CN110004959B - Quick construction method and template for concrete cofferdam in flowing water environment - Google Patents
Quick construction method and template for concrete cofferdam in flowing water environment Download PDFInfo
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- CN110004959B CN110004959B CN201910344432.7A CN201910344432A CN110004959B CN 110004959 B CN110004959 B CN 110004959B CN 201910344432 A CN201910344432 A CN 201910344432A CN 110004959 B CN110004959 B CN 110004959B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B8/00—Details of barrages or weirs ; Energy dissipating devices carried by lock or dry-dock gates
- E02B8/06—Spillways; Devices for dissipation of energy, e.g. for reducing eddies also for lock or dry-dock gates
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B9/00—Water-power plants; Layout, construction or equipment, methods of, or apparatus for, making same
- E02B9/02—Water-ways
- E02B9/06—Pressure galleries or pressure conduits; Galleries specially adapted to house pressure conduits; Means specially adapted for use therewith, e.g. housings, valves, gates
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/06—Placing concrete under water
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
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Abstract
The invention provides a method and a template for quickly constructing a concrete cofferdam in a flowing water environment, wherein the template is processed, namely an underwater construction template is processed according to the shape of the cross section of an open channel at the outlet of a diversion tunnel; laying a Bailey bridge (1) as a receiving and auxiliary construction platform on one side of the top of open channel pouring construction; hoisting the template into the open channel in sections and fixing; the arrangement of a receiving hopper and a guide pipe; pouring underwater concrete; the rapid construction of the concrete cofferdam in the dynamic water environment is realized through the steps. The template comprises two panels which are oppositely arranged, a truss structure is arranged between the panels, gaps are arranged between the two ends of the panels and the open channel side slope, and flexible slurry blocking bodies are arranged between the two panels at the positions of the two ends of the panels; the template is also provided with a flat pressing pipe communicated with the upper and the lower streams. The invention overcomes the technical problem that corresponding construction equipment is difficult to hoist at the outlet of the diversion tunnel.
Description
Technical Field
The invention relates to the field of cofferdam construction of hydraulic and hydroelectric engineering, in particular to a method and a template for quickly constructing a concrete cofferdam in a flowing water environment.
Background
In the construction process of a hydropower station of a narrow canyon ultrahigh panel dam with a deep muddy covering layer, a full-year water retaining cofferdam needs to be arranged on an open channel at the outlet of a diversion tunnel so as to reconstruct the diversion tunnel into a very flood discharging tunnel.
According to the construction experience of similar previous engineering, when the diversion tunnel is reconstructed into a permanent hydraulic tunnel, the retaining cofferdam is generally constructed by filling an earth-rock cofferdam outside the reconstruction construction area range of the original diversion tunnel outlet, reinforcing the upstream face of the earth-rock cofferdam, and dismantling the earth-rock cofferdam after the reconstruction construction is finished. In this engineering, when the reconstruction is carried out, the power station is put into production for power generation, and the outlet of the very flood discharging hole after reconstruction is positioned at the downstream side opposite to the tail water outlet of the power station and is less than 50m, and is tightly attached to the downstream of the flip bucket of the outlet of the deep-hole flood discharging hole which is put into use, the construction of the earth-rock cofferdam has the following problems: (1) the occupied river channel area is large, the river channel blockage and river water harmony are easily caused, the tail water output is influenced, and the power generation efficiency is reduced; (2) during the reconstruction of the extraordinary flood discharge tunnel, long-term flood discharge is needed for the deep-hole flood discharge tunnel, the water is high and the water is urgent, so that the earth-rock cofferdam has great potential safety hazard and the reconstruction construction safety of the extraordinary flood discharge tunnel cannot be ensured; (3) the earth-rock cofferdam is built, the upstream face of the cofferdam is reinforced, and the cofferdam is finally dismantled, so that the construction period is long, and the construction cost is high. Therefore, the conventional earth-rock cofferdam is not beneficial to the construction of the project.
