-in-place pile construction is finished, and the construction period is greatly shortened.
(2) In the earth-rock cofferdam foundation, a separated steel pile casing is placed, and the position of the pile foundation is stabilized by using a separated steel pile casing system, so that the quality of the pile foundation is ensured.
(3) Two alternatives are provided at the prefabricated breakwater: the assembled reinforced concrete water baffle and the steel truss assembled water baffle replace the traditional bagged soil and stone water baffle, the condition of high water level expansion can be effectively dealt with, and the construction environment is ensured.
Drawings
FIG. 1 is a schematic view of a pile-supported retaining wall and a construction platform of the dry-period cofferdam of the present invention;
FIG. 2 is a schematic view of a split pile casing of the present invention;
FIG. 3 is a schematic view of an assembled prefabricated pile foundation cap of the present invention;
FIG. 4 is a schematic view of the assembled prefabricated cap of the present invention;
FIG. 5 is a schematic view of a shaped form for a pile-supported cast-in-place concrete retaining wall according to the present invention;
FIG. 6 is a schematic view illustrating a prefabricated reinforced concrete breakwater according to the present invention;
FIG. 7 is a schematic diagram of the demolding of the shaped form of the pile-supported cast-in-place concrete retaining wall of the present invention;
FIG. 8 is a schematic diagram illustrating the slippage of the cast-in-place concrete retaining wall construction forms of the present invention;
FIG. 9 is a schematic view of the prefabricated reinforced concrete water guard of the present invention;
FIG. 10 is a schematic side view of a prefabricated reinforced concrete breakwater according to the present invention;
FIG. 11 is a schematic view of the steel truss assembled water guard plate of the present invention;
FIG. 12 is a front view of the steel truss assembly of the present invention;
fig. 13 is a view of the dry-period cofferdam pile-supported retaining wall and the construction method and the construction flow chart thereof.
Wherein: 1-rock-socketed pile, 2-pile foundation bearing platform, 3-concrete retaining wall, 4-stone facing, 5-earth-rock cofferdam, 6-high-spraying impervious wall, 7-prefabricated water baffle, 8-original topographic line, 9-pile foundation island construction platform, 10-separated steel pile casing, 11-pile casing bottom shelf, 12-pile casing movable bottom plate, 13-fixed positioning rod, 14-bottom plate lifting rod, 15-string rod prefabricated block weight, 16-pile top reserved rib, 17-pile body top diameter expansion, 18-pile top stripped pile core, 19-pile top embedded high-strength connecting rib, 20-connecting rib annular bottom plate, 21-assembled prefabricated bearing platform, 22-bearing platform connecting hole, 23-bearing platform connecting partition plate, 24-connecting grouting body, 25-bearing platform connecting rib reserved rib, 26-bearing platform connecting side plate, 27-bearing platform reserved embedding groove, 29-retaining wall regularization reinforced side die, 30-retaining wall open-close type end die, 31-side die slide rail, 32-side die supporting vertical bent, 33-horizontal jacking jack, 34-horizontal jacking jack back plate, 35-horizontal demoulding jack, 36-horizontal demoulding jack back plate, 37-vertical jack, 38-vertical jack laying base, 39-template top adjustable opposite-pulling support frame, 40-template traction frame, 41-bearing platform preset fixing piece, 42-impervious wall top cement soil plate, 43-embedded fixed ground anchor, 44-reinforced concrete water retaining plate, 45-water retaining plate rib column, 46-water retaining plate bottom plate, 47-impermeable rubber strip, 48-oblique supporting rod, 49-external integral waterproof cloth, 50-bagged soil bottom fixing, 51-water baffle horizontal rabbet, 52-water baffle vertical rabbet, 53-water-swelling rubber strip, 54-steel truss, 55-truss assembling connecting rod, 56-truss fixing bottom plate, 57-truss symmetrical weight, 58-truss prestress vertical pull rod, 59-truss side plate, 60-coiled material waterproof layer and 61-external roll-up type integral waterproof cloth.
