CN109654295A - The interim thrust block of elbow access point and its construction method and design method - Google Patents
The interim thrust block of elbow access point and its construction method and design method Download PDFInfo
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- CN109654295A CN109654295A CN201811604611.1A CN201811604611A CN109654295A CN 109654295 A CN109654295 A CN 109654295A CN 201811604611 A CN201811604611 A CN 201811604611A CN 109654295 A CN109654295 A CN 109654295A
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- Prior art keywords
- fashioned iron
- elbow
- access point
- pipeline
- connection
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
- F16L1/028—Laying or reclaiming pipes on land, e.g. above the ground in the ground
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/46—Foundations for supply conduits or other canals
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
- F16L1/06—Accessories therefor, e.g. anchors
- F16L1/09—Accessories therefor, e.g. anchors for bringing two tubular members closer to each other
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Pipeline Systems (AREA)
Abstract
The present invention provides a kind of interim thrust block of elbow access point and its construction methods and design method, including pedestal, the upper surface of pedestal is vertically embedded with first fashioned iron and two second fashioned iron, wherein the first fashioned iron is located at the inside of elbow access point pipeline, two second fashioned iron are symmetrically arranged on the outside of elbow access point pipeline, piece first fashioned iron and two second fashioned iron are in angular distribution, and elbow access point pipeline is located between three fashioned iron；The first connection fashioned iron is wherein respectively welded between the top of the first fashioned iron and the top of two second fashioned iron, the second connection fashioned iron parallel with pedestal upper surface is provided between two second fashioned iron, first connection fashioned iron is located at the top of elbow access point pipeline, and the second connection fashioned iron is located at outside in the middle part of elbow access point pipeline.The present invention guarantees pipeline early period stability under loading, and is able to maintain the overall stability that subsequent anchor block pours, simultaneously as interim thrust structure of constructing in advance, saves water-cut-off and space.
Description
Technical field
Change the technical field for moving construction the present invention relates to pipeline, and in particular to a kind of interim thrust block of elbow access point and its
Construction method and design method.
Background technique
Qatar, high speed connection Doha International airport, east and industrial area, by the Chinese bay assembly under middle intersection League flag
It wraps, what engineering and middle intersection were rolled into a ball along category the Belt and Road pays close attention to project.Qatar where this project ground is located at Persian Gulf west
Bank belongs to typical Middle East tropical desert climate, and within the border without natural fresh water, domestic water all relies on Seawater Desalination Project to provide,
The whole nation is conveyed by pressure pipe network.The project needs about 32 kilometers of municipal tap water pipelines of reorganization and expansion, for socket joint type pressure pipe
The bend part in road need to configure the thrust block (also known as anchor block) of enough weight according to pressure and pipe diameter size.Aqueduct it is new
It builds, relocate, expanding line work, having pipeline flow big, it is more to influence user, and the window phase of constructing of cutting off the water is short, excavates cutting preparation
Complexity, Manage Large-scale Equipment require the features such as high, it is necessary to assure primary success.The engineering for changing broken line especially for straight line, connects
After pipeline water flowing pressurization big displacement cannot occur for access point thrust block, and spigot-and-socket joint is not distorted and deviates from (displacement
Less than lcm), thrust structure must be safe and reliable.To the major diameter pressure pipeline of 1200 legs or more, access thrust scheme is set
Meter and technique are the heavy difficult points of such engineering construction.Foreign countries are most for the design document and construction Guide Book of such works
It is designed for basic technology, it is domestic to design and construct at present to the thrust block of long range usual pressure waterline, to complex condition
Access relocate thrust scheme research it is relatively fewer.
Summary of the invention
The purpose of the present invention is to the defect of the prior art, a kind of interim thrust block of elbow access point is provided and its is applied
Work method and design method, guarantee pipeline early period stability under loading, and it is able to maintain the overall stability that subsequent anchor block pours, simultaneously
Because constructing interim thrust structure in advance, water-cut-off and space are saved.
