CN110106779A - A kind of prefabrication type bent cap and its construction method - Google Patents
A kind of prefabrication type bent cap and its construction method Download PDFInfo
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- CN110106779A CN110106779A CN201910369799.4A CN201910369799A CN110106779A CN 110106779 A CN110106779 A CN 110106779A CN 201910369799 A CN201910369799 A CN 201910369799A CN 110106779 A CN110106779 A CN 110106779A
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- bent cap
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- bellows
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- 238000009417 prefabrication Methods 0.000 title claims abstract description 37
- 238000010276 construction Methods 0.000 title claims abstract description 22
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 20
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- 210000003205 muscle Anatomy 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 239000004568 cement Substances 0.000 claims description 13
- 238000007569 slipcasting Methods 0.000 claims description 9
- 238000013461 design Methods 0.000 claims description 8
- 238000004080 punching Methods 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 6
- 239000011230 binding agent Substances 0.000 claims description 5
- 238000004873 anchoring Methods 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 4
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- 239000004570 mortar (masonry) Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 6
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- 238000005266 casting Methods 0.000 description 3
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- 229910000831 Steel Inorganic materials 0.000 description 2
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- 229920000647 polyepoxide Polymers 0.000 description 2
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- 239000000725 suspension Substances 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
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- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 210000004262 dental pulp cavity Anatomy 0.000 description 1
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Classifications
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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
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
-
- 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
Abstract
The present invention relates to bridge member technical fields, more particularly to a kind of prefabrication type bent cap and its construction method, it aims to solve the problem that the mechanical property of prefabrication type bent cap is bad, be easy to generate crack or loose, complicated construction technique, defect at high cost inside piece, technical points are to include multiple prefabricated components, complete bent cap is formed between prefabricated component after split, prefabricated component includes a channel and several strip pieces, the upper surface of channel offers groove body, in the groove body that strip piece is partly or entirely inlaid in channel after the completion of bent cap split；The quadrangle of strip piece is equipped with the embedded bar that strip piece is stretched out in end, embedded bar side is equipped with the bellows that end communicates with the outside world, embedded bar and bellows are arranged in parallel and the two outer sheath is equipped with reinforcing rib, and by embedded bar to be inserted in bellows post-grouting realization affixed for two neighboring strip piece.The present invention has many advantages, such as that mechanical strength is high, construction technology is simple, hoisting difficulty is low, in conjunction with firm.
Description
Technical field
The present invention relates to bridge member technical fields, and in particular to a kind of prefabrication type bent cap and its construction method.
Background technique
Bent cap refers to the load for bearing, distribution and transmitting bridge superstructure, in a kind of cross of pier coping portion setting
Beam.The main function of bent cap is supporting bridge superstructure, and whole load is conducted to bridge pier, therefore bent cap is bridge
Main bearing member.
Currently, reducing site environment pollution and the interference to present situation traffic, bridge construction process to accelerate construction progress
In be generally prefabricated in the factory to transport to scene after associated components again and carry out assembled form in advance and constructed.It is right in the prior art
In bent cap part it is prefabricated it is general carried out by the way of segmentation, i.e., bent cap is divided into the longitudinal direction several segments carry out it is pre-
System, then transports to scene and is spliced.
To disclose a kind of fragment prefabricated for the utility model patent that existing Chinese patent Authorization Notice No. is CN202298446U
Assembled bent cap, including multiple pre-constructed units for being assembled into bent cap；The pre-constructed unit is that the bent cap divides along its length
Cut the prefabricated bent cap of multi-disc fragment to be formed；The prefabricated bent cap of fragment described in multi-disc is formed in assembly using prestressing force connection type solid
Fixed connection.The length of the prefabricated bent cap of fragment is identical as the length of the bent cap.By the way that bent cap is divided into several length
Monolithic identical with bent cap entire length come reach using support bent cap pier column as construction bracket, do not need constructing
The purpose of live erect bracket again；Simultaneously because bent cap is not divided into several segments, the mechanical property of bent cap in the longitudinal direction
It can be guaranteed.