The conventional method is adopted for the construction of the concrete cofferdam, but the section size of the diversion tunnel outlet open channel is large (the width is 13 multiplied by 15 m), the concrete width of the top of the diversion open channel at the two sides of the outlet is only 1m, and the construction difficulty is large due to the inconvenient passage of the construction road, and the method specifically comprises the following steps: the bridge with enough bearing capacity is difficult to erect at the diversion tunnel outlet, large-tonnage hoisting equipment is difficult to arrange, water flow surge is large, construction is carried out under the condition of flowing water, the pressure bearing of the template is large, the water pressure of the upstream side and the downstream side of the template is different, the influence of the water surge and the water pressure unevenness is caused, and the template is easy to damage and deform.
Chinese patent document CN102409688A describes a construction method of a steel sheet pile cofferdam, which comprises the following steps: (1) construction preparation work; (2) and (3) measurement and paying-off: measuring and paying off to determine four angular points of the cofferdam according to the design size of the cofferdam and the central position of a bearing platform, and driving positioning piles at the angular points to serve as control points for positioning the steel sheet pile cofferdam; (3) constructing an inner support system consisting of a guide beam, wails, an inner support, a connecting beam and a joist; (4) the enclosing inner support is welded, assembled and integrally placed down, and then steel sheet pile inserting and driving construction is carried out; (5) cofferdam sludge suction; (6) closing the bottom of the cofferdam; (7) pumping water from the cofferdam and cleaning the foundation; (8) and (5) removing the cofferdam. But this scheme is difficult to be applicable to in the difficult operating mode of road hoist in this application.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method and a template for quickly constructing a concrete cofferdam in a flowing water environment, which can overcome the problems that an earth-rock cofferdam in the prior art occupies a large area of a river channel, and a steel sheet pile cofferdam is inconvenient to transport and difficult to hoist, and can overcome the pressure change of the template caused by different water pressures at the upstream side and the downstream side in a preferred scheme.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a quick construction method of a concrete cofferdam in a dynamic water environment comprises the following steps:
s1, template processing, namely processing an underwater steel truss template according to the cross section shape of the diversion tunnel outlet open channel;
s2, laying a Bailey bridge on one side of the top of the open channel pouring construction to serve as a receiving and auxiliary construction platform;
s3, hoisting the underwater steel truss template into the open channel in sections and fixing;
s4, arrangement of a receiving hopper and a guide pipe;
s5, pouring underwater concrete;
the rapid construction of the concrete cofferdam in the dynamic water environment is realized through the steps.
In the preferred scheme, the block stones of the open channel bottom plate are cleaned before construction;
arranging a truck crane on the Bailey bridge for cleaning the block stones, when the block stones are small, carrying the block stones into a hanging basket placed in water by a diver, and hoisting the block stones in the hanging basket to a dump truck stopped on a highway by the truck crane; when the block stone is large, a diver binds the steel wire rope on the block stone, and the block stone is moved out of the construction area by a truck crane.
In a preferred scheme, the structure of the underwater steel truss template comprises two panels which are oppositely arranged, a truss structure is arranged between the panels, and the back of each panel is provided with longitudinal wails and transverse wails which are fixedly connected with the panel;
gaps are arranged between the two ends of the panel and the open channel side slope, and flexible slurry retaining bodies are arranged between the two panels at the two ends of the panel; in the pouring process, the concrete struts the flexible slurry blocking body, so that the flexible slurry blocking body is tightly attached to the side slope of the open channel, and water blocking is realized;
the truss structure comprises a plurality of rods perpendicular to the panel, two ends of each rod are fixedly connected with the panel, the panel is longitudinally waited or transversely waited, a plurality of inclined rods are further arranged, and ends of the inclined rods are fixedly connected with ends of the rods perpendicular to the panel.
In the preferred scheme, clamping plates are arranged at two ends of a panel, and a bolt passes through the clamping plates, the panel and the flexible slurry blocking body to be fixedly connected with a nut; the flexible slurry blocking body is canvas or rubber cloth;
and a pressure equalizing pipe communicated with the upper stream and the lower stream is also arranged on the underwater steel truss template, a gate valve is arranged on the pressure equalizing pipe, and the pressure equalizing pipe is used as a water flow channel of the upper stream and the lower stream.
In a preferable scheme, flexible water blocking plates are further arranged at the two ends of the panel.
