CN110374004A - A kind of presstressed reinforcing steel mud-jacking technology - Google Patents
A kind of presstressed reinforcing steel mud-jacking technology Download PDFInfo
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- CN110374004A CN110374004A CN201910621990.3A CN201910621990A CN110374004A CN 110374004 A CN110374004 A CN 110374004A CN 201910621990 A CN201910621990 A CN 201910621990A CN 110374004 A CN110374004 A CN 110374004A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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Abstract
The invention discloses a kind of presstressed reinforcing steel mud-jacking technologies, belong to bridge prestress mud-jacking technology field, its key points of the technical solution are that the following steps are included: S1, presstressed reinforcing steel design S2, presstressed reinforcing steel installation: S3, tension of prestressed tendon；S4, mud jacking: squeezing unit is installed in one end of prestressed pore passage respectively, squeezing unit includes madjack pipe and mudjack, and mudjack is connect with madjack pipe, and madjack pipe is connected to prestressed pore passage；The other end of prestressed pore passage is equipped with suction device, suction device includes grout outlet and vacuum pump, grout outlet is connected with vacuum pump, grout outlet is connected to prestressed pore passage, gas vent pipeline is all closed later, the air in vacuum pump extraction prestressed pore passage is first turned on, opens mudjack, the continuous pressure injection of cement slurry enters in prestressed pore passage；The advantages of S5, sealing off and covering anchorage, this presstressed reinforcing steel mud-jacking technology, is that cement can sufficiently be full of prestressed pore passage, improves the quality of presstressed reinforcing steel.
Description
Technical field
The present invention relates to bridge prestress mud-jacking technology, in particular to a kind of presstressed reinforcing steel mud-jacking technology.
Background technique
Presstressed reinforcing steel is made of single, more reinforcing bars, steel wire or steel strand wires.The surface of post-tensioning unbonded prestressing tendon is coated with
Pitch, grease or special lubricating and antirust material are allowed to mixed with surrounding with paper tape or plastic tape looping, or set with flexible plastic tube
Solidifying soil isolation is rest directly upon concreting in template as regular reinforcement, carries out after waiting concrete to reach prescribed strength
Tensioning.Unbonded tendon is usually used in the component that presstressed reinforcing steel is distributed or structure such as large-span bidirectional plate, two-way ribbed slab floor
Deng.Post-tensioning prestress with bond muscle, which refers to, to be first placed in reserving hole channel, passes through grouting recovery and surrounding after anchoring to be tensioned
The presstressed reinforcing steel of concrete binding.There is bonding muscle to be usually used in presstressed reinforcing steel configuration and compare concentration, the stretching force tonnage of every beam is larger
Component or structure.
Above structure is increasingly extensive in the use of existing building construction field, by taking the work progress of Taizhou Wan bridge as an example,
Taizhou Wan bridge and wiring engineering arise from six Ao Zhen of Sanmen County, connect with Sanmen Wan bridge and wiring engineering, finally Wenling city city
Nan Zhen connects Leqing Bay bridge and wiring engineering, and route overall length 102.381km mainly has three through counties and cities along the line, borders on the sea, green pepper
River, road and bridge and Wenling, this section are TS13 bid section engineering, beginning and end pile No. K174+410-K181+900, route overall length
7.49km, it is domestic that route is located at Wenling, Zhejiang province city.
Notification number is that the Chinese patent of CN104695334A discloses a kind of bridge vertical prestressing beam pipeline U-shaped connection filling
Starch construction method, 1, vertical prestressing beam it is pre-buried when select adjacent two vertical prestressing bars, using a single u-shaped plastics belt tube
Connection, U-shaped two end of plastics belt tube are inserted into respectively in the pipeline of adjacent two vertical prestressing bars, insertion depth >=20CM；2,
Concreting is completed, and after intensity reaches design requirement tensioning intensity, vertical prestressing Shu Zhangla is carried out, after the completion of tensioning in 48h
Mud jacking is carried out, selects an anchor plate hole as mud jacking slurry-feeding hole in box beam top surface, adjacent vertical prestressing anchor plate hole is done
For slurry outlet, operation is carried out according to mud-jacking technology and is completed at the same time two vertical prestressing bar mud jacking.
This construction method is when grouting, slurry-feeding hole when anchor plate hole is as mud jacking, and cement is directly by into slurry
Hole is injected into prestressed pore passage, but the prestressed pore passage in bridge be all often it is curved, in the apex angle of prestressed pore passage
Place, which is easy to appear, there is the not full situation of mud jacking in prestressed pore passage, cause presstressed reinforcing steel Forming Quality poor.