However, bent cap disclosed in above-mentioned technical proposal still has problem in actual use: firstly, by bent cap in length
If, when each fragment of bent cap is identical by pressure straight down, mechanical property can after being divided into dry plate on degree direction
To reach the level with the bent cap equality strength of one-piece casting, but when bent cap generates slight deformation or inclination, displacement,
The pressure being subject between each fragment of bent cap can change, this will result in the internal stress of bent cap entirety, especially piece
The internal stress at place changes, just may cause after being changed to a certain degree generated inside piece crack, it is loose the defects of；Secondly,
During splicing to the bent cap provided in above-mentioned technical proposal, it is attached due to needing to pour slurry into piece,
And piece is structure up and down, therefore during pouring slurry, slurry flows under bridge still along piece in order to prevent
It needs to carry out bent cap fixed in advance and builds template, while guaranteeing that slurry is full of entire piece, reduce slurry and fall under bridge
Probability, therefore the construction technology of the bent cap in above-mentioned technical proposal still has certain complexity.
Summary of the invention
Therefore, the technical problem to be solved in the present invention is that overcoming the mechanical property of prefabrication type bent cap in the prior art not
It is good, be easy to generate crack or loose defect inside piece, to provide a kind of prefabrication type bent cap.
Above-mentioned technical purpose of the invention has the technical scheme that
A kind of prefabrication type bent cap, including multiple prefabricated components extended along bent cap length direction, split between the prefabricated component
After form complete bent cap, the prefabricated component includes a channel and several strip pieces, and the upper surface of the channel is opened
Equipped with the groove body extended along bent cap length direction, several strip pieces are partly or entirely inlaid in slot after the completion of bent cap split
In the groove body of shape part；
The quadrangle of the strip piece is equipped with the embedded bar that strip piece is stretched out in end, and the embedded bar side is equipped with end
The bellows that portion communicates with the outside world, the embedded bar and the bellows are arranged in parallel and the two outer sheath is equipped with reinforcing rib,
And the two neighboring strip piece by embedded bar be inserted in bellows post-grouting realize it is affixed.
Optionally, the embedded bar includes the first vertical muscle and the second vertical muscle being each located on different parallel planes, institute
It states and is equipped with several evenly spaced horizontal bars between the first vertical muscle and the second vertical muscle, and connected by horizontal bar cross-fixing.
Optionally, the reinforcing rib is that helical form or closed circular are cyclic annular, and the reinforcing rib internal diameter be greater than bellows and
Total outer diameter of embedded bar.
Optionally, the bellows side is equipped with injected hole, and the other side is equipped with gas vent, the injected hole and gas vent
It is extended to outside the strip piece by pvc pipe.
Optionally, the splice ends of the strip piece, which are equipped with, is embedded with water-swellable along its circumferential groove, the groove
Sealing rod.
Another object of the present invention is to overcome the complicated construction technique of prefabrication type bent cap in the prior art, at high cost lack
It falls into, to provide a kind of construction method of prefabrication type bent cap.
A kind of construction method of prefabrication type bent cap, comprising the following steps:
S1, according to design size pregroove part and strip piece；
S2, channel is installed at the top of the cylindrical portion of bridge pier, then pours support pinner in the top surface two sides of groove body；
Using extraordinary flat car transport, the cooperation of You Liangtai loop wheel machine is unloaded, and passes through mounted dragon for S3, strip piece
Gantry crane lifting；
S4, it is laid with screed-coat between support pinner, while is laid with tetrafluoro slide plate in support pinner top surface；
S5, the section strip piece for being located at notch is fixedly mounted, then hangs onto subsequent strip piece on tetrafluoro slide plate, and
It is in place that sequentially lifting is carried out according to design configurations figure；
After S6, every installation 4-5 save strip piece, tensioning, and one are carried out to the end of strip piece simultaneously using four jack
Secondary property is stretched to 200kN, to guarantee that prestressing force can be applied on the water expandable waterstop interface of two strip piece splice ends；
Strip piece is anchored when S7, tensioning, i.e., it is primary every 6-8m anchoring；
S8, the bellows pressure injection cement slurry by injected hole into strip piece, and 24 in slip casting completion are small
When it is interior do not disturb, finally filled with mortar and smooth out gas vent and injected hole；
S9, the SBS heat molten type waterproof roll that 50cm wide is laid at the outer side seam of strip piece.
Optionally, in the step S3, the strip piece passes through the main loop wheel machine of a 350t and the auxiliary loop wheel machine of a 130t
Carry out vertical position transport.