The present invention provides a kind of to change the interim thrust block of elbow access point for moving engineering for pressure pipeline, and feature exists
In: it includes the embedded pedestal below the elbow access point, the upper surface of pedestal be vertically embedded with first fashioned iron and
Two second fashioned iron, wherein the first fashioned iron is located at the inside of elbow access point pipeline, two second fashioned iron be symmetrically arranged in
On the outside of elbow access point pipeline, first fashioned iron and two second fashioned iron are in angular distribution, elbow access point pipeline position
Between Yu Sangen fashioned iron；The first connecting-type is wherein respectively welded between the top of the first fashioned iron and the top of two second fashioned iron
Steel, the second connection fashioned iron parallel with pedestal upper surface is provided between two second fashioned iron, and the first connection fashioned iron is located at curved
The top of head access point pipeline, the second connection fashioned iron are located at outside in the middle part of elbow access point pipeline；Further include third fashioned iron and tiltedly
Fashioned iron is supportted, third fashioned iron is vertically embedded in pedestal upper surface in advance, and third fashioned iron is located at the first fashioned iron and two second fashioned iron formation
On the outside of three-legged structure；Diagonal brace fashioned iron is connected to third fashioned iron close between the end of pedestal upper surface and the second connection fashioned iron.
In above-mentioned technical proposal, the first fashioned iron is located at the center point of elbow access point.
In above-mentioned technical proposal, third fashioned iron is located on the angular bisector of elbow access point.
In above-mentioned technical proposal, the web of the second fashioned iron is overlapped with the circle center line connecting of elbow access point.
In above-mentioned technical proposal, horse is provided between two the second fashioned iron and the second connection fashioned iron and elbow tube body access point
The arc surface of saddle bearer, the saddle support is matched with elbow access point pipeline outer wall.
In above-mentioned technical proposal, the second fashioned iron is parallel with the tangent line at elbow access point pipeline inflection point.
In above-mentioned technical proposal, in setting between the pedestal upper surface on the outside of two second fashioned iron and elbow access point pipeline
There is diagonal brace, described diagonal brace one end is welded on vertical corresponding second fashioned iron, and the other end is welded on outer base table in concrete
On the pre-buried short steel in face, with the second fashioned iron of Auxiliary support.
The present invention provides a kind of to change the design method for moving the interim thrust block of elbow access point of engineering for pressure pipeline,
Characterized by the following steps:
The first step makees elbow access point plan-position figure, determines the position dimension relationship of connecting bend and existing pipeline；
Second step judges the center location O of elbow, determines that above-mentioned center location is the installation site H0 of the first fashioned iron；
Third step makees the angular bisector of elbow, determines angular bisector of the installation site H1 of third fashioned iron on the outside of elbow
On；
4th step determines the position of first second fashioned iron H2, guarantees that the second fashioned iron abuts existing pipeline, and make web side
To tangent with proposed elbow tube wall, so that H2 and circle center line connecting and OH1 angle are minimum, conducive to the transmitting of elbow pressure；
5th step does the mirror image of OH2 using angular bisector as baseline, determines the installation initial position of second second fashioned iron
H3, when H3 conflicts with existing pipeline, then along the direction OH3 appropriate adjustment until wing plate and existing tube contacts；
6th step, according to by load simplified mathematical model, checking stress and amount of deflection among cantilever beam and determine fashioned iron
Specification finely tunes the position of H2 and H3, guarantees that it keeps 5-10cm with newly-built pipeline, saddle is reserved between fashioned iron and elbow
The welding space of support；
7th step, it is ensured that concrete pedestal size and location guarantee that protective layer is greater than 15cm on the outside of fashioned iron；
8th step, calculate second connection fashioned iron size and specification, first connection fashioned iron be respectively arranged at the first fashioned iron with
Between at the top of two the second fashioned iron, between the length of the first connection fashioned iron is not less than between the first fashioned iron and the top of the second fashioned iron
Away from；Second connection fashioned iron is set between two the second fashioned iron, determines the tangent position of elbow inflection point as the second connection fashioned iron
Installation site, second connection fashioned iron and elbow between reserve saddle support welding space；
9th step, determines the size and specification and installation site of diagonal brace fashioned iron, and diagonal brace fashioned iron is located in the second connection fashioned iron
Point and third fashioned iron expose between the bottom end of base part.
In above-mentioned technical proposal, the first fashioned iron, the second fashioned iron, third fashioned iron setting angle be each perpendicular to elbow pipeline institute
In plane, each fashioned iron is embedded in the concrete pedestal of bottom design, and pedestal is integrally mounted in the non-disturbance of existing pipeline lower part
In Rock And Soil, drag support system is formed.
In above-mentioned technical proposal, the setting angle of the second connection fashioned iron is each parallel to plane where elbow pipeline.
In above-mentioned technical proposal, the first fashioned iron, the second fashioned iron, third fashioned iron web be parallel to pressure direction arrangement, root
According to the water pressure calculation fashioned iron specification of elbow access point, every fashioned iron can bear the total load and satisfaction of the water pressure of half
Bending strength requires and amount of deflection limits value 1cm at saddle support.