Detailed Description
The invention will be described in detail below with reference to examples shown in the accompanying drawings:
fig. 1 is a schematic view of a pile-supported retaining wall and a construction platform of a cofferdam in a dry period, and the structure mainly comprises: the pile foundation bearing platform 2, the concrete retaining wall 3, the block stone protective surface 4 and the earth-rock cofferdam 5 form a wall guide section pile-supported retaining wall island construction dry-period cofferdam, an original landform line 8 is improved to a safe height, and a high-spraying impervious wall 6 is built after the earth-rock cofferdam 5 is filled.
In fig. 2, a fixing and positioning rod 13 is embedded in the center of the separated steel casing 10 and used for fixing the separated steel casing 10 in the earth-rock foundation; the bottom of the separated steel casing 10 is provided with a casing movable bottom plate 12, and two bottom plate lifting rods 14 are welded on the bottom plate movable bottom plate for lifting and hanging; the bottom end is provided with a pile casing bottom shelf 11 as a support bottom for supporting a pile casing movable bottom plate 12, and a fixed positioning rod 13 penetrates through the pile casing movable bottom plate 12 to reach the earth and stone base.
Further, before the pile foundation is formed, string rod precast block weights 15 are placed in the separated steel casing 10 to stabilize the casing, and during pile foundation construction, the string rod precast block weights 15 can be lifted away through the bottom plate lifting rod 14 to carry out construction.
Fig. 3 shows an assembled prefabricated bearing platform 21 of the present invention, which comprises a bearing platform connecting reserved rib 25, a bearing platform connecting side plate 26, a bearing platform connecting partition plate 23 and a bearing platform connecting hole 22. The prefabricated pile cap 21 connecting system is characterized in that the prefabricated pile cap 21 is in lap joint with a pile body top expanding 17 and a pile top reserved rib 16, the pile cap connecting reserved rib 25 and the pile top embedded high-strength connecting rib 19 are anchored through a pile cap connecting partition plate 23, and a gap part between the pile cap connecting reserved rib 25 and the pile top embedded high-strength connecting rib 19 is poured into a whole through a connecting grouting body 24. The prefabricated bearing platform 21 is provided with a bearing platform preformed embedding groove 27 for embedding the prefabricated bearing platform 21 and the concrete retaining wall 3 to play a role in skid resistance. FIG. 4 is a schematic view of the connection of the prefabricated bearing platform 21 of the present invention, wherein the reserved ribs 25 are anchored by the bearing platform connecting partition 23; the adjacent prefabricated bearing platforms 21 are connected through a bearing platform connecting side plate 26 and are provided with bearing platform connecting holes 22.
Fig. 5 is a pile-supported cast-in-place concrete retaining wall regularization template, which is characterized in that retaining wall open-close type end molds 30 are arranged at two ends of a retaining wall regularization reinforcing side mold 29, a sectional type template can be disassembled and connected, and the retaining wall regularization reinforcing side mold 29 is assembled and disassembled with a horizontal jacking jack 33 and a horizontal demoulding jack 35.
Fig. 6, 9 and 10 are schematic diagrams of prefabricated reinforced concrete water baffles according to the invention, wherein the reinforced concrete water baffles 44 are bolted with the water baffle bottom plate 46 through the water baffle vertical tongue-and-groove 52, and the water baffle bottom plate 46 is connected with the cement soil plate 42 at the top of the impervious wall through the embedded fixed ground anchor 43. The water-backing side of the reinforced concrete water baffle 44 is reinforced by a water baffle rib column 45 and an oblique brace 48, the water baffle rib column 45 is fixedly connected with the reinforced concrete water baffle 44 and a water baffle bottom plate 46, and two ends of the oblique brace 48 are fixedly connected with the reinforced concrete water baffle 44 and a cement soil plate 42 at the top of the impervious wall respectively. The reinforced concrete water baffle 44 is provided with an external integral waterproof cloth 49 on the upstream side, a water-swelling rubber strip 53 is bonded at the vertical rabbet 52 of the water baffle, and an anti-seepage rubber strip 47 is bonded at the bottom plate 46 of the water baffle. The horizontal rabbet 51 of the breakwater at the joint of the reinforced concrete breakwater 44 is provided with a water-swelling rubber strip 53.