Optionally, in the step S4, the screed-coat is the cement and yellow ground mixture of 25mm thickness, and the screed-coat is high
Degree is greater than support pinner height 5mm, and the tetrafluoro slide plate thickness 3mm, width 40cm, long 50cm.
Optionally, in the step S6, pushing tow adjustment is carried out using 25T punching jack, the punching jack is fixed
The quadrangle of strip piece after splicing.
Optionally, in the step S8, the cement slurry is starched for a kind of high-intensitive, shrinkage-free binder, during mud jacking
Pressure be set as 0.6Mpa, voltage stabling control is set as 3 minutes.
Technical solution of the present invention has the advantages that
1. prefabrication type bent cap of the invention is spelled between prefabricated component including multiple prefabricated components extended along bent cap length direction
Complete bent cap is formed after conjunction, prefabricated component includes a channel and several strip pieces, and the upper surface of channel offers edge
The groove body that bent cap length direction extends, several strip pieces are partly or entirely inlaid in the groove body of channel after the completion of bent cap split
It is interior, to be not only able to reach and reduce site operation difficulty, reduce after the prefabricated bent cap of conventional segmented is designed to above-mentioned form
Environmental pollution, the purpose for reducing monolithic prefabricated component weight, simultaneously because bent cap uses the form of channel and strip piece split,
Strip piece is under the groove body package status of channel so that bent cap is under outer load action, stress and deformation it is maximum be slot
The piece stress of shape part and strip piece itself, channel and strip piece is relatively small, and can reach the lid with one-piece casting
The same intensity of beam, greatly improves the mechanical property of prefabrication type bent cap.
2. prefabrication type bent cap of the invention, the quadrangle of strip piece is equipped with the embedded bar that strip piece is stretched out in end, pre-buried
Reinforcing bar side is equipped with the bellows that end communicates with the outside world, and two neighboring strip piece is passed through pre-buried steel to lift by crane using loop wheel machine
Muscle be inserted in bellows post-grouting, it can be achieved that multiple strip pieces it is affixed, have site operation short time limit, be easy to guarantee construct matter
Amount, the advantages such as durability is good；Meanwhile embedded bar and bellows are arranged in parallel and the two outer sheath is equipped with reinforcing rib, it can be effective
The cross rib oblique compression cone wedge effect between lap segment reinforcing bar is constrained, the development for causing longitudinal splitting crack is prevented.
3. prefabrication type bent cap of the invention, the setting of embedded bar, including be each located on different parallel planes first
Vertical muscle and the second vertical muscle, are provided with several evenly spaced horizontal bars, pass through the level between the first vertical muscle and the second vertical muscle
Muscle realizes that the first vertical muscle is connect with the cross-fixing of the second vertical muscle, to increase the contact surface with bellows after slurry is perfused
Product reaches and communicates with site concrete or similar bearing capacity and while anti-seismic performance, can reduce lapped length of steel bar
On the basis of avoid embedded bar from being pulled off destruction.
4. prefabrication type bent cap of the invention, using helical form or the cricoid reinforcing rib of closed circular to embedded bar and bellows
Corresponding lateral confinement is played, the global consistency between adjacent bar part is improved, resists deformation caused by soil body differential settlement；
Meanwhile the internal diameter of reinforcing rib is greater than total outer diameter of bellows and embedded bar, consequently facilitating being arranged when assembly strip piece.
5. prefabrication type bent cap of the invention opens up injected hole in bellows side, gas vent is arranged in the other side, and utilizes
Pvc pipe extends to outside strip piece, to carry out grouting operation by injected hole, while grout blanket is filled, slurry can be from exhaust
Hole is overflowed, that is, is represented bellows and filled by slurry, and should not have disturbance in the twenty four hours that slip casting is completed, and is finally sealed
Stifled gas vent and injected hole, it can be ensured that slurry is closely knit in bellows.
6. prefabrication type bent cap of the invention, water expandable waterstop is embedded in the circumferential recess of strip piece splice ends,
To realize strip piece it is affixed after, water expandable waterstop can effectively inhibit water from seam crossing endosmosis, improve whole make
Use the service life.
