CN112030750A - Construction process for tie beam in water - Google Patents
Construction process for tie beam in water Download PDFInfo
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- CN112030750A CN112030750A CN202010689968.5A CN202010689968A CN112030750A CN 112030750 A CN112030750 A CN 112030750A CN 202010689968 A CN202010689968 A CN 202010689968A CN 112030750 A CN112030750 A CN 112030750A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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Abstract
The invention provides a construction process of a tie beam in water, and relates to the technical field of tie beam construction. The underwater tie beam construction process specifically comprises the following steps: s1, construction preparation: firstly, cutting off a steel trestle platform, then cutting off a steel casing, and then chiseling and cleaning a pile head after cutting off the casing; s2, erecting a hoop support operation platform: after preparation work such as chiseling a construction platform and pile heads is finished, arranging measuring personnel to discharge the axis of the tie beam, and installing a hoop by the constructor according to the axis of the tie beam and the elevation of the tie beam; s3, mounting a bottom die; s4, processing and installing the steel bars; s6, pouring concrete; and S7, maintaining and removing the mold. According to the underwater beam tying construction process, the hoop support operation platform is directly established on the bridge pier stud during construction, workers can conveniently construct on the hoop support operation platform through the platform, and do not need to work on a ship body all the time, so that the construction cost and the construction time are greatly reduced.
Description
Technical Field
The invention relates to the technical field of tie beam construction, in particular to a construction process of a tie beam in water.
Background
The TJ04 standard section starts from the tail of a Li xi Zhen Wushi bridge in Engde, and finally reaches the 3 rd span of a big bridge in the North river, the origin-destination mileage is K56+ 208.2-K62 +243.726, the total length is 6036m, wherein 3 seats/1035.5 m of a main bridge and 5 seats/642.4 m of a ramp bridge, and the standard section has 8 bridges, namely a west-mouth big bridge, a Li xi Bei intercommunicated main line bridge, a Ping gang ridge big bridge, a Li xi Bei intercommunicated No. A ramp No. 1 bridge, a Li xi Bei intercommunicated No. 2 bridge, a Li xi Bei intercommunicated No. 4 bridge, a Li xi C ramp bridge and a Li xi Bei intercommunicated D ramp.
West-mouth bridge aquatic tie beam 10, set up the landing stage and construct, the construction scale is great, and west-mouth bridge is the environmental protection district of controlling closely, there is fishery to breed in the periphery, construction concrete placement, the vibration is to around, the environment produces great influence, so need improve the aquatic tie beam and construct to the surface of water, reduce the construction degree of difficulty, present surface of water construction mostly goes on the hull, construction cost is higher like this, and inconvenient operation, waste construction time relatively, need design an aquatic tie beam construction technology for this reason.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides an underwater tie beam construction process, which solves the problem that the existing tie beam construction process cannot meet the project construction.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: an underwater tie beam construction process specifically comprises the following steps:
s1, construction preparation: firstly, cutting off a steel trestle platform, then cutting off a steel casing, and then chiseling and cleaning a pile head after cutting off the casing;
s2, erecting a hoop support operation platform: after preparation work such as construction platform and pile head chisel out is accomplished, arrange the measurement personnel and emit the tie beam axis, constructor installs the staple bolt according to tie beam axis and tie beam elevation, its main step is as follows:
s2-1, firstly wrapping the pre-installation part of the underwater pile foundation by using geotextile, then hooping the anchor ear with the same diameter as the pile foundation at the pre-installation part of the pile foundation, and fastening by using bolts;
s2-2, installing two I56a I-shaped steel bars on hoops on two sides of a pile foundation respectively by using a truck crane, and welding the ends of the two I-shaped steel bars by using reinforcing steel bars to form a whole;
s2-3, after the I-shaped steel is installed, installing I18I-shaped steel serving as a distribution beam on the top surface of the I-shaped steel, wherein the distance is 0.5m, and the channel steel is placed vertically;