Summary of the invention
The object of the present invention is to provide a kind of presstressed reinforcing steel mud-jacking technology, it the advantage is that cement can sufficiently be full of prestressing force
The quality of presstressed reinforcing steel is improved in duct.
Above-mentioned technical purpose of the invention has the technical scheme that
A kind of presstressed reinforcing steel mud-jacking technology, comprising the following steps:
S1, presstressed reinforcing steel design: the presstressed reinforcing steel longitudinally used for box beam using high strength low relaxed steel strand wires winding bunchy and
At；It is used for the presstressed reinforcing steel that box beam laterally uses and rolls spiral；
S2, presstressed reinforcing steel installation: being provided with prestressed pore passage using pre-buried method in box beam, if being arranged on prestressed pore passage
Dry gas vent pipeline, gas vent pipeline stretch out box beam top surface, presstressed reinforcing steel are penetrated wherein from one end of prestressed pore passage, from pre-
The other end in stress duct is pierced by, and the both ends of presstressed reinforcing steel are provided with anchorage；
S3, tension of prestressed tendon: installing jack at the both ends of presstressed reinforcing steel respectively, pulls presstressed reinforcing steel by jack, first
First carry out initial stress tensioning；It is oil-filled to jack master cylinder, while anchorage and jack position are adjusted, make prestressed pore passage, anchorage
With the axis matches mutually of jack three, make elongation label when presstressed reinforcing steel reaches 10% δ con of initial stress；It carries out later
Tensioning: being carried out using the method pressurizeed step by step, after every stretching a period of time, is continued fuel feeding and is maintained stretching force constant, measurement is real
Whether border elongation is consistent with calculated value, if elongation is consistent with calculated value, increases pulling force and continues to stretch；Last prestressing force
Muscle anchoring: anchorage and presstressed reinforcing steel being fixed, later the oil extraction of piston jack master cylinder, the backward stroke of the piston of master cylinder, finally cut off more
Remaining steel strand wires；
S4, mud jacking: being equipped with squeezing unit in one end of prestressed pore passage respectively, and squeezing unit includes madjack pipe and mudjack,
Mudjack is connect with madjack pipe, and madjack pipe is connected to prestressed pore passage；The other end of prestressed pore passage is equipped with suction device, inhales
Sizing device includes grout outlet and vacuum pump, and grout outlet is connected with vacuum pump, and grout outlet is connected to prestressed pore passage, first before mud jacking
Cement is first configured, later all closes gas vent pipeline, when mud jacking, vacuum pump is first turned on and extracts sky in prestressed pore passage
Gas opens mudjack, and the continuous pressure injection of cement slurry enters in prestressed pore passage, after waiting for a period of time, by vacuum pump and grout outlet
The valve at place is successively closed, while continuing mud jacking, after reaching certain pressure to cement in prestressed pore passage, closes mud jacking pipe valve
Door stops slip casting；
S5, sealing off and covering anchorage: after presstressed reinforcing steel whole tensioning mud jacking is completed, anchorage is rinsed well, and will be at prestressed pore passage notch
After the reinforcing bar processing of truncation is clean, anchor Side Template is installed, and stay concrete pouring mouth template is suitable for reading on anchorage, pours sealing off and covering anchorage
Concrete.
By using above-mentioned technical proposal, since the transverse load and longitudinal loading of box beam have differences, according to stress feelings
The difference of condition, longitudinal presstressed reinforcing steel use steel strands wound bunchy, and lateral presstressed reinforcing steel is made using finish rolling deformed bar,
According to different stress conditions, presstressed reinforcing steel the most suitable is selected；It selects after suitable presstressed reinforcing steel, construction personnel will answer in advance
Power muscle penetrates into the corresponding hole of box beam, and opposite presstressed reinforcing steel carries out tension later, applies pulling force to presstressed reinforcing steel in advance, mentions
The bending resistance and rigidity of high box beam postpone the time that crack occurs, increase the durability of box beam, complete the tensioning of presstressed reinforcing steel
Later, it is filled with cement in prestressed pore passage, air in prestressed pore passage is extracted out, prestressed pore passage is in negative pressure shape at this time
State is conducive to cement and is circulated into prestressed pore passage, and regardless of which type of shape is prestressed pore passage design be in, prestressed pore passage is all
It can be sufficiently full of prestressed pore passage, after theing cement solidifies, make to improve the whole of box beam in prestress hole stronger ground box beam
Body rigidity and bearing capacity.