In above-mentioned technical proposal, the depth of foundation pit is equal to pipe diameter D+0.3m and also needs to meet anti-when for earthen foundation
Checking computations of toppling require.
In above-mentioned technical proposal, the pre-buried depth of fashioned iron is not less than pipe diameter.
In above-mentioned technical proposal, according to the height of elbow and the first fashioned iron of water pressure calculation of elbow access point, second type
The height of steel, wherein pre-buried depth is not less than pipe diameter, exposed parts are not less than pipe diameter+0.3m.
In above-mentioned technical proposal, the angle or third fashioned iron and first of diagonal brace are determined according to the water pressure of elbow access point
Spacing between fashioned iron, so that the sharp angle of plane is less than 45 ° where diagonal brace and elbow pipeline.
In above-mentioned technical proposal, the radius of curvature of the arc surface of saddle support is determined according to corner dimension, guarantees saddle branch
The outer wall of seat and elbow is effectively bonded.
The present invention provides a kind of to change the construction method for moving the elbow access point thrust block of engineering for pressure pipeline, including
Following steps:
The first step excavates foundation pit below elbow access point pipeline, clears up after-pouring concrete cushion；
Second step, the arrangement of reinforcement banding steel cage in foundation pit, and in the inner side and outer side location and installation H-type of elbow access point
Steel；
Third step, casting concrete forms pedestal and conserves in foundation pit；
4th step applies for water-cut-off, normally cuts pipeline, assembles elbow and washer
5th step welds the second connection fashioned iron between adjacent H profile steel, and the diagonal brace on the outside of the second connection fashioned iron makes curved
Road access point pipeline is located in H profile steel, the second connection fashioned iron and the steel door frame that cooperatively forms of diagonal brace, welds tube wall backing plate and wedge
Son consolidates elbow；
6th step, connecting bend and pipeline, after checking that pipeline has water flowing condition, valve opening water flowing, monitoring H profile steel structure becomes
Shape situation, it is ensured that stability；
7th step continues to bind the fast reinforcing bar of permanent thrust, die-filling on the outside of elbow, completes permanent thrust block by design and pour
Construction.
In above-mentioned technical proposal, the H profile steel includes first fashioned iron and two second fashioned iron, wherein the first fashioned iron position
In the inside of elbow access point pipeline, two second fashioned iron are symmetrically arranged on the outside of elbow access point pipeline, and described one
First fashioned iron and two second fashioned iron are in angular distribution, and elbow access point pipeline is located between three fashioned iron.
In above-mentioned technical proposal, the second connecting-type ladle includes two first connection fashioned iron, two first connection fashioned iron
Be welded between the top of the first fashioned iron and the top of two second fashioned iron, be provided between two second fashioned iron on pedestal
The second parallel connection fashioned iron of surface, the first connection fashioned iron are located at the top of elbow access point pipeline, and the second connection fashioned iron is located at
Outside in the middle part of elbow access point pipeline.
In above-mentioned technical proposal, the H profile steel further includes third fashioned iron, and third fashioned iron is located at the first fashioned iron and two second
On the outside of the three-legged structure that fashioned iron is formed；Diagonal brace is connected to third fashioned iron close to the end of pedestal upper surface and the second connection fashioned iron
Between.
In above-mentioned technical proposal, in the first step, excavation of foundation pit combination geological condition, using digging machine, rock drilling big gun head or gear wheel
Head fluting, foundation pit width are greater than pipe diameter 0.6m.
In above-mentioned technical proposal, in second step, pedestal need to relocate install before pour at least 7 days, pedestal use C20 and with
Upper label concreting, reinforcing bar select diameter 12mm 150mm commonly banding steel cage with ribbing；Protective layer thickness is greater than 5cm, H
Fashioned iron column is greater than 10cm away from concrete outer edge.
In above-mentioned technical proposal, in the 5th step, it is inserted between the first fashioned iron and two second fashioned iron and the gap of elbow
Saddle simultaneously welds；Saddle is protected with pipe surface contact site pad 0.5cm rubber skin.
In above-mentioned technical proposal, in the 6th step, all flange bolts of the junction of elbow and pipeline after the installation is completed, clearly
Place is managed, spring displacement meter is installed in elbow bell and spigot top side location, spring displacement meter is adsorbed on straight pipeline surface, displacement is visited
Needle is contacted on elbow socket ring, and adjustment position makes its stabilization, and connects data collector for monitoring H profile steel malformation feelings
Condition.
In above-mentioned technical proposal, the first fashioned iron is located at the center point of elbow access point；Third fashioned iron is located at elbow access point
Angular bisector on.