7. prefabrication type bent cap of the invention, first according to design size pregroove part and strip piece, in bridge pier when construction
Cylindrical portion at the top of channel is installed, then in order to ensure the lifting of each strip piece it is in place after keep horizontal, in the coagulation of groove body
Native top surface two sides pour the support pinner below strip piece, and for the ease of segment installation, are laid between support pinner
Screed-coat, the screed-coat are cement and the yellow ground mixture of 25mm thickness to carry out levelling and reduce friction, while in support pinner
Top surface is laid with tetrafluoro slide plate in order to which subsequent pushing tow adjusts or tensioning operation, specifically, the section for being located at notch is fixedly mounted
Then strip piece hangs onto subsequent strip piece on tetrafluoro slide plate, and carry out sequentially lifting in place according to design configurations figure, from
And make in the bellows of its embedded bar alignment insertion front adjacent bar part, it is affixed to realize, then use 25T punching jack
The both ends of strip piece after splicing are fixed on to carry out pushing tow adjustment, therewith in order to guarantee that prestressing force is effectively applied to water-swellable
On the interface of sealing rod, and in view of needing to generate certain displacement when tensing operation, after every installation 4-5 saves strip piece, use
Four 25T punching jack being located on strip piece quadrangle carry out tensioning to the end of strip piece simultaneously, and are disposably stretched to
200kN, when tensioning, anchor strip piece, i.e., primary every 6-8m anchoring, after stretch-draw anchor, by injected hole to strip piece
Interior bellows carries out grouting treatment, i.e., by a kind of high-intensitive, shrinkage-free cement slurry of injected hole pressure injection, by grout blanket
While filling, slurry can be overflowed from gas vent, and not disturbed in the twenty four hours that slip casting is completed, and finally be filled out with mortar
It fills and smoothes out gas vent and injected hole, it is ensured that slurry is closely knit in bellows, between the condensation hardening realization Bar Anchorage of grouting material
It connects in succession, the SBS heat molten type waterproof roll of 50cm wide is finally laid at the outer side seam of strip piece.
8. prefabrication type bent cap of the invention, the main loop wheel machine of a 350t and the good position in auxiliary loop wheel machine station of a 130t are first allowed, and
It lifts strip piece simultaneously to stand up but without departing from ground, then main loop wheel machine hangs vertical strip piece and rises, and auxiliary loop wheel machine remains stationary, and makes bar shaped
Part slowly turns, and transfers the suspension hook of auxiliary loop wheel machine again after main loop wheel machine hangs strip piece completely and releases wirerope, to adopt
The mode transported with this vertical position, to guarantee transportation safety.
9. prefabrication type bent cap of the invention, grouting treatment is carried out using high-intensitive, shrinkage-free binder slurry, and by mud jacking mistake
Pressure in journey is set as 0.6Mpa, voltage stabling control is set as 3 minutes, it can be ensured that slurry is closely knit in bellows, can be with grouting
Being indirectly connected with for Bar Anchorage is realized in the condensation hardening of material, and strip piece is made to connect into structure entirety.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the structural schematic diagram of the prefabrication type bent cap of one embodiment of the present invention；
Fig. 2 is the part-structure explosive view of the prefabrication type bent cap of one embodiment of the present invention；
Fig. 3 is the cross-sectional view of the prefabrication type bent cap of one embodiment of the present invention；
Fig. 4 is the enlarged diagram of part A in Fig. 3.
