Agent structure wall prestressed structure and time building method of agent structure wall
The present invention relates to Construction Technique of Underground Works field, particularly relate to agent structure wall construction and improve and agent structure wall
Return building method improve.
During underground engineering cut and cover tunneling, the deep foundation pit support of larger proportion uses " vertical retaining structure+multiple tracks
Support " design, such as: vertical retaining structure uses SMW engineering method stake, cast-in-situ bored pile or diaphram wall, wherein,
Support generally uses reinforced concrete support or steel pipe support.The excavation of foundation pit stage, the most from top to bottom the stage excavation soil body and and
Time set up support.Agent structure returns the stage of building, and pours agent structure plate, wall construction from bottom to top, and successively removes support.Typically
The deep basal pit degree of depth about 10～20 meters, indivedual deep basal pits, more than 30 meters, support and lay vertical spacing about 3～5 meters, and agent structure is returned and built
Impact supported is divided into multistage construction.Agent structure segmentation is returned and is built in construction, and agent structure not yet forms effective beaer
System, from safety, economy point, generally uses support replacement operation, and the operation of support replacement operation is as shown in Figure 1 to Figure 4.
Fig. 1 is the structure chart that Support of Foundation Pit Excavation completes after-pouring tunnel structure base plate, wherein, and the both sides in substrate hole 400
It is provided with building enclosure 100, is provided with concrete between two building enclosures 100 and supports the 300, first supporting steel pipe 601 and the second supporting steel
Pipe 602, the pre-position between two building enclosures 100 is additionally provided with stand column pile 500.In work progress, complete above-mentioned
After structure sets up, first carry out pouring of tunnel floor 200.
Fig. 2 is the structure chart removing the second supporting steel pipe after-pouring tunnel sidewalls.Complete after tunnel floor 200 pours,
Remove the second supporting steel pipe 602 played a supporting role, then carry out pouring of tunnel sidewalls 700.Tunnel floor 200 and tunnel
Construction joint between side wall 700 should ensure that flat smooth.
Fig. 3 is the structure chart installed and remove the first supporting steel pipe after support replacement steel pipe.After tunnel sidewalls 700 pours,
Support replacement steel pipe 900 is installed between two tunnel sidewalls 700, then the first supporting steel pipe 601 is removed.
Fig. 4 is the structure chart having removed support replacement steel pipe after tunnel roof has poured.After installing support replacement steel pipe 900, carry out
Pouring of tunnel roof 800, removes support replacement steel pipe 900 after having poured.
Above-mentioned underground engineering agent structure return build the stage use support replacement maneuver there is problems in that
1) there is interference with main structure construction scaffold in the support replacement steel pipe that support replacement installation exercise uses, and affects agent structure
Returning and build operation, there is resentment, and then brings potential safety hazard in part unit in charge of construction；
2) support replacement steel pipe dismounting operation is implemented after agent structure completes, and not only working space is little, traffic condition is poor, and
Owing to being difficult with big machinery, the labor intensity causing operator is big, construction risk is high.
For these reasons, complete agent structure wall, the angle of plate bearing capacity from making full use of, propose to complete
In agent structure wall, plate, Shi Hanzhang is to substitute the solution of support replacement.
Therefore, it is necessary to propose time building method of a kind of agent structure wall prestressed structure and agent structure wall, it is possible to fill
Divide and utilize the bearing capacity having completed agent structure wall, plate, while ensureing enabling capabilities, substitute support replacement job execution structure
And construction method, thus eliminate safe hidden trouble, reduce difficulty of construction.
Summary of the invention
(1) to solve the technical problem that
It is an object of the present invention to propose a kind of agent structure wall prestressed structure, this prestressed structure can be filled
Point utilizing and to have completed the bearing capacity of agent structure wall, plate, solve that support replacement job execution structure in prior art exists executes
Work difficulty is big, unit in charge of construction exists resentment, support replacement steel pipe is removed and the problem of traffic condition difference.
Further object is that, propose a kind of master that constructing operation difficulty is low, easy to operate, labor intensity is low
Time building method of body structural wall.