FIG. 7 is a schematic diagram of the present invention showing the demoulding of the shaped formwork of the pile-supported cast-in-place concrete retaining wall, wherein the formwork traction mechanism comprises a formwork traction frame 40, a formwork assembly and disassembly assembly, a vertical power assembly and a lateral formwork slide rail 31 are arranged on the pile foundation bearing platform 2 at both sides of the formwork main body, the formwork assembly and disassembly assembly comprises a horizontal jacking assembly and a horizontal demoulding assembly which are arranged at both ends of the formwork main body, the horizontal jacking assembly comprises a horizontal jacking jack 33 and a horizontal jacking jack back plate 34 which is connected with the horizontal jacking jack 33 and is arranged on the pile foundation bearing platform 2, the horizontal demoulding assembly comprises a horizontal demoulding jack 35 and a horizontal demoulding jack back plate 36, the vertical power assembly comprises a vertical jack base 38 arranged on the pile foundation bearing platform 2 and a vertical jack 37 which is arranged in the vertical jack base 38 and can jack the formwork main body, the formwork traction frame 40 covers the formwork main body, and is connected with the template main body through a steel wire rope. Horizontal demoulding jack backplate 36 provides the counter-force and draws the steel mould outwards, helps the drawing of patterns, can prevent to damage the concrete in the drawing of patterns in-process.
FIG. 8 is a schematic diagram of the slip of the cast-in-place concrete retaining wall construction formwork of the present invention, wherein when the next retaining wall construction is performed, the vertical jack 37 is used to jack up the retaining wall regularization reinforced side form 29 and move it to the side form slide rail 31, and the formwork traction frame 40 is used to pull it to the next segment for construction; the top of the retaining wall regularization strengthening side die 29 is provided with a template top adjustable opposite-pulling support frame 39, and the template space between the retaining wall regularization strengthening side dies 29 is adjustable. The distance between the opposite-pull support frames 39 can be adjusted at the top of the template, the retaining wall regularization strengthening side die 29 slides to the side die slide rail 31, and the template traction frame 40 pulls the retaining wall regularization strengthening side die 29 to follow through a traction steel wire rope, and the side die slide rail 31 slides to the next construction surface for retaining wall construction.
Fig. 11 is a schematic view of the steel truss assembled water deflector, wherein the bottom of the steel truss 54 is connected with a truss fixing bottom plate 56, and the truss fixing bottom plate 56 is anchored on the upper part of the cement soil plate 42 at the top of the impervious wall. The steel truss 54 is stabilized by placing truss symmetrical weights 57 on both sides and providing a truss prestressed vertical tie 58 in the center of the steel truss 54. The truss side plates 59 and the external roll-up type integral waterproof cloth 61 are arranged on the water facing side of the steel truss 54, the surfaces of the truss side plates 59 are coated with coiled material waterproof layers 60, and the coiled material waterproof layers and the external roll-up type integral waterproof cloth 61 form two waterproof and waterproof lines together.
Fig. 12 is an assembly front view of the steel truss of the present invention, two ends of the truss prestressed vertical pull rod 58 are respectively disposed at the bottom end of the cement soil and the top end of the steel truss 54 to form a vertical pull force, and the steel trusses 54 are spliced by the truss assembly connecting rod 55.