In above-mentioned technical proposal, the web of the second fashioned iron is overlapped with the circle center line connecting of elbow access point；Two first connections
Angle between fashioned iron is less than 90 degree.
The present invention solves under the common complicated underground utilities constraint of municipal project, without enough working spaces and applies
Work window phase, and there is quality risk in existing traditional design construction method.By proposing that a kind of cast-in-situ concrete is pre-
Fashioned iron thrust structure method is buried, is formed at major diameter spheroidal graphite cast-iron pressure pipeline elbow and quickly accesses the technique of thrust, and repeatedly existed
Municipal tap water core network is cut off the water supply to move to change in work and is applied successfully.Pre-buried shape steel bracket, profile steel frame when by pouring pedestal
Construction period with pedestal without cutting off the water supply, only needs to cut off the water, be made by fashioned iron during the old Pipe installing elbow of cutting changes and moves
For interim thrust brake, water flowing can be runed in the construction time of permanent thrust block.Steel construction stress and security analysis of structure
Method can concisely quantify, and report Project Surveillance engineer to be given an written reply conducive to contractor.It is spelled compared to traditional precast concrete block
Technique or early strength concrete cast in place process are filled, all tool has great advantage in safety, economy and convenience for construction, avoids
The hoisting operation that risk is high, time-consuming.The present invention, which has greatly saved to cut off the water supply, is connected to the idle time to resume water supply and safety
Quality risk reduces the influence cut off the water to user, becomes project where inventor and cuts off the water supply the pushing away of construction similar to complex condition
Recommend engineering method.
Detailed description of the invention
Fig. 1 is for structural schematic diagram of the invention；
Fig. 2-7 is for design cycle schematic diagram of the invention；
Fig. 8 is for the schematic diagram after the completion of present invention construction；
Fig. 9 is that Construction State monitoring diagram of the present invention is intended to；
Figure 10 is monitoring device scheme of installation；
Figure 11 is the structural schematic diagram of saddle support；
Figure 12 is the operating condition schematic diagram in specific embodiment 2.
Wherein, 1- elbow, the first fashioned iron of 21-, the second fashioned iron of 22-, 23- third fashioned iron, 3- saddle support, 4- foundation pit, 5-
First connection fashioned iron, the connection fashioned iron of 6- second, 7- diagonal brace fashioned iron, the permanent thrust block of 8-, the new pipeline of 9-, 10- groove, the old pipe of 11-
Road, 12- spring displacement meter, 12.1- magnet base, 12.2- lock, 12.3- telescopic displacement needle, 12.4- data collector, 13-
Elbow socket ring.
Specific embodiment
The following further describes the present invention in detail with reference to the accompanying drawings and specific embodiments, convenient for this hair is well understood
It is bright, but they limiting the invention.
As shown in Figure 1, it includes being located at 1 access point of elbow the present invention provides a kind of interim thrust block of elbow access point
The pedestal of lower section, the upper surface of pedestal is vertically embedded with first fashioned iron 21 and two second fashioned iron 22, wherein the first fashioned iron
21 are located at the inside of 1 access point pipeline of elbow, and two second fashioned iron 22 are symmetrically arranged on the outside of 1 access point pipeline of elbow,
Piece first fashioned iron 21 and two second fashioned iron 22 are in angular distribution, and 1 access point pipeline of elbow is located between three fashioned iron；
Wherein it is respectively welded the first connection fashioned iron 5 between the top of the first fashioned iron 21 and the top of two second fashioned iron 22, two
The first connection fashioned iron 6 parallel with pedestal upper surface is provided between two fashioned iron 22, the first connection fashioned iron 5 is located at elbow 1 and connects
The top of access point pipeline, the first connection fashioned iron 6 are located at outside in the middle part of 1 access point pipeline of elbow；Further include third fashioned iron 23 and tiltedly
Fashioned iron 7 is supportted, third fashioned iron 23 is vertically embedded in pedestal upper surface in advance, and third fashioned iron 23 is located at the first fashioned iron 21 and two second fashioned iron
On the outside of 22 three-legged structures formed；Diagonal brace fashioned iron 7 is connected to third fashioned iron 23 and connects close to the end of pedestal upper surface and first
Between direct type steel 6.First fashioned iron 21, the second fashioned iron 22 and the first connection fashioned iron 5 form the steel door frame structure of triangle, are elbow
1 provides effective support force；First connection fashioned iron 6 is turned by third fashioned iron 23 and diagonal brace fashioned iron 7 in elbow 1 in 1 inflection point of elbow
Effective support is provided at point.The steel construction is that elbow 1 provides interim thrust.