Further, in S1, steel strand wires per share nominal area 139mm2, normal intensity 1860Mpa, elasticity modulus 1.95
× 105Mpa designs control stress for prestressing 1395Mpa；Finish rolling deformed bar normal intensity fpk=785Mpa, stretching control force
0.9fpk=706.5Mpa, single control stretching force 568.2KN.
By using above-mentioned technical proposal, since presstressed reinforcing steel will receive the process of tension during construction, and
Box beam molding after come into operation after, presstressed reinforcing steel all can under tension, so in constitute presstressed reinforcing steel steel strand wires and
Finish rolling deformed bar must all have good structural strength, and a possibility that presstressed reinforcing steel broken string occurs in reduction.
Further, the prestressed pore passage uses bellows, and the shape of prestressed pore passage has linear, curved shape and folding
Linear, gas vent pipeline is managed using φ 20mmPVC, and the junction of prestressed pore passage and gas vent pipeline is blocked with sealant, in advance
Stress duct is sealed with anchorage junction using foamed glue.
By using above-mentioned technical proposal, since bellows has outstanding plastic deformation ability, prefabricated case beam when
It waits, bellows can be bent according to demand in various shape；Using sealant and foamed glue by prestressed pore passage and other component
Junction sealing, during avoiding mud jacking, occur leakage cement the case where.
Further, in S3, presstressed reinforcing steel is steel strand tension program: initial stress (0.1 ~ 0.2 σ con) → control is answered
Power (σ con=0.75fpk) → holding load 5 minutes → anchoring, the value of initial stress are answered in advance according to the length adjustment of presstressed reinforcing steel
Power muscle length takes 10% ~ 15% in 30m or less, and presstressed reinforcing steel length takes 15% ~ 20% in 30m ~ 60m, and presstressed reinforcing steel length is big
The capping 25% when 60m, steel strand wires Stress Control stress are δ con=0.75fpk=1395Mpa, sub-thread steel strand wires area of section A
=139mm2。
By using above-mentioned technical proposal, initial stress is determined according to the self structure intensity of steel strand wires first, later gradually
Increase stress and presstressed reinforcing steel stretched to setting stress, when stress reaches preset value, cannot be anchored at once at this time,
It needs to keep load 5 minutes, at this time the case where construction personnel's observation presstressed reinforcing steel, guarantees that presstressed reinforcing steel bears certain load simultaneously
And the case where being not in broken string.
Further, in S3, presstressed reinforcing steel is finish rolling deformed bar stressing sequence: initial stress (0.1 σ con) → control
Stress (σ con=0.9fpk) → holding 5 minutes → proof stress of load (σ con=0.9fpk) → anchoring, finish rolling deformed bar
Drawing proof stress is δ con=0.9fpk=706.5Mpa, and single control stretching force is 568.2KN.
By using above-mentioned technical proposal, when stretching presstressed reinforcing steel made of finish rolling deformed bar, it is also desirable to first
First determine a primary stress, gradually average rate increases to setting value to stress later, is kept for load 5 minutes, observes presstressed reinforcing steel
Situation just can be carried out anchoring when the case where fracture does not occur in presstressed reinforcing steel.
Further, in S4, during preparing cement, the water-cement ratio of cement slurry is preferably 0.26 ~ 0.28, cement used
Age is no more than 1 month, and swelling agent appropriate is mixed in cement, and when mixing cement, the blender revolving speed used should not be low
In 1000r/min.
By using above-mentioned technical proposal, the water-cement ratio of cement slurry is preferably 0.26 ~ 0.28, and the sludge age phase selected does not surpass
1 month is spent, guarantees that there is excellent adhering using cement, is conducive to the fixed prestressed pore passage of the stronger filling of cement；In cement
Swelling agent appropriate is mixed, in order to increase the expansion character of cement, when theing cement solidifies, the volume of cement becomes larger, and guarantees
Fill full prestress pipe；Blender revolving speed should be not less than 1000r/min, and cement is sufficiently stirred, improves the homogeneity of cement.
Further, in S4, the end of grout outlet is connected with two transparent pipes, is mounted on valve on two transparent pipes
Door, wherein a transparent pipe is connected with waste pulp bucket, another transparent pipe is connected with pressure bottle, and pressure bottle passes through pipeline and vacuum pump
Connection, and pressure gauge is installed on pipeline.
By using above-mentioned technical proposal, when mud jacking, grout outlet connects waste pulp bucket and waste pulp bucket using transparent pipe,
The case where staff can observe cement by transparent pipe；The suction pressure of vacuum pump is understood by pressure gauge.