In the preferred scheme, the underwater steel truss template is divided into a plurality of sections from top to bottom, and the sections are hoisted in the hoisting process;
vertical guide pipes are arranged at the positions where the underwater steel truss templates of all the sections are contacted, and the guide pipes at different sections are mutually sleeved.
In the preferred scheme, a plurality of positioning steel wire ropes are arranged on the open channel side slope on the upstream side of the underwater steel truss template, and the positioning steel wire ropes are connected with the underwater steel truss template to realize the positioning of the underwater steel truss template.
An underwater steel truss template adopted by the rapid construction method of the concrete cofferdam in the dynamic water environment comprises two panels which are oppositely arranged, a truss structure is arranged between the panels, and longitudinal wails and transverse wails which are fixedly connected with the panels are arranged on the back surfaces of the panels;
gaps are arranged between the two ends of the panel and the open channel side slope, and flexible slurry retaining bodies are arranged between the two panels at the two ends of the panel;
the truss structure comprises a plurality of rods perpendicular to the panel, two ends of each rod are fixedly connected with the panel, the panel is longitudinally waited or transversely waited, a plurality of inclined rods are further arranged, and the ends of the inclined rods are fixedly connected with the ends of the rods perpendicular to the panel;
and a pressure equalizing pipe communicated with the upper stream and the lower stream is also arranged on the underwater steel truss template, a gate valve is arranged on the pressure equalizing pipe, and the pressure equalizing pipe is used as a water flow channel of the upper stream and the lower stream.
In the preferred scheme, flexible water blocking plates are further arranged at the two ends of the panel;
in the preferred scheme, the underwater steel truss template is divided into a plurality of sections from top to bottom, and the sections are hoisted in the hoisting process;
vertical guide pipes are arranged at the positions where the underwater steel truss templates of all the sections are contacted, and the guide pipes at different sections are mutually sleeved.
According to the method and the template for quickly constructing the concrete cofferdam in the dynamic water environment, the beret bridge is arranged above the diversion tunnel open channel, and the underwater steel truss template is hoisted in a segmented mode, so that the technical problems that corresponding construction equipment is difficult to hoist at the outlet of the diversion tunnel and the whole template is difficult to hoist are solved. In a preferred scheme, the influence of different water pressures on the upper stream side and the downstream side on the template is overcome by the arranged pressure equalizing pipe. The flexible slurry blocking body can ensure the plugging performance of the concrete cofferdam in the construction process. The water blocking plate can further improve the water blocking effect.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
fig. 1 is an elevation view of a diversion tunnel outlet open channel construction site of the present invention.
Fig. 2 is a plan view of a construction site of an open channel at an outlet of a diversion tunnel according to the present invention.
Fig. 3 is a top view of the template of the present invention.
Fig. 4 is a cross-sectional view of the template of the present invention.
Fig. 5 is a partially enlarged schematic view of a portion a of fig. 3.
FIG. 6 is an enlarged partial view of the ends of the die plate of the present invention.
In the figure: the novel steel structure comprises a Bailey bridge 1, a diversion tunnel 2, an upper-layer template 3, a panel 31, a truss structure 32, longitudinal wails 33, transverse wails 34, a flexible slurry blocking body 35, a water blocking plate 36, a clamping plate 37, a lower-layer template 4, an open channel side slope 5, an open channel bottom plate 6, a lifting device 7, an upper guide pipe 8, a lower guide pipe 9, a positioning steel wire rope 10, a flat pressing pipe 11 and a gate valve 12.
Detailed Description
Example 1:
as shown in fig. 1, the diversion tunnel 2 has a cross-sectional size of 13 × 15m, a width × a height, and a cave shape. The diversion tunnel export is trapezoidal open channel, and because the topography reason, the cofferdam construction degree of difficulty is great. The earth-rock cofferdam occupies a large area of a river channel, easily causes the blockage of the river channel and the high water level, and has the problems of large investment in construction cost, long construction period and the like. The concrete cofferdam has construction facilities, is difficult to hoist, such as inconvenient road traffic and difficult access of a large truck crane to a construction site, and the design flow of the place is 1960m3And/s, the difference of water pressure between the upstream and the downstream is large, and the construction difficulty is high.