First fashioned iron 21 is located at the center point of 1 access point of elbow, plays the stress of two second fashioned iron of balance and tribute
Offer bending stiffness.
The third fashioned iron 23 is located on the angular bisector of 1 access point of elbow, the thrust side generated after by hydraulic pressure with elbow
To coincidence.
The web of second fashioned iron 22 is overlapped with the circle center line connecting of 1 access point of elbow, makes fashioned iron bending resistance in thrust
Component direction obtain maximum performance.
Angle between described two first connection fashioned iron 5 is less than 90 degree.
Saddle support is provided between described two second fashioned iron 22 and the first connection fashioned iron 6 and 1 tube body access point of elbow
3, the arc surface of the saddle support 3 is matched with 1 access point pipeline outer wall of elbow, guarantees the uniform force of 1 outer wall of elbow.Casting
Iron pipe is insufficient relative to steel pipe ductility, be easy to cause local failure, therefore needs to connect in fashioned iron and pipeline when Construction of Steel Structure
Carry out the protection of shape of a saddle bed course, dispersing contact point stress in contact.
First connection fashioned iron 6 is parallel with the tangent line at access point pipeline inflection point, so that elbow generates under the action of water pressure
Thrust and fashioned iron 6 be located at approximately the same plane, do not generate deflecting force.
In being provided with diagonal brace between pedestal upper surface on the outside of the first connection fashioned iron 6 and 1 access point pipeline of elbow.Institute
It states diagonal brace and further strengthens entire steel structure bending resistance.
Comprehensively consider water stopping time cost and material installation cost, the factors such as working security, it is recommended to use pre-buried steel structure
After-pouring scheme.Firstly, being checked by measurement, it is ensured that pre-buried fashioned iron can avoid cut point before cutting off the water supply, and energy is quasi- after installing elbow 1
Determine that tube body is lockked in position.Normal construction Pipe Cutting, connection, fixation and steelframe welding, carry out permanent after the completion of all access work
Block one-piece casting.This scheme can either guarantee pipeline stability under loading early period, and subsequent anchor block pours between being able to maintain trial run period
The overall stability built, simultaneously as interim thrust structure of constructing in advance, saves water-cut-off and space；H profile steel is light-weight,
Hanging device is simple, easy to operate, does not influence subsequent existing pipeline and removes work.
A kind of construction method of the elbow access point thrust block, comprising the following steps:
The first step excavates foundation pit 4 below 1 access point pipeline of elbow, foundation depth meets the building-in depth of support fashioned iron,
Length and width meet the requirement of protective layer thickness on the outside of fashioned iron, clear up after-pouring concrete cushion；Foundation pit 4, which excavates, combines geological condition,
Using digging machine, rock drilling big gun head or gear wheel head fluting, 4 width of foundation pit are greater than pipe diameter 0.6m.
Second step, the arrangement of reinforcement banding steel cage in foundation pit 4, and in the inner side and outer side location and installation H-type of 1 access point of elbow
Steel；Reinforcing bar selects diameter 12mm 150mm commonly banding steel cage with ribbing；Protective layer thickness is greater than 5cm, and H profile steel column is away from mixed finger
4 outside edge edge of foundation pit is greater than 10cm.
Third step, casting concrete forms pedestal and conserves in foundation pit 4；Pedestal need to relocate install before pour at least 7 days
It builds, pedestal is poured using C20 and the above concrete,
4th step, application pipeline move the water-cut-off changed, normally cut pipeline, assemble elbow 1 and washer；
5th step, connecting bend and pipeline weld the second connection fashioned iron, in the second connecting-type between adjacent H profile steel
Diagonal brace on the outside of steel is located at bend access point pipeline in H profile steel, the second connection fashioned iron and the steel door frame that cooperatively forms of diagonal brace, weldering
Adapter tube wall backing plate and chock consolidate elbow 1；It is inserted between the first fashioned iron 21 and two second fashioned iron 22 and the gap of elbow 1
Saddle simultaneously welds；Saddle is protected with pipe surface contact site pad 0.5cm rubber skin.
6th step, connecting bend 1 and pipeline, after checking that pipeline has water flowing condition, valve opening water flowing monitors H profile steel structure
Deformation, it is ensured that stability；All flange bolts of the junction of elbow 1 and pipeline after the installation is completed, place cleaning, curved
First 1 bell and spigot top side location installs spring displacement meter 12, and spring displacement meter 12 is adsorbed on to the rectilinear tubes of new pipeline and old pipeline
Pipe surface, displacement probe are contacted with 13 on elbow socket ring, and adjustment position makes its stabilization, and connect data collector for supervising
Survey the abjection of elbow socket and structural deformation conditions during trial operation.Diversion project of entirely cutting off the water supply is logical from cutting installation to having valve opening
The water time, spring displacement meter 12 detected that H profile steel structure does not occur obviously to deform less than 8 hours, fully met technique requirement.