Description of symbols:
1, channel；11, groove body；2, strip piece；21, embedded bar；211, the first vertical muscle；212, the second vertical muscle；213,
Horizontal bar；22, bellows；23, reinforcing rib；24, injected hole；25, gas vent；26, groove；27, water expandable waterstop.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Embodiment 1:
A kind of prefabrication type bent cap, as shown in Figure 1, include it is multiple along bent cap length direction extend prefabricated components, prefabricated component it
Between complete bent cap is formed after split, prefabricated component includes a channel 1 and several strip pieces 2, and the upper surface of channel 1 is opened
Equipped with the groove body 11 extended along bent cap length direction, several strip pieces 2 are partly or entirely inlaid in slot after the completion of bent cap split
In the groove body 11 of shape part 1, to be not only able to reach reduction scene after the prefabricated bent cap of conventional segmented is designed to above-mentioned form
Difficulty of construction, the purpose for reducing environmental pollution, reducing monolithic prefabricated component weight, while can also be bent cap in existing precasting process
On bring following improvement: since bent cap uses the form of 2 split of channel 1 and strip piece, strip piece 2 is in channel 1
Under 11 package status of groove body so that bent cap is under outer load action, stress and deformation it is maximum be channel 1 and strip piece 2
The piece stress of body, channel 1 and strip piece 2 is relatively small, and can reach the intensity same with the bent cap of one-piece casting,
Greatly improve the mechanical property of prefabrication type bent cap.Further, as shown in Figure 3 and Figure 4, the quadrangle of strip piece 2 is equipped with end
The embedded bar 21 of strip piece 2 is stretched out, 21 side of embedded bar is equipped with the bellows 22 that end communicates with the outside world, thus using hanging
Two neighboring strip piece 2 is inserted in 22 post-grouting of bellows by embedded bar 21, it can be achieved that multiple strip pieces 2 by machine lifting
It is affixed, there is site operation short time limit, be easy to guarantee construction quality, the advantages such as durability is good.Meanwhile embedded bar 21 and ripple
Pipe 22 is arranged in parallel and the two outer sheath is equipped with reinforcing rib 23, can cross rib oblique compression cone wedge between operative constraint lap segment reinforcing bar
Effect, prevents the development for causing longitudinal splitting crack.
As shown in figure 4, embedded bar 21 includes the first vertical muscle 211 and the second vertical muscle being each located on different parallel planes
212, several evenly spaced horizontal bars 213 are provided between the first vertical muscle 211 and the second vertical muscle 212, pass through the horizontal bar
213 the first vertical muscle 211 of realization are connect with the cross-fixing of the second vertical muscle 212, to increase and bellows 22 after slurry is perfused
Contact area, reach and communicated with site concrete or similar bearing capacity and while anti-seismic performance, can be taken reducing reinforcing bar
Embedded bar 21 is avoided to be pulled off destruction on the basis of spreading degree.
As shown in figure 4, the internal diameter of reinforcing rib 23 is greater than total outer diameter of bellows 22 and embedded bar 21 in order to be arranged,
In this embodiment of the invention, reinforcing rib 23 is spiral helicine spring stirrup, by the reinforcing rib 23 to embedded bar 21 and ripple
Pipe 22 plays corresponding lateral confinement.Meanwhile according to the effect of contraction of lap-joint require, can appropriate adjustment spring stirrup spiral
Spacing not only ensure that and anti-seismic performance comparable in cast in place process, but also the anchorage length that shortens that overlapped.In other embodiments
In, the cricoid reinforcing rib 23 of closed circular can be used also to realize same technical effect.
For the ease of grouting material is perfused in bellows 22, as shown in Figure 3 and Figure 4, slip casting is opened up in 22 side of bellows
Gas vent 25 is arranged in its other side in hole 24, and the injected hole 24 and gas vent 25 are extended to outside strip piece 2 by pvc pipe.Therefore
Grouting operation is carried out by injected hole 24, while grout blanket is filled, slurry can be overflowed from gas vent 25, that is, represent bellows
22 are filled by slurry, and should not have disturbance in the twenty four hours that slip casting is completed, and finally block gas vent 25 and slip casting
Hole 24, it is ensured that slurry is closely knit in bellows 22.
As shown in Fig. 2, the splice ends of strip piece 2, which are provided with, is embedded with chance water along its circumferential groove 26, the groove 26
Expansion sealing strip 27, thus realize it is affixed after, water expandable waterstop 27 can effectively inhibit water from seam crossing endosmosis, destroy
Connection structure between strip piece 2 influences the service life of this prefabrication type bent cap.