s2-4, after the construction platform is installed, arranging a vertical ladder from the trestle platform to the construction platform;
s3, installation of a bottom die: the bottom die is a shaped combined steel die, is uniformly processed and transported to a construction site by a manufacturer, then is assembled, then the template is assembled in sections by using a steam crane, the upper camber of 5-8 mm is reserved in the midspan when the bottom die is installed, the bottom die is arranged according to a parabolic line so as to eliminate lower deflection caused by the load bearing effect of a load bearing I-beam, rubber strips or adhesive tapes with the thickness of about 3mm are padded between the template joints to prevent concrete pitted surface caused by slurry leakage of the joints, and a release agent is uniformly coated after the template is installed;
s4, processing and installing the steel bars: the tie beam steel bars are manufactured in a concentrated mode in a steel bar yard, then the tie beam steel bars are transported to pier columns, and then the steel bars are adjusted to construction points through a steam crane to be installed;
s5, mounting of a side die: the installation of the side mold uses back cover mortar as a support, and uses the ink line which is well bounced on a mortar cushion layer to accurately position and install the tie beam template, after the installation of the side mold is finished, reinforcing steel bars with the diameter of 22mm are used as counter-pull rods to oppositely pull square channel steel at the top opening and the bottom of the template, so that the template is prevented from deforming, bolts with the diameter of 18mm are connected between the templates, and the bolts are connected and fastened according to requirements;
s6, pouring concrete: the concrete is intensively mixed in a mixing station and is transported to a construction site through a concrete tank truck, the concrete is transported into a tie beam template by adopting a chute during pouring, the chute is processed by adopting a bamboo plywood, and the lower part of the chute is supported by a steel pipe; the tie beam is formed by one-step pouring, concrete is poured in layers, the thickness of each layer is controlled to be 30cm, the next layer can be poured after one layer is vibrated, the vibration is carried out by adopting an inserted vibrator, the moving distance of the inserted vibrator is not more than 1.5 times of the action radius of the vibrator, the distance between the inserted vibrator and a side mold is kept to be 5-10 cm, the vibration time is 20-30 s, the degree is that the concrete stops sinking, no bubbles appear, the surface of the concrete presents laitance, the top surface is polished after the pouring is finished, and the surface flatness is ensured to meet the requirement;
s7, maintaining and removing the mold
S7-1, curing, namely, after concrete pouring is finished, covering and watering curing are carried out as soon as possible after final setting, the surface of the concrete cannot be damaged or polluted when covering, and when a template is covered on the surface of the concrete, the template is kept wet frequently during curing;
s7-2, dismantling the side mould, namely dismantling the side mould after the concrete strength reaches 2.5Mpa, and symmetrically, uniformly and sequentially propelling the side mould from the middle to two ends by using a crane;
s7-3, detaching the bottom die: and (3) when the strength of the concrete reaches 75% of the design strength, removing the bottom die, respectively threading two steel wire ropes with the diameter of 20 on each anchor ear, after the steel wire ropes are fixed, hoisting the four steel wire ropes by using a crane, after the crane is stable and in a stressed state, loosening the anchor ears on two sides simultaneously, slowly and upwards lifting the tie beam bottom die by using the crane at a constant speed until the tie beam bottom die falls onto the trestle platform, and then detaching the tie beam bottom die.
Preferably, the hoop in the step S2-1 is formed by connecting two semicircular arc-shaped plates through bolts, the arc-shaped plates are 16mm in thickness and 600mm in height, the radius of the arc-shaped plates is the same as the outer diameter of the pile foundation, and the bolts are high-strength bolts with the diameter of 30 mm.
Preferably, a sand cylinder is arranged between the hoop and the I-steel in the step S2-2, the height of the sand cylinder is 15cm, and the sand cylinder is provided with steel plates with the thickness of 1cm at the upper part and the lower part.
Preferably, in the step S2-3, each I18I-steel has a total length of 4 meters, and the two sides of each I-steel are respectively picked out to form a tie beam side of about 1.25 m.
Preferably, in the step S3, the bottom die is a steel die plate, the surface die is 5mm thick, the transverse rib channel steel is 8mm thick, and the vertical rib channel steel is 12mm thick.