As shown in fig. 13, the construction method of the dry-period cofferdam pile-supported retaining wall includes the following steps:
(1) construction arrangement: in the design range, preparing hydropower, tools and materials required by construction and cofferdam filling soil and stones, and making construction safety and environmental protection measures;
(2) filling a cofferdam: and directly transporting the materials from the excavation area to the cofferdam backfilling part by the dumper, and carrying out layered construction. The cofferdam filling engineering quantity is mainly concentrated at the outer guide wall part, and the planned creating conditions are respectively occupied from the upstream end and the downstream end in opposite directions;
(3) building an island and compacting: the leveling material is constructed by a bulldozer and is compacted by vibration rolling, and the slope is trimmed by a back shovel assisted with manual work, so that the slope is smooth;
(4) and (3) high-pressure jet anti-seepage wall construction: constructing each rotary spraying hole of the high-pressure jet anti-seepage wall in sequence, dividing the construction into wall sections, and then connecting the wall sections into a whole wall; and (3) constructing all the rotary spraying holes of the high-pressure jet anti-seepage wall in sequence, dividing the construction into wall sections, and then connecting the wall sections into the whole wall. The method comprises the steps of dividing the hole into a first-order hole and a second-order hole according to the number of the rotary jet grouting hole, drilling the second-order hole after completing the hole forming and jet grouting of the first-order hole, and completing the rotary jet grouting. The construction mainly comprises the following concrete steps: drilling, inserting pipes, spraying, filling and grouting;
(5) prefabricating an assembled prefabricated bearing platform: prefabricating the assembly type prefabricated bearing platform according to design requirements;
(6) prefabricating a cast-in-place concrete retaining wall regularization template: prefabricating a cast-in-place concrete retaining wall stereotyped template according to design requirements;
(7) placing a separated steel casing: placing the separated steel casing 10 at the position of the pile foundation required by design;
(8) stabilizing the steel casing: placing a string rod precast block ballast weight 15 in the separated steel casing 10;
(9) and (3) construction of a cast-in-place pile: pulling out a bottom plate lifting rod 14 and a pile casing movable bottom plate 12 and a string rod precast block weight 15 connected with the bottom plate lifting rod, and pouring concrete;
(10) placing a prefabricated bearing platform: assembling the prefabricated bearing platform to the pile top;
(11) placing a cast-in-place concrete retaining wall stereotyped template: before the construction of the retaining wall, assembling templates and materials required by construction according to design requirements;
(12) and (3) construction of a cast-in-place concrete retaining wall: pouring by adopting concrete;
(13) prefabricating a water baffle: according to the hydrogeological condition and the water level condition of a construction site, selecting an assembled reinforced concrete water baffle or a steel truss assembled water baffle, and prefabricating;
(14) placing a water baffle: and placing the water baffle and assembling the water baffle to the required elevation and length according to the design requirement.
The retaining wall template is a prefabricated pile-supported cast-in-place concrete retaining wall stereotyped template; the foundation construction adopts prefabricated cushion cap of pile foundation assembled, its characterized in that: the pile foundation construction adopts a separated built-in pressure weight casing embedded system, and the bearing platform adopts an assembled prefabricated bearing platform and a connecting system; and finally, selecting the prefabricated reinforced concrete water baffle or the steel truss assembled water baffle according to the actual situation to improve the water retaining capacity of the cofferdam.
Withered period cofferdam pile holds formula barricade, its characterized in that: comprises a concrete retaining wall 3, a pile foundation bearing platform 2, a rock-socketed pile 1 and a separated steel casing 10 which is pre-embedded before pile forming. The separated steel pile casing 10 pre-embedded before pile forming is characterized in that a fixed positioning rod 13 is pre-embedded in the center, a pile casing movable bottom plate 12 and a bottom plate lifting rod 14 are arranged in the pile casing, a string rod precast block weight 15 is placed in the pile casing to maintain the stability of the separated steel pile casing 10, and pile foundation construction can be carried out by taking out the string rod precast block weight 15 through the bottom plate lifting rod 14 before pile forming.
More specifically, the pile-supported cast-in-place concrete retaining wall regularization template is characterized in that the template adopts a retaining wall regularization reinforced side mold 29, a jack system and a side mold sliding system. Pile type cast-in-place concrete barricade regularization template sets up barricade open and close formula end mould 30 at the tip, and both sides are supported vertical framed bent 32 by the side form and are supported, and the framed bent is connected fixedly with cushion cap preset fixing part 41, and side form slide rail 31 is placed to barricade regularization enhancement side form 29 both sides, is convenient for pull barricade regularization enhancement side form 29 to one section construction next.
The prefabricated pile cap of pile foundation assembled mainly includes prefabricated pile cap 21 of assembled and its connection system, and sets up rather than the pile top of being connected. The concrete expression is as follows: the prefabricated bearing platform 21 is placed at the top expanding part 17 of the pile body at the top of the pile, and the reserved connecting ribs 25 of the bearing platform are anchored through the bearing platform connecting partition plate 23 and connected with the high-strength connecting ribs 19 embedded in the pile top; connecting bearing platform connecting side plates 26 between the prefabricated assembly bearing platforms 21 to form bearing platform connecting holes 22, and filling the bearing platform connecting holes with connecting grouting materials 24 to form the connection between the prefabricated assembly bearing platforms 21 and the pile body.