(2) technical scheme
In order to achieve the above object, on the one hand, the main technical schemes that the present invention uses includes:
A kind of agent structure wall prestressed structure, including side wall and base plate, also includes pre-being embedded in described side wall and base plate
The sleeve pipe in hollow structure, the first end of described sleeve pipe stretches out described base plate, and the second end of described sleeve pipe stretches out described side wall；
Being equipped with steel strand wires in described sleeve pipe, described steel strand wires can be extracted out from described sleeve pipe；
Being applied with prestressing force on described steel strand wires, the described prestressing force of applying is used for resisting the deformation of described side wall.
Further, the first end of described sleeve pipe and the second end being respectively arranged with anchorage, described anchorage is for applying
Described steel strand wires after prestressing force are fixed.
Preferably, described sleeve pipe curved structure in described side wall and base plate is arranged, and described arcuate structure runs through described
Side wall and base plate；
Described sleeve pipe is away from described side face of wall 6cm ± 1cm；
Radius of curvature R 100cm of described arcuate structure.
Further, the length direction along described side wall is arranged with the described sleeve pipe of predetermined quantity in parallel.
Preferably, described in adjacent two between sleeve pipe at a distance of 1.5m ± 0.1m.
In order to achieve the above object, on the other hand, the main technical schemes that the present invention uses includes:
Time building method of a kind of agent structure wall, comprises the following steps:
Step S10, steel strand wires are penetrated in the sleeve pipe of hollow structure；
Step S20, by described sleeve pipe pre-embedding in pre-position, carry out base plate the most successively and side wall pour；
Step S30, carry out the steel strand wires in described sleeve pipe stretching Shi Hanzhang, Shi Hanzhang complete after by solid
Described steel strand wires are fixed by locking member；
After step S40, one-piece casting complete, remove described steel strand wires and fixture；
Step S50, block described sleeve pipe.
Further, step S20 comprises the steps of
Step S21, before pouring base plate, a part for described sleeve pipe is embedded at described base plate position in advance, and
The first end making described sleeve pipe stretches out described base plate；
Step S22, before pouring side wall, is embedded in the remainder of described sleeve pipe at described side wall position in advance,
And make the second end of described sleeve pipe stretch out described side wall.
Further, in step S30, the concrete strength when pouring described side wall reaches the 70% of design strength
After 80%, carry out described steel strand wires stretching Shi Hanzhang.
Preferably, described fixture is anchorage.
Further, in step S50, cement mortar is used to block described sleeve pipe.
(3) beneficial effect
The invention has the beneficial effects as follows: the agent structure wall prestressed structure in the present invention, be not only simple in structure, Er Qieneng
Enough effectively reduce back the interference building in operation process, greatly reduce the labor operation intensity of workman.
Using agent structure wall prestressed structure to replace steel pipe support replacement operation, during solving steel pipe support replacement, top board does not waters
Before building, because directly removing lateral water that steel pipe support causes, soil pressure cause greatly that foundation pit deformation is excessive, outside side wall tension and break
The problem of bad sidewall structure.
Shi Hanzhang on present invention steel strand wires in sleeve pipe, steel strand wires are to applying counteracted by pressure base outside structure side wall
The part lateral pressure in hole, it is ensured that during pouring top board in the case of not setting up steel pipe support replacement, foundation pit deformation is at safe model
Time building method of the agent structure wall in the present invention is simple, easy to operate, and operating process is compared to existing technology
In the human and material resources used of steel pipe support replacement operation few, greatly reduce construction cost, greatly improve the warp of unit in charge of construction
Ji benefit, is suitable for large-scale promotion and uses.
Accompanying drawing explanation
Fig. 1 is the structure chart that Support of Foundation Pit Excavation completes after-pouring tunnel structure base plate；
Fig. 2 is the structure chart removing the second supporting steel pipe after-pouring tunnel sidewalls；
Fig. 3 is the structure chart installed and remove the first supporting steel pipe after support replacement steel pipe；
Fig. 4 is the structure chart having removed support replacement steel pipe after tunnel roof has poured；
Fig. 5 is the cross section semi-cutaway of agent structure wall prestressed structure；
Fig. 6 is the plan structure figure of agent structure wall prestressed structure；
Fig. 7 is the part-structure figure of agent structure wall prestressed structure.