(III) advantageous effects
The invention provides a construction process of a tie beam in water. The method has the following beneficial effects:
according to the underwater beam-tying construction process, the hoop support operation platform is directly established on the bridge pier stud during construction, workers can conveniently construct on the hoop support operation platform only by transporting materials through the transport ship, the workers only need to operate on the ship body when establishing the operation platform in the previous period, and do not need to always work on the ship body by the constructors, so that the construction cost and the construction time are greatly reduced.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example (b):
the embodiment of the invention provides a construction process of a tie beam in water, which specifically comprises the following steps:
s1, construction preparation: firstly, cutting off a steel trestle platform, then cutting off a steel casing, wherein the steel casing is cut off, the elevation of the steel casing is controlled by a measuring team, the bottom of a hoop can be just clamped at the top of the cut-off steel casing, the steel casing is cut off by adopting ferry as a construction platform for construction, pile heads are chiseled and cleaned immediately after the casing is cut off, and when the pile heads are chiseled off, concrete on the top of the pile heads is chiseled off to be 15cm above the elevation of the bottom surface of a tie beam by adopting a circular cutting method. Crushing concrete by adopting an air compressor and an air pick, manually cleaning the pile top when the concrete is broken to 15cm above the elevation of the bottom surface of the tie beam, and washing the pile top by using clear water to ensure the combination quality of the pile foundation and the new and old concrete of the tie beam;
s2, erecting a hoop support operation platform: after preparation work such as construction platform and pile head chisel out is accomplished, arrange the measurement personnel and emit the tie beam axis, constructor installs the staple bolt according to tie beam axis and tie beam elevation, its main step is as follows:
s2-1, firstly wrapping the pre-installation part of the underwater pile foundation by using geotextile, then hooping an anchor ear with the same diameter as the pile foundation on the pre-installation part of the pile foundation, and fastening by using a bolt, wherein the measure can improve the friction force between the pile foundation and the anchor ear, the anchor ear is adjusted to a specified position by a crane during construction, constructors take an ferry to the specified pile foundation, fix the ferry, and install and fasten the anchor ear bolt by using the ferry as a construction platform;
s2-2, installing two I56a I-shaped steel bars on anchor ears on two sides of a pile foundation respectively by using a truck crane, welding the end parts of the two I-shaped steel bars into a whole by using steel bars, arranging a sand cylinder between the anchor ears and the I-shaped steel bars for facilitating adjustment and installation of a later template, wherein the height of the sand cylinder is 15cm, and the upper part and the lower part of the sand cylinder are provided with 1cm thick steel plates;
s2-3, after I-beams are installed, I18I-beams are installed on the top surfaces of the I-beams and are used as distribution beams, the distance is 0.5m, channel steel is placed vertically, the total length of each I18I-beam is 4m, the beam tying edges on two sides are respectively selected to be about 1.25m, 100 battens are laid on the walkway part, the distance is 300mm, a splint is laid on the walkway part and is used as a construction worker operating platform and a passageway, the outer side of the I18I-beam is vertically and transversely welded into a guardrail handrail by phi 60 steel pipes, the periphery of the guardrail is protected by a green net, one steel pipe is arranged every 2m and is 1.5m high, construction safety is guaranteed, the I18I-beams and the double-spliced I56a I-beam are connected in a spot welding mode, and the situation that the distribution beams are overturned due to;
s2-4, after the construction platform is installed, a vertical ladder stand is arranged from the trestle platform to the construction platform, so that the construction personnel can get on and off conveniently;
s3, installation of a bottom die: the bottom die is a shaped combined steel die and is uniformly processed and transported to a construction site by a manufacturer, then the bottom die is assembled, the bottom die is a steel template, the thickness of a face die is 5mm, the thickness of transverse rib channel steel is 8mm, the thickness of vertical rib channel steel is 12mm, then the templates are assembled in sections by using a steam crane, the upper camber of 5-8 mm is reserved in a span during installation of the bottom die, the bottom die is arranged according to a parabola so as to eliminate lower bending caused by the load bearing effect of a bearing I-beam, rubber strips or adhesive tapes with the thickness of about 3mm are padded between template joints, concrete pitted surfaces caused by slurry leakage of the joints are prevented, and a release agent is uniformly coated after the templates are installed;
s4, processing and installing the steel bars: the tie beam steel bars are manufactured in a concentrated mode in a steel bar yard, then the tie beam steel bars are transported to pier columns, and then the steel bars are adjusted to construction points through a steam crane to be installed;