Further, the prefabricated water baffle 7 comprises two options: the prefabricated reinforced concrete water baffle and the steel truss assembled water baffle can be used for selecting the prefabricated water baffle 7 according to the actual condition of a construction site.
The reinforced concrete water baffles 44 are bolted through horizontal rabbet 51 of the water baffles, and the water baffle bottom plate 46 is connected with the cement soil plate 42 at the top of the impervious wall through a pre-embedded fixed ground anchor 43. The water-backing side of the reinforced concrete water baffle 44 is reinforced by water baffle rib columns 45 and oblique support rods 48, an external integral waterproof cloth 49 facing the water surface is arranged, a water-swelling rubber strip 53 is bonded at the vertical rabbet 52 of the water baffle, and an anti-seepage rubber strip 47 is bonded at the bottom plate 46 of the water baffle.
The steel truss assembled water baffle is characterized in that the bottom of a steel truss 54 is connected with a truss fixing bottom plate 56, and the truss fixing bottom plate 56 is anchored on the upper portion of the cement soil plate 42 on the top of the impervious wall. The steel truss 54 is stabilized by placing truss symmetric weights 57 on both sides and placing a truss prestressed vertical tie 58 in the center of the steel truss 54. The truss side plates 59 and the external roll-up type integral waterproof cloth 61 are arranged on the water facing side of the steel truss 54, the surfaces of the truss side plates 59 are coated with coiled material waterproof layers 60, and the coiled material waterproof layers and the external roll-up type integral waterproof cloth 61 form two waterproof lines.
Claims (7)
1. Withered period cofferdam pile-supported barricade, its characterized in that: including barricade subassembly, lump stone mask (4), pile foundation island construction platform (9) and the manger plate subassembly of all setting on former topography line (8), the barricade subassembly includes that from the bottom up connects in order inlays rock pile (1), pile foundation cushion cap (2) and concrete retaining wall (3), it sets up in former topography line (8) to inlay rock pile (1), the manger plate subassembly is including setting up high-pressure jet cut-off wall (6), prefabricated breakwater (7) and earth and rockfill cofferdam (5), and high-pressure jet cut-off wall (6) set up on former topography line (8), and prefabricated breakwater (7) set up on high-pressure jet cut-off wall (6), form earth and rockfill cofferdam (5) through the cofferdam on former topography line (8), promote former topography line (8) to the construction requirement elevation, form island construction platform (9), and earth and rockfill cofferdam (5) are near high-pressure jet cut-off wall (6), the pile foundation island-building construction platform (9) is arranged on the water-facing side of the concrete retaining wall (3), the rock block protective surface (4) is arranged on the water-backing side of the concrete retaining wall (3), the pile foundation bearing platform (2) is a pile foundation prefabricated bearing platform and comprises a plurality of prefabricated bearing platforms (21) which are connected end to end, adjacent prefabricated bearing platforms (21) are connected through bearing platform connecting side plates (26) and are provided with bearing platform connecting holes (22), bearing platform connecting reserved ribs (25) are preset in the prefabricated bearing platforms (21), the top of the rock-embedded pile (1) is connected with a pile top stripping pile core (18), pile top embedded high-strength connecting ribs (19) which penetrate through the pile top stripping pile core (18) are preset in the rock-embedded pile (1), pile top embedded high-strength connecting ribs (19) are connected between the bearing platform reserved ribs (25) through bearing platform connecting partition plates (23), and pile foundation embedded high-strength connecting ribs (19) are connected, and the pile foundation bearing platform (2) is placed on the top expanding body (17), pile top is peeled and is stayed pile core (18) and is inserted in cushion cap connecting hole (22), and cushion cap connecting hole (22) are clogged and are irritated body (24), and prefabricated breakwater (7) include two kinds of selections: the reinforced concrete water baffle and the steel truss assembled water baffle select the prefabricated water baffle (7) according to the actual situation of the construction site.