Embodiment 2:
A kind of construction method applied to embodiment 1, with reference to Fig. 1-4, comprising the following steps:
S1, according to design size pregroove part 1 and strip piece 2；
S2, channel 1 is installed at the top of the cylindrical portion of bridge pier, then in order to ensure each strip piece 2 lifts rear guarantor in place
Water holding is flat, pours the support pinner below strip piece 2 in the top of concrete two sides of groove body 11, support pinner thickness 2cm,
Wide 50cm, long 60cm, are poured using C40 micro aggregate concrete, and before pouring, and first to be dug to 11 top surface of groove body
Hair processing, exposing rubble ensures that pinner is supported sufficiently to connect with original basis；
S3, strip piece 2 are using extraordinary flat car transport, and the cooperation of You Liangtai loop wheel machine is unloaded, and by mounted
Gantry crane lifting；
Further, for transportation safety, strip piece 2 needs to need to overturn after then unloading by the way of the transport of vertical position,
First allow the main loop wheel machine of a 350t and the good position in auxiliary loop wheel machine station of a 130t, and lift simultaneously strip piece 2 stand up but without departing from
Ground, then main loop wheel machine hangs vertical strip piece 2 and rises, and auxiliary loop wheel machine remains stationary, and turns strip piece 2 slowly, to main loop wheel machine
The suspension hook of auxiliary loop wheel machine is transferred again after hanging strip piece 2 completely and releases wirerope；
S4, for the ease of segment installation, support pinner between be laid with screed-coat, the screed-coat be 25mm thickness cement with
Yellow ground mixture rubs to carry out levelling and reduction, and wherein cement yellow ground is dried object, and ratio 1:3, yellow ground is by screening
Fine sand, mixed whole height be greater than support pinner height 5mm；
Tetrafluoro slide plate is laid in order to which subsequent pushing tow adjusts or tensioning operation in support pinner top surface simultaneously, and the tetrafluoro is sliding
Plate thickness 3mm, width 40cm, long 50cm, the bonding agent used is epoxy resin；
S5, the section strip piece 2 for being located at notch is fixedly mounted, subsequent strip piece 2 is then hung into tetrafluoro slide plate 32
On, and sequentially lifting is carried out in place according to design configurations figure, to make its embedded bar 21 alignment insertion front adjacent bar part 2
Bellows 22 in, it is affixed to realize, then with 25T punching jack be fixed on splicing after strip piece 2 both ends to be pushed up
Push away adjustment, it is ensured that the central axes, sideline of strip piece 2 are aligned with central axes, the sideline that basic top surface releases respectively after splicing, are also risen
To preventing the effect ground one's teeth, disconnected between strip piece 2, and as shown in Fig. 2, each strip piece 2 is in place before, in two phases
It opens up at the splice ends of adjacent strip piece 2 along its circumferential groove 26, with epoxies binder by water expandable waterstop 27
Stickup is embedded to groove 26, realizes the function of seam waterproof；
S6, in order to guarantee that prestressing force is effectively applied on the interface of water expandable waterstop 27, and in view of tense make
Need to generate certain displacement when industry, after every installation 4-5 saves strip piece 2, the 25T being located on 2 four jiaos of strip piece using four is worn
Heart jack carries out tensioning to the end of strip piece 2 simultaneously, and is disposably stretched to 200kN, to guarantee that prestressing force can be applied to
On 27 interface of water expandable waterstop of two strip pieces, 2 splice ends；
Strip piece 2 is anchored when S7, tensioning, i.e., it is primary every 6-8m anchoring；
After S8, stretch-draw anchor, grouting treatment is carried out by bellows 22 of the injected hole 24 into strip piece 2, that is, passes through note
A kind of high-intensitive, shrinkage-free cement slurry of 24 pressure injection of hole is starched, while grout blanket is filled, slurry can overflow from gas vent 25
Out, and in the twenty four hours that slip casting is completed it does not disturb, is finally filled with mortar and smooth out gas vent 25 and injected hole 24, really
Slurry is closely knit in guarantor's bellows 22, realizes being indirectly connected with for Bar Anchorage with the condensation hardening of grouting material, makes to connect between strip piece 2
It is connected into structure entirety；
Wherein, cement slurry is formulated using finished product binder slurry, and every disk cement slurry is according to grouting material: water=100:28 matches
Than being controlled, mud jacking uses single mud-jacking technology, every root canal road mud jacking from one end to the other side, sets pressure during this
It is set in 3 minutes in 0.6Mpa, voltage stabling control；
S9, the SBS heat molten type waterproof roll that 50cm wide is laid at the outer side seam of strip piece 2.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or
It changes still within the protection scope of the invention.