s5, mounting of a side die: the installation of the side mold uses back cover mortar as a support, and uses the ink line which is well bounced on a mortar cushion layer to accurately position and install the tie beam template, after the installation of the side mold is finished, reinforcing steel bars with the diameter of 22mm are used as counter-pull rods to oppositely pull square channel steel at the top opening and the bottom of the template, so that the template is prevented from deforming, bolts with the diameter of 18mm are connected between the templates, and the bolts are connected and fastened according to requirements;
s6, pouring concrete: the concrete is intensively mixed in a mixing station and is transported to a construction site through a concrete tank truck, the concrete is transported into a tie beam template by adopting a chute during pouring, the chute is processed by adopting a bamboo plywood, and the lower part of the chute is supported by a steel pipe; the tie beam is formed by one-step pouring, concrete is poured in layers, the thickness of each layer is controlled to be 30cm, the next layer can be poured after one layer is vibrated, the vibration is carried out by adopting an inserted vibrator, the moving distance of the inserted vibrator is not more than 1.5 times of the action radius of the vibrator, the distance between the inserted vibrator and a side mold is kept to be 5-10 cm, the vibration time is 20-30 s, the degree is that the concrete stops sinking, no bubbles appear, the surface of the concrete presents laitance, the top surface is polished after the pouring is finished, and the surface flatness is ensured to meet the requirement;
s7, maintaining and removing the mold
S7-1, curing, namely, after concrete pouring, covering and watering curing as soon as possible after final setting, wherein the surface of the concrete is not damaged or polluted when the covering is carried out, the template is required to be kept wet frequently during curing when the concrete surface is covered by the template, the covering and heat preservation are carried out when the temperature is lower than 5 ℃, the water for curing the concrete is required to be covered and not sprayed to the concrete surface, the condition of the water for curing the concrete is the same as that of mixing water, the watering curing time of the concrete is generally 7 days, and the concrete can be prolonged or shortened as required according to the humidity and the temperature of air, the variety of the cement, the mixed additive and the like. Spraying water every day for a time of keeping the surface of the concrete in a wet state frequently, removing the side template after the strength of the concrete reaches 2.5MPa, and then modifying the surface, covering with steam for curing when the temperature is too low, wherein the concrete cannot bear external load until the strength of the concrete reaches 2.5 MPa;
s7-2, dismantling the side mould, namely dismantling the side mould after the concrete strength reaches 2.5Mpa, pushing the side mould symmetrically, uniformly and sequentially from the middle to two ends by a crane, immediately wrapping the whole tie beam by a plastic film after the template is dismantled, and sealing the joint between the plastic films by an adhesive tape to ensure that the plastic film is airtight;
s7-3, detaching the bottom die: and (3) when the concrete strength reaches 75% of the design strength, the bottom die is removed, two steel wire ropes with the diameter of 20 are respectively threaded on each anchor ear, after the steel wire ropes are fixed, the four steel wire ropes are hung by a crane, after the crane is stable and in a stressed state, the anchor ears are simultaneously loosened on two sides, the crane keeps a constant speed to slowly lift the bottom die of the tie beam upwards until the bottom die of the tie beam falls onto the trestle platform, then the bottom die of the tie beam is detached, the removed formwork must be timely cleaned and repaired, a release agent is coated, and the next tie beam is transferred to construction.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. An underwater tie beam construction process is characterized in that: the method specifically comprises the following steps:
s1, construction preparation: firstly, cutting off a steel trestle platform, then cutting off a steel casing, and then chiseling and cleaning a pile head after cutting off the casing;
s2, erecting a hoop support operation platform: after preparation work such as construction platform and pile head chisel out is accomplished, arrange the measurement personnel and emit the tie beam axis, constructor installs the staple bolt according to tie beam axis and tie beam elevation, its main step is as follows:
s2-1, firstly wrapping the pre-installation part of the underwater pile foundation by using geotextile, then hooping the anchor ear with the same diameter as the pile foundation at the pre-installation part of the pile foundation, and fastening by using bolts;
s2-2, installing two I56a I-shaped steel bars on hoops on two sides of a pile foundation respectively by using a truck crane, and welding the ends of the two I-shaped steel bars by using reinforcing steel bars to form a whole;
s2-3, after the I-shaped steel is installed, installing I18I-shaped steel serving as a distribution beam on the top surface of the I-shaped steel, wherein the distance is 0.5m, and the channel steel is placed vertically;