Further, in S4, the air that vacuum pump extracts in prestressed pore passage is opened when vacuum degree reaches -0.1Mpa
The continuous pressure injection of cement slurry is entered in prestressed pore passage, cement slurries is waited to be flowed into pressure pot by grout outlet by mud jacking pump valve, is stood
Close the valve at vacuum pump, open the valve at waste pulp bucket, waste pulp are discharged into waste pulp recycling bin, etc. at waste pulp discharge
When concentration of cement is identical with concentration of cement at mud jacking injection, the valve at grout outlet is closed, continues slip casting, to mudjack
When pressure reaches 0.7Mpa, the valve of madjack pipe is closed, the mud jacking of prestressed pore passage is completed at one, carries out next prestressed pore passage
Mud jacking.
By using above-mentioned technical proposal, vacuum pump startup extracts air in prestressed pore passage, improves prestressed pore passage
Interior vacuum degree is conducive to be forced through in prestressed pore passage with cement, when cement is discharged in waste pulp bucket, illustrates water
Mud has been substantially filled with full prestressed pore passage, closes the valve at grout outlet at this time, and keeps continuing slip casting, prestressed pore passage
In cement pressure further increase, the cement solidifies after formed concrete be also finer and close.
Further, in S5, to sealing off and covering anchorage concrete strength up to 5 Mpa or more, sealing off and covering anchorage concrete surface is modified.
By using above-mentioned technical proposal, after sealing off and covering anchorage concrete strength is up to standard, staff can be repaired sealing off and covering anchorage concrete surface
Decorations improve the aesthetic measure of sealing off and covering anchorage concrete.
Further, in S3, when the stretching force of jack reaches 100% δ con, continue fuel feeding and maintain stretching force not
Become, is kept for load 5 minutes, measure practical elongation later.
By using above-mentioned technical proposal, when stretching force reaches a hundred percent, jack maintains stretching force constant
Continue 5 minutes, the presstressed reinforcing steel of staff's observation at this time illustrates presstressed reinforcing steel if the case where fracture does not occur in presstressed reinforcing steel
Quality reaches a standard, and staff could complete to carry out the detection of elongation later.
In conclusion the invention has the following advantages:
1. the transverse load and longitudinal loading due to box beam have differences, according to the difference of stress condition, longitudinal presstressed reinforcing steel
Using steel strands wound bunchy, lateral presstressed reinforcing steel is made using finish rolling deformed bar, according to different stress conditions, is selected most
For suitable presstressed reinforcing steel；It selects after suitable presstressed reinforcing steel, presstressed reinforcing steel is penetrated into the corresponding hole of box beam by construction personnel
In hole, opposite presstressed reinforcing steel carries out tension later, applies pulling force to presstressed reinforcing steel in advance, improves the bending resistance and just of box beam
Degree postpones the time that crack occurs, increases the durability of box beam, after the tensioning for completing presstressed reinforcing steel, in prestressed pore passage
Be filled with cement, air in prestressed pore passage extracted out, prestressed pore passage is in negative pressure state at this time, be conducive to cement be circulated into it is pre-
In stress duct, regardless of which type of shape is prestressed pore passage design be in, prestressed pore passage can sufficiently be full of prestressed pore passage,
After theing cement solidifies, make overall stiffness and bearing capacity that box beam is improved in prestress hole stronger ground box beam；
2. vacuum pump startup extracts air in prestressed pore passage, vacuum degree in prestressed pore passage is improved, is conducive to add with cement
Pressure is injected into prestressed pore passage, when cement is discharged in waste pulp bucket, illustrates that cement has been substantially filled with full prestressing force
The valve at grout outlet is closed in duct at this time, and keeps continuing slip casting, and the cement pressure in prestressed pore passage further mentions
Height, the concrete formed after theing cement solidifies is also finer and close；
3. the water-cement ratio of cement slurry is preferably 0.26 ~ 0.28, and the sludge age phase selected is no more than 1 month, and guarantee is had using cement
There is excellent adhering, is conducive to the fixed prestressed pore passage of the stronger filling of cement；Swelling agent appropriate is mixed in cement, in order to increase
The expansion character for adding cement, when theing cement solidifies, the volume of cement becomes larger, and guarantees to fill full prestress pipe；Blender
Revolving speed should be not less than 1000r/min, and cement is sufficiently stirred, improves the homogeneity of cement.