7th step continues to bind the fast reinforcing bar of permanent thrust, die-filling on the outside of elbow 1, completes permanent thrust block 8 by design and pour
Construction is built, interim fashioned iron is poured and is wrapped in permanent thrust block without removing.
In above-mentioned technical proposal, interim thrust block is located at the lower section of existing pipeline, is embedded in using cast-in-place method non-turbulent
In Rock And Soil, fulfiled ahead of schedule in the state of conduit running for moving the interim thrust structure changed.Interim thrust block is by insertion rock
The concrete bodies of soil body ground and the H profile steel being embedded in concrete form, and the H profile steel includes first fashioned iron 21 and two
The second fashioned iron of root 22, wherein the first fashioned iron 21 is located at the inside of 1 access point pipeline of elbow, two second fashioned iron 22 are respectively symmetrically set
It is placed on the outside of 1 access point pipeline of elbow, first fashioned iron 21 and two second fashioned iron 22 are in angular distribution, and elbow 1 connects
Access point pipeline is located between three fashioned iron.
A kind of design method of the interim thrust block of elbow access point, it is characterised in that the following steps are included:
The first step makees 1 access point plan-position figure of elbow, determines the position dimension relationship of connecting bend 1 and existing pipeline；
Second step judges the center location O of elbow 1, determines that above-mentioned center location is the installation site H0 of the first fashioned iron 21；
Third step makees the angular bisector of elbow 1, determines that the installation site H1 of third fashioned iron 23 is flat at the angle in 1 outside of elbow
On separated time；
4th step determines the position of first second fashioned iron H2, guarantees that the second fashioned iron abuts existing pipeline, and make web side
To tangent with proposed elbow tube wall, so that H2 and circle center line connecting and OH1 angle are minimum, conducive to the transmitting of elbow pressure；
5th step does the mirror image of OH2 using angular bisector as baseline, determines the installation initial position of second second fashioned iron
H3, when H3 conflicts with existing pipeline, then along the direction OH3 appropriate adjustment until wing plate and existing tube contacts；
6th step, according to by load simplified mathematical model, checking stress and amount of deflection among cantilever beam and determine fashioned iron
Specification finely tunes the position of H2 and H3, guarantees that it keeps 5-10cm with newly-built pipeline, horse is reserved between fashioned iron and elbow 1
The welding space of saddle bearer 3；
7th step, calculates the size and specification of the second connection fashioned iron, and the first connection fashioned iron is respectively arranged at the first fashioned iron 21
Between the top of two the second fashioned iron 22, the length of the first connection fashioned iron is not less than the top of the first fashioned iron 21 and the second fashioned iron 22
Spacing between portion；Second connection fashioned iron is set between third fashioned iron 23 and the 4th fashioned iron, determines the Tangented position of 1 inflection point of elbow
The installation site as the second connection fashioned iron is set, the welding that saddle support 3 is reserved between the second connection fashioned iron and elbow 1 is empty
Between；
8th step, determines the size and specification and installation site of diagonal brace, and diagonal brace is located at the second connection fashioned iron emphasis i.e. second
Fashioned iron 22 exposes between the bottom end of base part；
7th step, it is ensured that concrete pedestal size and location guarantee that protective layer is greater than 15cm on the outside of fashioned iron.
In above-mentioned technical proposal, the first fashioned iron 21, the second fashioned iron 22, third fashioned iron 23 setting angle be each perpendicular to elbow
Plane where 1 pipeline.Each fashioned iron is embedded in the concrete pedestal of bottom design, and pedestal is integrally mounted in existing pipeline lower part
In non-disturbance Rock And Soil, drag support system is formed.
In above-mentioned technical proposal, the setting angle of the second connection fashioned iron is each parallel to plane where 1 pipeline of elbow.
In above-mentioned technical proposal, the first fashioned iron 21, the second fashioned iron 22, third fashioned iron 23 web be parallel to pressure direction cloth
It sets, according to the water pressure calculation fashioned iron specification of 1 access point of elbow, every fashioned iron can bear the total negative of the water pressure of half
Lotus, and meet bending strength and require and amount of deflection limits value 1cm at saddle support.