In order to overcome the above difficulties, as shown in fig. 1 and 2, a method for quickly constructing a concrete cofferdam in a flowing water environment comprises the following steps:
s1, template processing, namely processing an underwater steel truss template according to the cross section shape of the diversion tunnel outlet open channel;
the preferable scheme is as shown in figures 3-6, and the structure of the underwater construction template is as follows:
the system comprises two panels 31 which are oppositely arranged, a truss structure 32 is arranged between the panels 31, and longitudinal wails 33 and transverse wails 34 which are fixedly connected with the panels 31 are arranged on the back surfaces of the panels 31;
as shown in fig. 3 and 4, the truss structure 32 includes a plurality of rods perpendicular to the panel, both ends of the rods are fixedly connected with the panel 31, the longitudinal wails 33 or the transverse wails 34, and a plurality of inclined rods, and ends of the inclined rods are fixedly connected with ends of the rods perpendicular to the panel. The bottom of the panel 31 is also provided with template peripheral angle steel.
Gaps are arranged between the two ends of the panel 31 and the open channel side slope 5, and flexible slurry blocking bodies 35 are arranged between the two panels 31 at the two ends of the panel 31;
in a preferred scheme, as shown in fig. 6, clamping plates 37 are arranged at two ends of the panel 31, and bolts pass through the clamping plates 37, the panel 31 and the flexible slurry blocking body 35 to be fixedly connected with nuts; the flexible slurry blocking body 35 is canvas or rubber cloth;
and a pressure equalizing pipe 11 communicating the upstream and the downstream is also arranged on the underwater steel truss template, a gate valve 12 is arranged on the pressure equalizing pipe 11, and the pressure equalizing pipe 11 is used as a water flow channel of the upstream and the downstream.
In a preferred embodiment, flexible water-blocking plates 36 are further provided at both ends of the panel 31. The water blocking plate 36 is a rubber plate and is used for compensating a gap between the underwater steel truss template and the open channel side slope 5.
In the preferred scheme, the underwater steel truss template is divided into a plurality of sections from top to bottom, and the sections are hoisted in the hoisting process; in the embodiment, the underwater steel truss formwork is divided into an upper formwork 3 and a lower formwork 4. Vertical guide pipes are arranged at the positions where the upper-layer formwork 3 and the lower-layer formwork 4 are in contact, and the guide pipes at different sections are mutually sleeved during construction.
S2, laying a Bailey bridge 1 on one side of the top of open channel pouring construction to serve as a receiving and auxiliary construction platform;
according to the water flow form at the outlet of the diversion tunnel, a certain amount of stones exist on the open channel bottom plate 6 at the outlet of the diversion tunnel. Before cofferdam construction, need arrange professional diver and visit and touch. 1, 25t of truck cranes are arranged on the Bailey bridge 1 for cleaning the block stones, when the block stones are small, a diver moves the block stones into a hanging basket placed in water, and the truck cranes hoist the block stones in the hanging basket to a dump truck stopped on a highway; when the block stone is large, a diver binds the steel wire rope on the block stone, and the block stone is moved out of the construction area by a truck crane.
S3, hoisting the underwater steel truss template into the open channel in sections and fixing;
the upper-layer formwork 3 and the lower-layer formwork 4 are processed on the assembly site, 1 25t truck crane is matched with a 10t flat car to be transferred to a lifting device 7 on the shore, namely, the 200t truck crane R =26m working range, the lower-layer formwork 4 is firstly lifted to a preset cofferdam construction position by the 200t truck crane, and the integral formwork is difficult to lift due to the fact that the construction position is not ideal, the road is narrow, the force arm of the 200t truck crane is long, and the stress of the 200t truck crane is poor at the preset cofferdam construction position.