Detailed description of the invention
Fig. 1 is the step schematic diagram of presstressed reinforcing steel mud-jacking technology；
Fig. 2 is the structural schematic diagram that squeezing unit is used in box beam；
Fig. 3 is in box beam for embodying the structural schematic diagram of suction device
Fig. 4 is the prestressed pore passage construction schematic diagram of box beam；
Fig. 5 is the structural schematic diagram of presstressed reinforcing steel.
In figure, 1, box beam；11, prestressed pore passage；111, gas vent pipeline；12, presstressed reinforcing steel；121, anchorage；122, anchor
Side Template；2, squeezing unit；21, madjack pipe；22, mudjack；3, suction device；31, grout outlet；32, waste pulp bucket；33, pressure
Bucket；34, vacuum pump；35, transparent pipe.
Specific embodiment
Below in conjunction with attached drawing, invention is further described in detail.
Embodiment: a kind of presstressed reinforcing steel mud-jacking technology, as shown in Figure 1, comprising the following steps: presstressed reinforcing steel 12 designs, is pre-
The installation of stress rib 12,12 tensioning of presstressed reinforcing steel, mud jacking and sealing off and covering anchorage.
S1, presstressed reinforcing steel 12 design:.
As shown in figure 5, the presstressed reinforcing steel 12 that longitudinally uses of box beam 1 using high strength low relaxed steel strand wires winding bunchy and
At steel strand wires per share nominal area 139mm2, normal intensity 1860Mpa, 1.95 × 105Mpa of elasticity modulus design cable tensios control
Stress 1395Mpa.
The presstressed reinforcing steel 12 that box beam 1 laterally uses uses JL32mm finish rolling deformed bar, JL32mm finish rolling deformed bar mark
Quasi- intensity fpk=785Mpa, stretching control force 0.9fpk=706.5Mpa, single control stretching force 568.2KN.
S2, presstressed reinforcing steel 12 install: staff first according to drawing prefabricated case beam 1, as shown in figure 5, in box beam 1
Use the bellows of bellows vertical and horizontal several as prestressed pore passage 11, is provided with several exhausts on prestressed pore passage 11
Hole pipeline 111, gas vent pipeline 111 stretch out box beam 1.
As shown in figure 4, the shape of prestressed pore passage 11 can have linear, curved shape and fold-line-shaped, prestressed pore passage 11
Shape reasonably selected according to the actual situation.It is 11 curved shape of prestressed pore passage in this example.
As shown in figure 4, gas vent pipeline 111 is managed using φ 20mmPVC, prestressed pore passage 11 and gas vent pipeline 111
Junction is blocked with sealant, improves junction sealing performance.
As shown in figure 4, staff penetrates into presstressed reinforcing steel 12 in prestressed pore passage 11 first in box beam 1, prestressing force
The end of prestressed pore passage 11 is stretched out at the both ends of muscle 12, and the both ends of presstressed reinforcing steel 12 are provided with anchorage 121, and anchorage 121 is solid
It is scheduled on the opening at 11 both ends of prestressed pore passage, stress duct is sealed using foamed glue with 121 junction of anchorage, avoided subsequent
During carrying out mud jacking, occurs the case where spillage herein.
S3,12 tensioning of presstressed reinforcing steel: installing jack at the both ends of presstressed reinforcing steel 12 respectively, is answered in advance by jack pulling
Power muscle 12, first progress initial stress tensioning.
It is oil-filled to jack master cylinder, while anchorage 121 and jack position are adjusted, make prestressed pore passage 11,121 and of anchorage
The axis matches mutually of jack three is made elongation label when presstressed reinforcing steel 12 reaches 10% δ con of initial stress, is carried out later
Tensioning.
It is carried out using the method pressurizeed step by step, after every stretching a period of time, continues fuel feeding and maintain stretching force constant, when thousand
When the stretching force on jin top reaches 100% δ con, continue fuel feeding and maintain stretching force constant, is kept for load 5 minutes, measurement is practical later
Elongation, measures whether practical elongation is consistent with calculated value, if elongation is consistent with calculated value, increases pulling force and continues to draw
It stretches；Last presstressed reinforcing steel 12 anchors: anchorage 121 and presstressed reinforcing steel 12 is fixed, piston jack master cylinder oil extraction later, master cylinder
Backward stroke of the piston finally cuts off extra steel strand wires.