In above-mentioned technical proposal, pipe diameter D+ is equal to according to the depth of the water pressure calculation foundation pit 4 of 1 access point of elbow
0.3m also needs to meet antidumping checking computations and requires when for earthen foundation.
In above-mentioned technical proposal, the pre-buried depth of fashioned iron is not less than pipe diameter.
In above-mentioned technical proposal, according to the first fashioned iron of water pressure calculation 21 of 1 access point of the height of elbow 1 and elbow,
The height of two fashioned iron 22, wherein pre-buried depth is not less than pipe diameter, exposed parts are not less than pipe diameter+0.3m.
In above-mentioned technical proposal, the angle or third fashioned iron and first of diagonal brace are determined according to the water pressure of elbow access point
Spacing between fashioned iron, so that the sharp angle of plane is less than 45 ° where diagonal brace and elbow pipeline
In above-mentioned technical proposal, the radius of curvature of the arc surface of saddle support 3 is determined according to 1 size of elbow, guarantees saddle
The outer wall of support 3 and elbow 1 is effectively bonded.
In specific embodiment, according to 10 bedrock surface boundary of live 10 hydraulic character of groove and groove, it is complete that design pours pedestal
Full insertion is backbreak in groove 10, height 1.8m, cubic amount of concrete 40m3.Design mode steel strut totally three, deployment scenarios such as Fig. 3.
Equilateral triangle is presented in three fashioned iron buttresses, and one middle separated time and pipeline are at 45 °, and cutting when both guaranteeing not influence to cut off the water connects
It connects, and makes the resultant force of fashioned iron drag in principal pressure direction.Finally by beam is welded to connect at the top of fashioned iron, integrated support is formed.
Fashioned iron selects HW400X400xl3x21mmQ235H fashioned iron, vertical web direction interface the moment of inertia I=66900cm.
Diagonal brace is welded as the additional safety guarantee during installation, is not counted in forcing checking.Due to the cast-in-place insertion of entire concrete pedestal
Country rock, parados are directly bonded with rock mass, can not be made resistant slide and antidumping checking computations herein, only be done flexural member checking computations.
Thrust structure calculates basic parameter table and see the table below:
1 thrust of elbow is pressurized by section and calculates with joint efforts:
In conjunction with fashioned iron parameter list, according to Concentrated load Analysis of A Cantilever Beam Under calculation formula, bending strength school is carried out to H profile steel
Core, is easy to get H profile steel column maximum stress in bend and contact point maximum defluxion is respectively as follows:
σmax=134.03MPa is less than allowable stress 210MPa=3.9mm,
ωc=3.9mm meets displacement and is less than 2cm requirement.
In specific embodiment 2, it is contemplated that pedestal is that cast-in-place concrete is embedded in 10 bottom of groove, is constrained by surrounding Rock And Soil,
Integral slipping is not considered and is toppled.According to the Izod strength and Bit andits control by Concentrated load.
Typical examples take cantilever height H=1400mm, pipe radius R=600mm, fashioned iron spacing B=1600mm.
Point of force application is concentrated to be located in the middle part of fashioned iron cantilever segment, away from concrete seven 00mm.
H profile steel material selection standard see the table below:
H profile steel cross section geometric property standard see the table below:
The thrust calculated result of pipeline intervention elbow 1 see the table below:
| Pipeline pressure ρ | 600kPa |
| Pipe diameter R | 1.2m |
| Pi II | 3.14159 |
| Area A | 1.131m^2 |
| Pipeline pressure P=ρ * A | 678.583kN |
| Gyration α | 90/1.571Deg/Rad |
| Elbow pressure F=P*2sin (α/2) | 960kN |
| Principal mode steel number n | 2Nos |
| Fashioned iron contact pressure F '=F/n | 480kN |
| Jib-length h ' | 0.7m |
Since three root post fashioned iron are lapped one another by contacting girder steel, the statically indeterminate structure for forming common stress is resisted jointly
Pressure distortion.Shape steel web be parallel to pressure direction arrangement, for convenient for calculate by total water pressure press Principle of Average Allocation, every
The fashioned iron of 1 behind of elbow resists 1/2 total load head, and in fashioned iron column small deformation, this hypothesis can meet engineering design
Precision need.
Maximum stress in bend 155MPa is less than design strength 215MPa, calculates safety coefficient Fs=215/100 > 2, elbow
Third root post on the inside of 1 minor radius and the diagonal brace of design further improve the bending resistance of structure.Largest deflection is about
1mm, much smaller than bell and spigot joint Admissible displacement 10mm requirement.