Claims (10)
1. a kind of prefabrication type bent cap, including multiple prefabricated components extended along bent cap length direction, between the prefabricated component after split
Form complete bent cap, which is characterized in that the prefabricated component includes a channel (1) and several strip pieces (2), the slot
The upper surface of shape part (1) offers the groove body (11) extended along bent cap length direction, and several strip pieces (2) are in bent cap split
It is partly or entirely inlaid in the groove body (11) of channel (1) after the completion；
The quadrangle of the strip piece (2) is equipped with the embedded bar (21) that strip piece (2) are stretched out in end, the embedded bar (21)
Side is equipped with the bellows (22) that communicates with the outside world of end, the embedded bar (21) and the bellows (22) be arranged in parallel and
The two outer sheath is equipped with reinforcing rib (23), and the two neighboring strip piece (2) is inserted in ripple by embedded bar (21)
It is affixed to manage (22) post-grouting realization.
2. a kind of prefabrication type bent cap according to claim 1, which is characterized in that the embedded bar (21) includes each self-alignment
In the first vertical muscle (211) and the second vertical muscle (212) on different parallel planes, the first vertical muscle (211) and the second vertical muscle
(212) it is equipped with several evenly spaced horizontal bars (213) between, and is connected by horizontal bar (213) cross-fixing.
3. a kind of prefabrication type bent cap according to claim 1, which is characterized in that the reinforcing rib (23) is helical form or envelope
Annular shape is closed, and the reinforcing rib (23) internal diameter is greater than total outer diameter of bellows (22) and embedded bar (21).
4. a kind of prefabrication type bent cap according to claim 1, which is characterized in that bellows (22) side is equipped with slip casting
Hole (24), the other side are equipped with gas vent (25), and the injected hole (24) and gas vent (25) extend to the item by pvc pipe
Shape part (2) is outside.
5. a kind of prefabrication type bent cap according to claim 1, which is characterized in that the splice ends of the strip piece (2) are equipped with
The groove (26) circumferential along it, the groove (26) is interior to be embedded with water expandable waterstop (27).
6. a kind of construction method of prefabrication type bent cap, which comprises the following steps:
S1, according to design size pregroove part (1) and strip piece (2)；
S2, channel (1) is installed at the top of the cylindrical portion of bridge pier, then pours support pinner in the top surface two sides of groove body (11)；
Using extraordinary flat car transport, the cooperation of You Liangtai loop wheel machine is unloaded, and passes through mounted dragon for S3, strip piece (2)
Gantry crane lifting；
S4, it is laid with screed-coat between support pinner, while is laid with tetrafluoro slide plate in support pinner top surface；
S5, the section strip piece (2) for being located at notch is fixedly mounted, subsequent strip piece (2) is then hung into tetrafluoro slide plate
(32) on, and sequentially lifting is carried out in place according to design configurations figure；
After S6, every installation 4-5 save strip piece (2), tensioning is carried out to the end of strip piece (2) simultaneously using four jack, and
It disposably is stretched to 200kN, to guarantee that prestressing force can be applied to the water expandable waterstop positioned at two strip pieces (2) splice ends
(27) on interface；
Strip piece (2) is anchored when S7, tensioning, i.e., it is primary every 6-8m anchoring；
S8, pass through bellows (22) the pressure injection cement slurry of injected hole (24) into strip piece (2), and two completed in slip casting
It is not disturbed in 14 hours, is finally filled with mortar and smooth out gas vent (25) and injected hole (24)；
S9, the SBS heat molten type waterproof roll that 50cm wide is laid at the outer side seam of strip piece (2).
7. a kind of construction method of prefabrication type bent cap according to claim 6, which is characterized in that in the step S3, institute
It states strip piece (2) and vertical position transport is carried out by the main loop wheel machine of 350t and the auxiliary loop wheel machine of a 130t.
8. a kind of construction method of prefabrication type bent cap according to claim 6, which is characterized in that in the step S4, institute
The cement and yellow ground mixture that screed-coat is 25mm thickness are stated, the levelling layer height is greater than support pinner height 5mm, and described
Tetrafluoro slide plate thickness 3mm, width 40cm, long 50cm.
9. a kind of construction method of prefabrication type bent cap according to claim 6, which is characterized in that in the step S6, adopt
Pushing tow adjustment is carried out with 25T punching jack, the punching jack is fixed on the quadrangle of strip piece (2) after splicing.
10. a kind of construction method of prefabrication type bent cap according to claim 6, which is characterized in that in the step S8, institute
Stating cement slurry is a kind of high-intensitive, shrinkage-free binder slurry, and the pressure during mud jacking is set as 0.6Mpa, voltage stabling control setting
It is 3 minutes.
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Application publication date: 20190809 |