According to the difference of presstressed reinforcing steel 12, the parameter setting of tensioning is also different:
Presstressed reinforcing steel 12 is steel strand tension program: initial stress (0.1 ~ 0.2 σ con) → proof stress (σ con=0.75fpk) →
Keep load 5 minutes → anchoring, the value of initial stress is according to the length adjustment of presstressed reinforcing steel 12, and 12 length of presstressed reinforcing steel is in 30m
10% ~ 15% is taken when following, 12 length of presstressed reinforcing steel takes 15% ~ 20% in 30m ~ 60m, and 12 length of presstressed reinforcing steel takes when being greater than 60m
The upper limit 25%, steel strand wires Stress Control stress are δ con=0.75fpk=1395Mpa, sub-thread steel strand wires area of section A=139mm2.
Presstressed reinforcing steel 12 is finish rolling deformed bar stressing sequence: initial stress (0.1 σ con) → proof stress (σ con=
0.9fpk) → keep 5 minutes → proof stress of load (σ con=0.9fpk) → anchoring, finish rolling deformed bar control stress for prestressing
For δ con=0.9fpk=706.5Mpa, single control stretching force is 568.2KN.
S4, mud jacking: being equipped with squeezing unit 2 in one end of prestressed pore passage 11 respectively, in conjunction with shown in Fig. 2 and Fig. 4, mud jacking
Device 2 includes madjack pipe 21 and mudjack 22, and mudjack 22 is connect with madjack pipe 21, and madjack pipe 21 and prestressed pore passage 11 connect
It is logical.
In conjunction with shown in Fig. 3 and Fig. 4, the other end of prestressed pore passage 11 is equipped with suction device 3, and suction device 3 includes
Slurry pipe 31 and vacuum pump 34, the end of grout outlet 31 are connected with two transparent pipes 35, are mounted on valve on two transparent pipes 35,
Wherein a transparent pipe 35 is connected with waste pulp bucket 32, and another transparent pipe 35 is connected with pressure bottle, and pressure bottle is by pipeline and very
34 connection of sky pump, and pressure gauge is installed on pipeline.
Before mud jacking, cement is configured first, during preparing cement, the water-cement ratio of cement slurry is preferably 0.26 ~ 0.28, used
Cement age is no more than 1 month, and swelling agent appropriate is mixed in cement, and when mixing cement, the blender revolving speed used is answered
Not less than 1000r/min, guarantee that the cement used has good viscosity, dilatancy and homogeneity, when cement is in prestress hole
It will form the structure of compact in road 11 after coagulation forming.Gas vent pipeline 111 is all closed later, gas vent pipeline
111 are mainly used for promptly being vented use.
In conjunction with shown in Fig. 3 and Fig. 4, vacuum pump 34 extracts the air in prestressed pore passage 11, reaches -0.1Mpa to vacuum degree
When, 22 valve of mudjack is opened, the continuous pressure injection of cement slurry is entered in prestressed pore passage 11, cement slurries is waited to be flowed by grout outlet 31
In pressure pot 33, the valve at vacuum pump 34 is closed immediately, the valve at waste pulp bucket 32 is opened, waste pulp is discharged into waste pulp recycling bin
Interior, construction personnel at the scene can understand the case where cement flows by transparent pipe 35.
When concentration of cement at waste pulp discharge is identical with concentration of cement at mud jacking injection, close at grout outlet 31
Valve, continue slip casting, when 22 pressure of mudjack reaches 0.7Mpa, close the valve of madjack pipe 21, prestressed pore passage at one
11 mud jacking is completed, and next 11 mud jacking of prestressed pore passage is carried out.
S5, sealing off and covering anchorage: after the whole tensioning mud jacking of presstressed reinforcing steel 12 are completed, construction personnel uses hydraulic giant by water on anchorage 121
Mud is rinsed well, and presstressed reinforcing steel 12 is staying 3 ~ 5cm outside anchorage 121 at this time, and construction personnel, which uses, uses grinding wheel water cooling cutting machine
Part will be stayed to cut off outside presstressed reinforcing steel 12.
Anchor Side Template 122 is installed according to the shape of 11 end of prestressed pore passage later, and stays concrete anchor Side Template 122 is suitable for reading
Perfusing hole pours sealing off and covering anchorage concrete by concrete pouring mouth, and the end part seal of entire prestressed pore passage 11 is got up.It is reached to sealing off and covering anchorage concrete strength
5 Mpa or more stopping pours, and modifies sealing off and covering anchorage concrete surface, it is ensured that presentation quality.
This specific embodiment is only explanation of the invention, is not limitation of the present invention, those skilled in the art
Member can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but as long as at this
All by the protection of Patent Law in the scope of the claims of invention.