[description of reference numerals]
100, building enclosure；
200, tunnel floor；
300, concrete supports；
400, at the bottom of foundation ditch；
500, stand column pile；
601, the first supporting steel pipe；
602, the second supporting steel pipe；
700, tunnel sidewalls；
800, tunnel roof；
900, support replacement steel pipe；
1, steel strand wires；
3, sleeve pipe；
4, side wall；
5, base plate.
Detailed description of the invention
In order to preferably explain the present invention, in order to understand, below in conjunction with the accompanying drawings, by detailed description of the invention, to this
Bright it is described in detail.
As shown in Figure 5, Figure 6, it is the agent structure wall prestressed structure of the present embodiment proposition, including side wall 4 and base plate 5.
In order to ensure that whole foundation ditch in top board casting process, especially side wall 4 do not produce moderate finite deformation, pre-buried in side wall 4 and base plate 5
Having the sleeve pipe 3 in hollow structure, be equipped with steel strand wires 1 in sleeve pipe 3, steel strand wires 1 can be extracted out from sleeve pipe 3.
As one preferred embodiment, the cross section of sleeve pipe 3 is cirque structure, but is not limited to annular knot
Structure, can also use in some cases cross section be square hollow structure or other be capable of sleeve pipe 3 effect structure.
Being extracted out from sleeve pipe 3 by steel strand wires 1 for convenience, the first end of sleeve pipe 3 stretches out base plate 5, and the second end of sleeve pipe 3 is stretched
Go out side wall 4.In the present embodiment, steel strand wires 1 being used multiple-anticorrosion measure, be coated with anti-corrosive grease outside steel strand wires 1, single bag gathers
After ethylene, whole Shu Zaiyong polyethylene tube wraps up." steel strand wires for prestressed concrete " are met when steel strand wires 1 are chosen
(GB/T5224) standard, and according to the Structure Calculation steel strand wires 1 required prestress value provided, steel strand wires 1 are carried out type selecting.?
It is noted that problems with during calculated prestressing force, building the stage returning, the prestressing force of steel strand wires 1 participates in foundation pit supporting construction and calculates and base
Hole Stability Checking process, the pre-stress design value of steel strand wires 1 it is ensured that in the case of construction period is not provided with support replacement, body junction
Structure deformation of wall value is in safety range.
In order to solve before top board during steel pipe support replacement of the prior art do not pours, cause because directly removing steel pipe support
Lateral water, soil pressure cause greatly that foundation pit deformation is excessive, tension and the problem of destroying sidewall structure outside side wall.Need in this reality
Executing Shi Hanzhang on the steel strand wires 1 in example, the prestressing force of applying is for resisting the deformation of side wall 4 and foundation ditch.
In order to ensure to keep steel strand wires 1 not move after to steel strand wires 1 Shi Hanzhang, the first end of sleeve pipe 3 and second
Being respectively arranged with anchorage 2 on end, anchorage 2 is for being fixed the steel strand wires 1 after Shi Hanzhang.In the present embodiment, anchor
Using clip type structure when tool 2 is fixed, it is preferred that the code name of anchorage 2 is YJM, the code name that fixture is selected is YJJ, the company of use
The code name connecing device is YJL.Anchorage 2 fixed system in the present embodiment is mainly protected by nut, anchor ingot set, internal and external casing and pyrocondensation
The parts compositions such as set.Anchor ingot overlaps and is connected reliably between steel strand wires 1, and safety is high, and steel strand wires 1 boundling penetrates anchor ingot set, can root
According to stress needing adjust extruding force and compress length, plastic deformation after making anchor ingot set be squeezed and produce to steel strand wires 1
Bond stress ensure that un-slipped.Meanwhile, the hardness ratio steel strand wires 1 of anchor ingot set are low, damage steel strand wires 1 not quite, can reach
Higher efficiency of anchorage.Additionally, no matter steel strand wires 1 stress how, anchor ingot set is all constant, at steel to its bond stress
Twisted wire 1 stress is all without getting loose in the case of negative stress.Owing to being provided with pyrocondensation protection set, pyrocondensation protection set wraps in anchor ingot set
Periphery, plays sealing and protects externally threaded effect in transportation.And have spacer between steel strand wires 1 in anchor ingot set, can
According to different tonnages, use the most steel strand wires.Said structure is a kind of mode selected in the present embodiment, but makes
Above-mentioned a kind of mode it is not limited to, as long as being capable of the fixing of steel strand wires 1 during with.