After the hoisting is finished, the lower layer template 4 is fixed at a preset position through a positioning steel wire rope 10 by adopting a manual hoist. The method comprises the following specific steps: a plurality of 20t hand hoists are fixed on the upstream side of the open channel side slope 5 through anchor piles, preferably, the downstream side of the open channel side slope 5 and the Berea bridge 1 are further included, the hand hoists are connected with one end of a positioning steel wire rope 10, the other end of the positioning steel wire rope 10 is connected with the lower formwork 4, and the lower formwork 4 is adjusted to a preset position and fixed through tightening and loosening the hand hoists. And hoisting the upper-layer template 3 by using a 200t truck crane, and sleeving the upper guide pipe 8 of the upper-layer template 3 and the lower guide pipe 9 of the lower-layer template 4 in the hoisting process. So as to ensure the reliable connection of the upper layer template 3 and the lower layer template 4, and the upper layer template 3 is adjusted to a preset position and fixed through a positioning steel wire rope 10. The displacement of the underwater steel truss template caused by water current surge during underwater concrete pouring is prevented. The pressure equalizing pipe 11 is arranged on the upper-layer template 3, and a gate valve 12 on the pressure equalizing pipe 11 is opened in the hoisting process to balance the water pressure of the upstream side and the water pressure of the downstream side.
S4, arrangement of a receiving hopper and a guide pipe; the underwater concrete pouring is carried out by adopting a conduit method, the bottom of each conduit is positioned between the two panels 31 of the lower-layer template 4 and close to the open channel bottom plate 6, the diameter of each conduit is phi 250mm, a plurality of conduits are arranged along the length direction of the underwater steel truss template, preferably 6 conduits are arranged in the embodiment, and the receiving hopper is positioned below one side of the Bailey bridge 1, so that the dumper can pour quickly.
S5, pouring underwater concrete;
during pouring, the guide pipes are fed in turn, the concrete surface rises in parallel, no construction joint is left, and one-time continuous pouring is finished. When the concrete is poured underwater, the concrete entering the guide pipe in the first batch is not less than 1.5m3And continuously lifting the guide pipe in the pouring process to ensure that the depth of the guide pipe embedded in the concrete is not less than 60 cm. In the pouring process, the concrete struts the flexible slurry blocking body 35, so that the flexible slurry blocking body 35 is tightly attached to the open channel side slope 5, and water blocking is realized.
The rapid construction of the concrete cofferdam in the dynamic water environment is realized through the steps.
Example 2:
as shown in fig. 1 to 6, an underwater steel truss formwork for the rapid construction method of a concrete cofferdam in a flowing water environment comprises two panels 31 which are oppositely arranged, each panel is made of a 2.5mm steel plate, a truss structure 32 is arranged between the panels 31, and longitudinal wails 33 and transverse wails 34 which are fixedly connected with the panels 31 are arranged on the back surfaces of the panels 31; longitudinal wailing 33 is made of channel steel, and transverse wailing 34 is made of angle steel.
In the preferred scheme, the underwater steel truss template is divided into a plurality of sections from top to bottom, and the sections are hoisted in the hoisting process; as shown in fig. 1, the upper and lower forms 3 and 4 are divided.
Gaps are arranged between the two ends of the panel 31 and the open channel side slope 5, the width of the gap is 5-20cm, preferably 15cm, and flexible slurry blocking bodies 35 are arranged between the two panels 31 at the two ends of the panel 31;
in a preferred scheme, as shown in fig. 6, two clamping plates 37 are arranged at two ends of the panel 31, the clamping plates 37 are made of 8mm steel plates, and bolts penetrate through the clamping plates 37, the panel 31 and the flexible slurry blocking body 35 to be fixedly connected with nuts; the flexible slurry blocking body 35 is canvas or rubber cloth; the flexible slurry blocking body 35 is canvas or rubber cloth; in the pouring process, the concrete struts the flexible slurry blocking body 35, so that the flexible slurry blocking body 35 is tightly attached to the open channel side slope 5, and water blocking is realized.
The truss structure 32 comprises a plurality of rods perpendicular to the panel, two ends of each rod are fixedly connected with the panel 31, the longitudinal wails 33 or the transverse wails 34, a plurality of inclined rods are further arranged, and ends of the inclined rods are fixedly connected with ends of the rods perpendicular to the panel; in this example, angle steel is used for the horizontal bars and diagonal members of the truss structure 32. Channel steel is used instead of angle steel at the suspension point of the truss structure 32. The bottom of the panel 31 is also provided with template peripheral angle steel.