s2-4, after the construction platform is installed, arranging a vertical ladder from the trestle platform to the construction platform;
s3, installation of a bottom die: the bottom die is a shaped combined steel die, is uniformly processed and transported to a construction site by a manufacturer, then is assembled, then the template is assembled in sections by using a steam crane, the upper camber of 5-8 mm is reserved in the midspan when the bottom die is installed, the bottom die is arranged according to a parabolic line so as to eliminate lower deflection caused by the load bearing effect of a load bearing I-beam, rubber strips or adhesive tapes with the thickness of about 3mm are padded between the template joints to prevent concrete pitted surface caused by slurry leakage of the joints, and a release agent is uniformly coated after the template is installed;
s4, processing and installing the steel bars: the tie beam steel bars are manufactured in a concentrated mode in a steel bar yard, then the tie beam steel bars are transported to pier columns, and then the steel bars are adjusted to construction points through a steam crane to be installed;
s5, mounting of a side die: the installation of the side mold uses back cover mortar as a support, and uses the ink line which is well bounced on a mortar cushion layer to accurately position and install the tie beam template, after the installation of the side mold is finished, reinforcing steel bars with the diameter of 22mm are used as counter-pull rods to oppositely pull square channel steel at the top opening and the bottom of the template, so that the template is prevented from deforming, bolts with the diameter of 18mm are connected between the templates, and the bolts are connected and fastened according to requirements;
s6, pouring concrete: the concrete is intensively mixed in a mixing station and is transported to a construction site through a concrete tank truck, the concrete is transported into a tie beam template by adopting a chute during pouring, the chute is processed by adopting a bamboo plywood, and the lower part of the chute is supported by a steel pipe; the tie beam is formed by one-step pouring, concrete is poured in layers, the thickness of each layer is controlled to be 30cm, the next layer can be poured after one layer is vibrated, the vibration is carried out by adopting an inserted vibrator, the moving distance of the inserted vibrator is not more than 1.5 times of the action radius of the vibrator, the distance between the inserted vibrator and a side mold is kept to be 5-10 cm, the vibration time is 20-30 s, the degree is that the concrete stops sinking, no bubbles appear, the surface of the concrete presents laitance, the top surface is polished after the pouring is finished, and the surface flatness is ensured to meet the requirement;
s7, maintaining and removing the mold
S7-1, curing, namely, after concrete pouring is finished, covering and watering curing are carried out as soon as possible after final setting, the surface of the concrete cannot be damaged or polluted when covering, and when a template is covered on the surface of the concrete, the template is kept wet frequently during curing;
s7-2, dismantling the side mould, namely dismantling the side mould after the concrete strength reaches 2.5Mpa, and symmetrically, uniformly and sequentially propelling the side mould from the middle to two ends by using a crane;
s7-3, detaching the bottom die: and (3) when the strength of the concrete reaches 75% of the design strength, removing the bottom die, respectively threading two steel wire ropes with the diameter of 20 on each anchor ear, after the steel wire ropes are fixed, hoisting the four steel wire ropes by using a crane, after the crane is stable and in a stressed state, loosening the anchor ears on two sides simultaneously, slowly and upwards lifting the tie beam bottom die by using the crane at a constant speed until the tie beam bottom die falls onto the trestle platform, and then detaching the tie beam bottom die.
2. The underwater tie beam construction process of claim 1, wherein: the hoop in the step S2-1 is formed by connecting two semicircular arc-shaped plates through bolts, the thickness of each arc-shaped plate is 16mm, the height of each arc-shaped plate is 600mm, the radius of each arc-shaped plate is the same as the outer diameter of the pile foundation, and each bolt is a high-strength bolt with the diameter of 30 mm.
3. The underwater tie beam construction process of claim 1, wherein: and in the step S2-2, a sand cylinder is arranged between the hoop and the I-steel, the height of the sand cylinder is 15cm, and the sand cylinder is vertically provided with 1cm thick steel plates.
4. The underwater tie beam construction process of claim 1, wherein: in the step S2-3, the total length of each I-steel I18 is 4 meters, and the tie beam edges are picked out from two sides to be about 1.25 meters.
5. The underwater tie beam construction process of claim 1, wherein: and in the step S3, the bottom die is a steel template, the thickness of the face die is 5mm, the thickness of the transverse rib channel steel is 8mm, and the thickness of the vertical rib channel steel is 12 mm.
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| CN202010689968.5A CN112030750A (en) | 2020-07-17 | 2020-07-17 | Construction process for tie beam in water |
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| CN202010689968.5A CN112030750A (en) | 2020-07-17 | 2020-07-17 | Construction process for tie beam in water |
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Cited By (1)
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