As one preferred embodiment, sleeve pipe 3 curved structure in side wall 4 and base plate 5 is arranged, and arcuate structure passes through
Wear side wall 4 and base plate 5.The arcuate structure that sleeve pipe 3 is bent to form should on the premise of ensureing structural concrete protective layer thickness to the greatest extent
The outside of possible close agent structure side wall.The sleeve pipe 3 outer surface 6cm ± 1cm away from side wall 4, the corner of arcuate structure is kept away
Exempting to use right-angle structure, right-angle structure easily causes the damage of sleeve pipe 3 and causes overall structure to use.Preferably, sleeve pipe 3
Radius of curvature R 100cm of arcuate structure, but the bending radius of arcuate structure is also unsuitable excessive, can enter based on experience value
Row determines, it is possible to ensure that sleeve pipe 3 plays a role.
As it is shown in fig. 7, be the sleeve pipe 3 distance apart from the left outside sidewall of side wall 4 at a of position, distance herein be 6cm ±
1cm；Being the sleeve pipe 3 distance apart from side wall 4 bottom outer wall at the b of position, distance herein is also 6cm ± 1cm；For set at the c of position
The arcuate structure of pipe 3, radian herein is R 100cm.
In order to ensure whole side wall 4 and the stability of foundation ditch, the length direction along side wall 4 is arranged with predetermined quantity in parallel
Sleeve pipe 3.This predetermined quantity is that the length difference according to side wall 4 is determined.One preferably, is overlapped according to adjacent two
Between pipe 3, the quantity of sleeve pipe 3 is configured, preferably between each adjacent two sleeve pipes 3 apart by the mode at a distance of 1.5m ± 0.1m
Agent structure wall prestressed structure in the present embodiment, is not only simple in structure, and can effectively reduce Hui Zhuzuo
Interference during industry, greatly reduces the labor operation intensity of workman.
The present embodiment is applied outside structure side wall 4 by Shi Hanzhang on the steel strand wires 1 in sleeve pipe 3, steel strand wires 1
The part lateral pressure of counteracted by pressure foundation ditch, it is ensured that during pouring top board in the case of not setting up steel pipe support replacement, foundation ditch becomes
Shape is in safety range.
Present embodiment discloses the building method that returns of a kind of agent structure wall, this time building method is the knot in using embodiment one
Structure carries out back building.
Agent structure wall in the present embodiment returns building method, comprises the following steps:
Step S10, steel strand wires are penetrated in the sleeve pipe of hollow structure.Require that steel strand wires can be at sleeve pipe in this step
Middle being twitched, sleeve pipe can not be to the tension of steel strand wires parcel.
Step S20, by sleeve pipe pre-embedding in pre-position, carry out base plate the most successively and side wall pour.This step has again
Body comprises following two step:
Step S21, before pouring base plate, a part for sleeve pipe is embedded at base plate position in advance, and makes sleeve pipe
First end stretches out base plate.
Step S22, before pouring side wall, is embedded in the remainder of sleeve pipe in advance at side wall position, and makes sleeve pipe
The second end stretch out side wall.
Step S30, the steel strand wires in sleeve pipe are carried out stretch Shi Hanzhang, Shi Hanzhang passes through fixture after completing
Steel strand wires are fixed.In this step, the process of Shi Hanzhang needs the concrete strength when pouring side wall to reach
After 70% the 80% of design strength, preferably 75%, carry out steel strand wires stretching Shi Hanzhang.Preferably, in this step
The fixture used is anchorage.
After step S40, one-piece casting complete, remove steel strand wires and fixture；
Step S50, closure sleeve pipe, it is preferred to use sleeve pipe is blocked by cement mortar.
Time building method of the agent structure wall in the present embodiment is simple, easy to operate, compares existing in operating process
The human and material resources that steel pipe support replacement operation in technology is used are few, greatly reduce construction cost, greatly improve unit in charge of construction
Economic benefit, be suitable for large-scale promotion use.
Above content is only presently preferred embodiments of the present invention, for those of ordinary skill in the art, according to the present invention's
Thought, the most all will change, and this specification content should not be construed as the present invention