And a pressure equalizing pipe 11 communicating the upstream and the downstream is also arranged on the underwater steel truss template, a gate valve 12 is arranged on the pressure equalizing pipe 11, and the pressure equalizing pipe 11 is used as a water flow channel of the upstream and the downstream. The pressure equalizing pipe 11 in this example is a DN300 pressure equalizing pipe, the pressure equalizing pipe 11 in this example extends out of the upstream side and the downstream side of the underwater steel truss template by 0.5m respectively, 1 matched gate valve is arranged on the downstream side respectively, the gate valve 12 is opened in the construction process, and the gate valve is closed after the pouring of the underwater cofferdam is completed, so as to balance the impact force of the water flow pressure on the upstream side and the downstream side of the underwater steel truss template on the underwater steel truss template.
In a preferred scheme, flexible water blocking plates 36 are further arranged at two ends of the panel 31; the water blocking plate 36 is made of rubber, the length of the end extending out of the panel 31 is 10-25 cm, preferably 15-30 cm, and the water blocking plate 36 is tightly attached to the open channel side slope 5 through deformation under water pressure, so that the water blocking effect is further improved.
Vertical guide pipes are arranged at the contact positions of the underwater steel truss templates of all the sections, the number of the guide pipes is 3 along the length direction of the underwater steel truss templates, the guide pipes of the upper template 3 and the lower template 4 are arranged in the middle of the truss structure 32, the upper guide pipe 8 is a DN150 steel pipe, and the lower guide pipe 9 is a DN100 steel pipe. The upper guide pipe 8 and the lower guide pipe 9 positioned on the upper formwork 3 and the lower formwork 4 are mutually sleeved in the installation process.
The above-described embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and the technical features described in the present invention can be used in combination with each other without conflict, and the scope of the present invention should be defined by the technical means described in the claims, and equivalents thereof including the technical features described in the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of the invention.
Claims (3)
1. A method for quickly constructing a concrete cofferdam in a dynamic water environment is characterized by comprising the following steps:
s1, template processing, namely processing an underwater steel truss template according to the cross section shape of the diversion tunnel outlet open channel;
the structure of the underwater steel truss formwork comprises two panels (31) which are oppositely arranged, a truss structure (32) is arranged between the panels (31), and longitudinal wails (33) and transverse wails (34) which are fixedly connected with the panels (31) are arranged on the back of the panels (31);
the truss structure (32) comprises a plurality of rods perpendicular to the panel, two ends of each rod are fixedly connected with the panel (31), the longitudinal wails (33) or the transverse wails (34), and the truss structure is also provided with a plurality of inclined rods, and the ends of the inclined rods are fixedly connected with the ends of the rods perpendicular to the panel;
gaps are arranged between the two ends of the panel (31) and the open channel side slope (5), and flexible slurry blocking bodies (35) are arranged between the two panels (31) at the positions of the two ends of the panel (31);
in the pouring process, the concrete struts the flexible slurry blocking body (35) to enable the flexible slurry blocking body (35) to be tightly attached to the open channel side slope (5) so as to realize water blocking;
flexible water blocking plates (36) are arranged at the two ends of the panel (31);
clamping plates (37) are arranged at two ends of the panel (31), and bolts penetrate through the clamping plates (37), the panel (31) and the flexible slurry blocking body (35) to be fixedly connected with nuts; the flexible slurry blocking body (35) is canvas or rubber cloth; a pressure equalizing pipe (11) communicated with the upstream and the downstream is also arranged on the template, a gate valve (12) is arranged on the pressure equalizing pipe (11), and the pressure equalizing pipe (11) is used as a water flow channel of the upstream and the downstream;
s2, laying a Bailey bridge (1) on one side of the top of the open channel pouring construction to serve as a receiving and auxiliary construction platform;
s3, hoisting the underwater steel truss template into the open channel in sections and fixing;
the underwater steel truss template is divided into a plurality of sections from top to bottom, and the sections are hoisted in the hoisting process;
vertical guide pipes are arranged at the positions where the templates of all the sections are contacted, and the guide pipes at different sections are mutually sleeved;
a plurality of positioning steel wire ropes (10) are arranged on the open channel side slope (5) on the upstream side of the underwater steel truss template, and the positioning steel wire ropes (10) are connected with the underwater steel truss template to realize positioning of the underwater steel truss template;
s4, arrangement of a receiving hopper and a guide pipe;
s5, pouring underwater concrete;
the rapid construction of the concrete cofferdam in the dynamic water environment is realized through the steps.