Claims (10)
1. a kind of presstressed reinforcing steel mud-jacking technology, it is characterised in that: the following steps are included:
S1, presstressed reinforcing steel (12) design: high strength low relaxed steel strand wires are used for the presstressed reinforcing steel (12) that box beam (1) longitudinally uses
Winding bunchy forms；It is used for the presstressed reinforcing steel (12) that box beam (1) laterally uses and rolls spiral；
S2, presstressed reinforcing steel (12) installation: prestressed pore passage (11), prestressing force are provided in box beam (1) using pre-buried method
Several gas vent pipelines (111) are set on duct (11), and gas vent pipeline (111) stretches out box beam (1) top surface, by presstressed reinforcing steel
(12) it penetrates wherein from one end of prestressed pore passage (11), is pierced by from the other end of prestressed pore passage (11), presstressed reinforcing steel (12)
Both ends be provided with anchorage (121)；
S3, presstressed reinforcing steel (12) tensioning: installing jack at the both ends of presstressed reinforcing steel (12) respectively, is answered in advance by jack pulling
Power muscle (12), first progress initial stress tensioning；It is oil-filled to jack master cylinder, while anchorage (121) and jack position are adjusted, make
The axis matches mutually of prestressed pore passage (11), anchorage (121) and jack three, when presstressed reinforcing steel (12) reaches initial stress
Make elongation label when 10% δ con；Tensioning is carried out later: being carried out using the method pressurizeed step by step, after every stretching a period of time,
Continuing fuel feeding maintains stretching force constant, measures whether practical elongation is consistent with calculated value, if elongation is consistent with calculated value, increases
Pulling force is added to continue to stretch；Last presstressed reinforcing steel (12) anchoring: anchorage (121) and presstressed reinforcing steel (12) are fixed, it lives later
The oil extraction of jack master cylinder is filled in, the backward stroke of the piston of master cylinder finally cuts off extra steel strand wires；
S4, mud jacking: it is equipped with squeezing unit (2) in one end of prestressed pore passage (11) respectively, squeezing unit (2) includes madjack pipe
(21) it is connect with mudjack (22), mudjack (22) with madjack pipe (21), madjack pipe (21) is connected to prestressed pore passage (11)；In advance
The other end in stress duct (11) is equipped with suction device (3), and suction device (3) includes grout outlet (31) and vacuum pump (34),
Grout outlet (31) and vacuum pump (34) connection, grout outlet (31) is connected to prestressed pore passage (11), before mud jacking, configures water first
Mud later all closes gas vent pipeline (111), when mud jacking, first turns on vacuum pump (34) and extracts prestressed pore passage (11)
In air, open mudjack (22), the continuous pressure injection of cement slurry enters in prestressed pore passage (11), after waiting for a period of time, will
Valve at vacuum pump (34) and grout outlet (31) is successively closed, while continuing mud jacking, is reached to cement in prestressed pore passage (11)
To after certain pressure, closes madjack pipe (21) valve and stop slip casting；
S5, sealing off and covering anchorage: after presstressed reinforcing steel (12) whole tensioning mud jacking are completed, anchorage (121) is rinsed well, and by prestress hole
After the reinforcing bar processing being truncated at road (11) notch is clean, anchor Side Template (122) are installed on anchorage (121), and in template
Mouth stays concrete pouring mouth, pours sealing off and covering anchorage concrete.
2. a kind of presstressed reinforcing steel mud-jacking technology according to claim 1, it is characterised in that: in S1, the per share public affairs of steel strand wires
Claim area 139mm2, normal intensity 1860Mpa, 1.95 × 105Mpa of elasticity modulus, designs control stress for prestressing 1395Mpa；Essence
Roll spiral normal intensity fpk=785Mpa, stretching control force 0.9fpk=706.5Mpa, single control stretching force 568.2KN.
3. a kind of presstressed reinforcing steel mud-jacking technology according to claim 1, it is characterised in that: the prestressed pore passage (11) is adopted
With bellows, the shape of prestressed pore passage (11) has linear, curved shape and fold-line-shaped, and gas vent pipeline (111) uses φ
20mmPVC pipe, prestressed pore passage (11) and the junction of gas vent pipeline (111) are blocked with sealant, prestressed pore passage (11)
It is sealed with anchorage (121) junction using foamed glue.
4. a kind of presstressed reinforcing steel mud-jacking technology according to claim 1, it is characterised in that: in S3, presstressed reinforcing steel (12)
For steel strand tension program: initial stress (0.1 ~ 0.2 σ con) → proof stress (σ con=0.75fpk) → holding load 5 minutes →
Anchoring, the value of initial stress according to the length adjustments of presstressed reinforcing steel (12), presstressed reinforcing steel (12) length takes 10% in 30m or less ~
15%, presstressed reinforcing steel (12) length takes 15% ~ 20% in 30m ~ 60m, capping 25% when presstressed reinforcing steel (12) length is greater than 60m,
Steel strand wires Stress Control stress is δ con=0.75fpk=1395Mpa, sub-thread steel strand wires area of section A=139mm2.