2. The dead-time cofferdam pile-supported retaining wall of claim 1, wherein the reinforced concrete breakwater (44) is bolted through the breakwater horizontal rabbet (51), the reinforced concrete breakwater (44) is bolted with the breakwater bottom plate (46) through the breakwater vertical rabbet (52), the breakwater bottom plate (46) is connected with the cement soil slab (42) at the top of the impervious wall through the pre-embedded fixed ground anchor (43), the backwater side of the reinforced concrete breakwater (44) is reinforced by the breakwater rib columns (45) and the oblique bracing rods (48), the breakwater rib columns (45) are fixedly connected with the reinforced concrete breakwater (44) and the breakwater bottom plate (46), the two ends of the oblique bracing rods (48) are fixedly connected with the reinforced concrete breakwater (44) and the cement soil slab (42) at the top of the impervious wall respectively, the water-facing surface of the reinforced concrete breakwater (44) is provided with the external waterproof cloth (49), a water-swelling rubber strip (53) is bonded at the vertical rabbet (52) of the water baffle, an impermeable rubber strip (47) is bonded at the bottom plate (46) of the water baffle, and a water-swelling rubber strip (53) is arranged at the horizontal rabbet (51) of the water baffle at the joint of the reinforced concrete water baffle (44).
3. The dead-time cofferdam pile-supported retaining wall of claim 1, wherein the steel truss assembled water guard plate comprises a steel truss (54), a truss fixing bottom plate (56), a truss symmetrical weight (57), truss side plates (59) and an external roll-up integral waterproof cloth (61), the truss fixing bottom plate (56) is connected to the bottom of the steel truss (54), the truss fixing bottom plate (56) is anchored on the upper part of the cement soil plate (42) at the top of the impervious wall, the truss symmetrical weight (57) is placed on both sides of the steel truss (54), a truss prestress vertical pull rod (58) is arranged in the center of the steel truss (54), the truss side plates (59) and the external roll-up integral waterproof cloth (61) are both arranged on the water facing side of the steel truss (54), and a coiled waterproof layer (60) is coated on the surface of the truss side plates (59).
4. The construction method of a dry-period cofferdam pile-bearing type retaining wall as claimed in any one of claims 1 to 3, comprising the steps of:
1) construction arrangement: in the design range, preparing hydropower, tools and materials required by construction and cofferdam filling soil and stones, and making construction safety and environmental protection measures;
2) filling a cofferdam: on an original terrain line (8), directly transporting to a cofferdam backfill part from an excavation area by a dump truck, and constructing in layers, wherein the cofferdam filling engineering quantity is mainly concentrated on the water facing side of the concrete retaining wall (3), and the cofferdam filling engineering quantity is started from one of an upstream end and a downstream end or is started to face each other from the upstream end and the downstream end according to the field conditions;
3) building an island and compacting: the leveling material is constructed by a bulldozer and is compacted by vibration rolling, and the slope is trimmed by a back shovel assisted with manual work, so that the slope is smooth;
4) and (3) high-pressure jet anti-seepage wall construction: constructing each rotary spraying hole of the high-pressure jet anti-seepage wall in sequence, dividing the construction into wall sections, and then connecting the wall sections into a whole wall;
5) constructing a pile foundation bearing platform (2): prefabricating a plurality of prefabricated bearing platforms preset with bearing platform connection reserved ribs (25) according to design requirements, and then connecting to form a pile foundation bearing platform (2);
6) prefabricating a cast-in-place concrete retaining wall regularization template: prefabricating a cast-in-place concrete retaining wall stereotyped template according to design requirements;
7) constructing the rock-socketed pile (1): placing a separated steel casing (10) at the position of a pile foundation required by the design of an original topographic line (8), embedding a fixed positioning rod (13) at the center of the separated steel casing (10), arranging a casing movable bottom plate (12) and a bottom plate lifting rod (14) in the separated steel casing (10), and then placing a string rod precast block ballast (15) in the separated steel casing (10) to keep stable; pulling out a bottom plate lifting rod (14) and a pile casing movable bottom plate (12) and a string rod precast block weight (15) connected with the bottom plate lifting rod, and pouring concrete;
8) installing and constructing a pile foundation bearing platform (2): the pile foundation bearing platform (2) is assembled on the rock-socketed pile (1), the pile top stripped pile core (18) is inserted into the bearing platform connecting hole (22), and then the bearing platform connecting hole (22) is filled with grouting body (24) to realize connection and fixation;
9) and (3) construction of a cast-in-place concrete retaining wall: placing a cast-in-place concrete retaining wall stereotyped template on the pile foundation bearing platform (2), pouring concrete, then transferring the cast-in-place concrete retaining wall stereotyped template to the lower retaining wall position through a template traction mechanism, and pouring concrete again until the construction of the whole retaining wall is completed;
10) prefabricating a water baffle: according to the hydrogeological condition and the water level condition of a construction site, selecting an assembled reinforced concrete water baffle or a steel truss assembled water baffle, and prefabricating;
11) placing a water baffle: and placing the water baffle and assembling the water baffle to the required elevation and length according to the design requirement.