2. The method for quickly constructing the concrete cofferdam in the dynamic water environment as claimed in claim 1, which is characterized in that: cleaning the block stones of the open channel bottom plate (6) before construction;
arranging a truck crane on the Bailey bridge (1) for cleaning the block stones, when the block stones are small, carrying the block stones into a hanging basket placed in water by a diver, and hoisting the block stones in the hanging basket to a dump truck stopped on a highway by the truck crane; when the block stone is large, a diver binds the steel wire rope on the block stone, and the block stone is moved out of the construction area by a truck crane.
3. An underwater steel truss template adopted by the rapid construction method of the concrete cofferdam in the dynamic water environment according to any one of claims 1 to 2, which is characterized in that: the underwater steel truss template comprises two panels (31) which are oppositely arranged, a truss structure (32) is arranged between the panels (31), and longitudinal wails (33) and transverse wails (34) which are fixedly connected with the panels (31) are arranged on the back surfaces of the panels (31);
gaps are arranged between the two ends of the panel (31) and the open channel side slope (5), and flexible slurry blocking bodies (35) are arranged between the two panels (31) at the positions of the two ends of the panel (31);
flexible water blocking plates (36) are arranged at the two ends of the panel (31);
the truss structure (32) comprises a plurality of rods perpendicular to the panel, two ends of each rod are fixedly connected with the panel (31), the longitudinal wails (33) or the transverse wails (34), and the truss structure is also provided with a plurality of inclined rods, and the ends of the inclined rods are fixedly connected with the ends of the rods perpendicular to the panel;
the template is divided into a plurality of sections from top to bottom, and the sections are hoisted in the hoisting process;
vertical guide pipes are arranged at the positions where the templates of all the sections are contacted, and the guide pipes at different sections are mutually sleeved;
the template is also provided with a pressure equalizing pipe (11) communicated with the upstream and the downstream, the pressure equalizing pipe (11) is provided with a gate valve (12), and the pressure equalizing pipe (11) is used as a water flow channel of the upstream and the downstream.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910344432.7A CN110004959B (en) | 2019-04-26 | 2019-04-26 | Quick construction method and template for concrete cofferdam in flowing water environment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910344432.7A CN110004959B (en) | 2019-04-26 | 2019-04-26 | Quick construction method and template for concrete cofferdam in flowing water environment |
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| Publication Number | Publication Date |
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| CN110004959A CN110004959A (en) | 2019-07-12 |
| CN110004959B true CN110004959B (en) | 2021-04-27 |
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| CN201910344432.7A Active CN110004959B (en) | 2019-04-26 | 2019-04-26 | Quick construction method and template for concrete cofferdam in flowing water environment |
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| CN110725320A (en) * | 2019-10-16 | 2020-01-24 | 北京翔鲲水务建设有限公司 | Sand prevention sill pouring method |
| CN114991091B (en) * | 2022-05-10 | 2024-03-22 | 中国葛洲坝集团第二工程有限公司 | Anti-impact and wear-resistant concrete pouring method for bottom plate of double-twist-surface overflow surface |
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| KR20070033097A (en) * | 2005-09-20 | 2007-03-26 | 민병이 | Outflow device connected to drain pipe of river bank |
| CN101824814B (en) * | 2010-05-19 | 2011-08-24 | 葛洲坝集团第一工程有限公司 | Method for plugging diversion tunnel without cutoff by using cast-in-place reinforced concrete gate and the gate |
| CN105586858B (en) * | 2016-03-10 | 2018-11-30 | 中国电建集团成都勘测设计研究院有限公司 | A kind of diversion tunnel plugging structure |
| CN106522406A (en) * | 2016-11-18 | 2017-03-22 | 哈尔滨鸿盛房屋节能体系研发中心 | Assembly type cast-in-place concrete exterior thermal insulation wall steel skeleton framework system and connecting piece |
| CN106939581B (en) * | 2017-05-11 | 2023-03-31 | 合肥学院 | Interception net for dike breach of dam and construction method thereof |
| CN208472743U (en) * | 2018-05-24 | 2019-02-05 | 上海勘测设计研究院有限公司 | Assembled cofferdam structure |
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