5. a kind of presstressed reinforcing steel mud-jacking technology according to claim 1, it is characterised in that: in S3, presstressed reinforcing steel (12)
For finish rolling deformed bar stressing sequence: initial stress (0.1 σ con) → proof stress (σ con=0.9fpk) → holding load 5 minutes
→ proof stress (σ con=0.9fpk) → anchoring, finish rolling deformed bar control stress for prestressing are δ con=0.9fpk=706.5Mpa,
Single control stretching force is 568.2KN.
6. a kind of presstressed reinforcing steel mud-jacking technology according to claim 1, it is characterised in that: in S4, preparing cement mistake
Cheng Zhong, the water-cement ratio of cement slurry are preferably 0.26 ~ 0.28, and cement age used is no more than 1 month, and mixes in cement appropriate
Swelling agent, when mixing cement, the blender revolving speed used should be not less than 1000r/min.
7. a kind of presstressed reinforcing steel mud-jacking technology according to claim 1, it is characterised in that: in S4, grout outlet (31)
End is connected with two transparent pipes (35), is mounted on valve on two transparent pipes (35), wherein transparent pipe (35) connection
Having waste pulp bucket (32), another transparent pipe (35) is connected with pressure bottle, and pressure bottle is connect by pipeline with vacuum pump (34), and
Pressure gauge is installed on pipeline.
8. a kind of presstressed reinforcing steel mud-jacking technology according to claim 7, it is characterised in that: in S4, vacuum pump (34) is taken out
The air in prestressed pore passage (11) is taken, when vacuum degree reaches -0.1Mpa, opens mudjack (22) valve, cement slurry is continuous
Pressure injection enters in prestressed pore passage (11), waits cement slurries to be flowed into pressure pot (33) by grout outlet (31), closes vacuum immediately
Pump the valve at (34), open the valve at waste pulp bucket (32), waste pulp are discharged into waste pulp recycling bin, etc. water at waste pulp discharge
When mud concentration is identical with concentration of cement at mud jacking injection, the valve at grout outlet (31) is closed, continues slip casting, to mud jacking
When pump (22) pressure reaches 0.7Mpa, the valve of madjack pipe (21) is closed, the mud jacking of prestressed pore passage (11) is completed at one, is carried out
Next prestressed pore passage (11) mud jacking.
9. a kind of presstressed reinforcing steel mud-jacking technology according to claim 1, it is characterised in that: in S5, to sealing off and covering anchorage concrete strength
Up to 5 Mpa or more, sealing off and covering anchorage concrete surface is modified.
10. a kind of presstressed reinforcing steel mud-jacking technology according to claim 1, it is characterised in that: in S3, as of jack
When pulling force reaches 100% δ con, continue fuel feeding and maintain stretching force constant, is kept for load 5 minutes, measure practical elongation later.
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| CN111733707A (en) * | 2020-07-31 | 2020-10-02 | 陈宇豪 | Bridge prestressed duct grouting device and construction method |
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| CN112045837A (en) * | 2020-09-01 | 2020-12-08 | 中国建筑土木建设有限公司 | Slurry inflow prevention device and construction method for vacuum grouting by using same |
| CN112227725A (en) * | 2020-11-11 | 2021-01-15 | 中交第四公路工程局有限公司 | Grouting structure of long pore passage of prestressed concrete stiffening beam and construction method thereof |
| CN114393685A (en) * | 2021-12-31 | 2022-04-26 | 江西省交通工程集团有限公司 | Grouting method for T-shaped beam |
| CN114908684A (en) * | 2022-06-08 | 2022-08-16 | 中铁一局集团(广州)建设工程有限公司 | Construction method of suspended casting box girder cradle method |
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| CN114393685A (en) * | 2021-12-31 | 2022-04-26 | 江西省交通工程集团有限公司 | Grouting method for T-shaped beam |
| CN114393685B (en) * | 2021-12-31 | 2024-06-11 | 江西省交通工程集团有限公司 | Grouting method for T beam |
| CN114908684A (en) * | 2022-06-08 | 2022-08-16 | 中铁一局集团(广州)建设工程有限公司 | Construction method of suspended casting box girder cradle method |
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