5. The construction method of the run-out cofferdam pile-bearing type retaining wall according to claim 4, wherein the cast-in-place concrete retaining wall regularization template comprises retaining wall regularization reinforced side mould (29), retaining wall open-close type end mould (30), adjustable opposite-pull support frame (39) at the top of the template, side mould supporting vertical bent frame (32) and a template traction mechanism, two retaining wall regularization reinforced side moulds (29) are adjustable opposite-pull support frame (39) to form a template main body, the retaining wall open-close type end mould (30) is arranged at two ends of the template main body, one side mould supporting vertical bent frame (32) is arranged at two sides of the template main body to support the retaining wall regularization reinforced side mould (29), a pile foundation preset fixing piece (41) is arranged on the pile foundation bearing platform (2), the side mould supporting vertical bent frame (32) is connected and fixed with the pile foundation preset fixing piece (41), the pile foundation bearing platform (2) is a pile foundation prefabricated pile foundation, the prefabricated pile cap comprises a plurality of prefabricated assembly type bearing caps (21) which are connected end to end, bearing cap connecting holes (22) are formed between the adjacent prefabricated assembly type bearing caps (21) through bearing cap connecting side plates (26), bearing cap connecting reserved ribs (25) are preset in the prefabricated assembly type bearing caps (21), a pile top stripping pile core (18) is connected to the top of a rock-embedded pile, and the pile top stripping pile core (18) is inserted into the bearing cap connecting holes (22).
6. The construction method of the dry-period cofferdam pile-bearing retaining wall as claimed in claim 5, wherein the formwork traction mechanism comprises a formwork traction frame (40), a formwork assembly and disassembly assembly, the vertical power assembly and the pile foundation bearing platform (2) at both sides of the formwork main body are both provided with a side formwork slide rail (31), the formwork assembly and disassembly assembly comprises a horizontal jacking assembly and a horizontal demoulding assembly which are both arranged at both ends of the formwork main body, the horizontal jacking assembly comprises a horizontal jacking jack (33) and a horizontal jacking jack back plate (34) which is connected with the horizontal jacking jack (33) and is arranged on the pile foundation bearing platform (2), the horizontal demoulding assembly comprises a horizontal demoulding jack (35) and a horizontal demoulding jack back plate (36), the vertical power assembly comprises a vertical jack resting base (38) which is arranged on the pile foundation bearing platform (2) and a vertical jack (37) which is arranged in the vertical jack resting base (38) and can jack the formwork main body, the template traction frame (40) covers the template main body and is connected with the template main body through a steel wire rope.
7. The construction method of the dry-period cofferdam pile-bearing retaining wall as claimed in claim 6, wherein in the step 5), a plurality of prefabricated bearing platforms (21) are connected end to end, adjacent prefabricated bearing platforms (21) are connected through bearing platform connecting side plates (26) and are formed with bearing platform connecting holes (22), the bearing platform connecting reserved ribs (25) are anchored through bearing platform connecting partition plates (23) and are connected with the pile top embedded high-strength connecting ribs (19), the pile top stripped pile core (18) is inserted into the bearing platform connecting holes (22), and the bearing platform connecting holes (22) are filled with grouting material (24).
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| CN105672197B (en) * | 2016-03-23 | 2017-11-10 | 上海勘测设计研究院有限公司 | The method and structure of heightening and consolidation embankment |
| CN106702840B (en) * | 2017-02-10 | 2022-05-24 | 湖南大学 | Anchor-pull type pile-bearing reinforced earth retaining wall embankment for treating soft soil roadbed on shoreside |
| CN209277090U (en) * | 2018-12-07 | 2019-08-20 | 四川港航建设工程有限公司 | Withered phase cofferdam pile formula barricade |
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