Similarly, it can be calculated and meet the steel construction selection situation of safety requirements and be as follows:
The content that this specification is not described in detail belongs to the prior art well known to professional and technical personnel in the field.
Claims (10)
1. a kind of interim thrust block of elbow access point, it is characterised in that: it includes the embedded base below elbow access point
Seat, the upper surface of pedestal are vertically embedded with first fashioned iron and two second fashioned iron, wherein the first fashioned iron is located at elbow access
The inside of point pipeline, two second fashioned iron are symmetrically arranged on the outside of elbow access point pipeline, first fashioned iron and
Two second fashioned iron are in angular distribution, and elbow access point pipeline is located between three fashioned iron；The wherein top of the first fashioned iron and two
It is respectively welded the first connection fashioned iron between the top of the second fashioned iron of root, is provided between two second fashioned iron and table on pedestal
The second parallel connection fashioned iron of face, the first connection fashioned iron are located at the top of elbow access point pipeline, and the second connection fashioned iron is located at curved
Outside in the middle part of head access point pipeline；It further include third fashioned iron and diagonal brace fashioned iron, third fashioned iron is vertically embedded in pedestal upper surface in advance, the
Three fashioned iron are located on the outside of the three-legged structure that the first fashioned iron and two second fashioned iron are formed；It is close that diagonal brace fashioned iron is connected to third fashioned iron
Between the end of pedestal upper surface and the second connection fashioned iron.
2. a kind of interim thrust block of elbow access point according to claim 1, it is characterised in that: the first fashioned iron is located at elbow
The center point of access point.
3. a kind of interim thrust block of elbow access point according to claim 2, it is characterised in that third fashioned iron is located at elbow
On the angular bisector of access point.
4. a kind of interim thrust block of elbow access point according to claim 2, it is characterised in that the web of the second fashioned iron with
The circle center line connecting of elbow access point is overlapped.
5. a kind of interim thrust block of elbow access point according to claim 2, it is characterised in that two the second fashioned iron and
Saddle support, the arc surface and elbow access point of the saddle support are provided between two connection fashioned iron and elbow tube body access point
Pipeline outer wall matches.
6. a kind of interim thrust block of elbow access point according to claim 1, it is characterised in that the second fashioned iron connects with elbow
Tangent line at access point pipeline inflection point is parallel.
7. a kind of interim thrust block of elbow access point according to claim 1, it is characterised in that two second fashioned iron with it is curved
In being provided with diagonal brace between pedestal upper surface on the outside of head access point pipeline, described diagonal brace one end is welded on vertical corresponding second
On fashioned iron, the other end is welded on the pre-buried short steel of concrete China and foreign countries side group seating face, with the second fashioned iron of Auxiliary support.
8. a kind of design method of the interim thrust block of elbow access point, it is characterised in that the following steps are included:
The first step makees elbow access point plan-position figure, determines the position dimension relationship of connecting bend and existing pipeline；
Second step judges the center location O of elbow, determines that above-mentioned center location is the installation site H0 of the first fashioned iron；
Third step makees the angular bisector of elbow, determines the installation site H1 of third fashioned iron on the angular bisector on the outside of elbow；
4th step, determines the position of first second fashioned iron H2, guarantees that the second fashioned iron abuts existing pipeline, and make web direction with
Proposed elbow tube wall is tangent, so that H2 and circle center line connecting and OH1 angle are minimum, conducive to the transmitting of elbow pressure；
5th step does the mirror image of OH2 using angular bisector as baseline, determines the installation initial position H3 of second second fashioned iron, when
When H3 conflicts with existing pipeline, then along the direction OH3 appropriate adjustment until wing plate and existing tube contacts；
6th step, according to by load simplified mathematical model, checking stress and amount of deflection among cantilever beam and determine fashioned iron specification
Size finely tunes the position of H2 and H3, guarantees that it keeps 5-10cm with newly-built pipeline, saddle support is reserved between fashioned iron and elbow
Welding space；
7th step, it is ensured that concrete pedestal size and location guarantee that protective layer is greater than 15cm on the outside of fashioned iron；
8th step, calculates the size and specification of the second connection fashioned iron, and the first connection fashioned iron is respectively arranged at the first fashioned iron and two
Between at the top of second fashioned iron, the length of the first connection fashioned iron is not less than the spacing between the first fashioned iron and the top of the second fashioned iron；
Second connection fashioned iron is set between two the second fashioned iron, determines peace of the tangent position of elbow inflection point as the second connection fashioned iron
Holding position reserves the welding space of saddle support between the second connection fashioned iron and elbow；
9th step, determines the size and specification and installation site of diagonal brace fashioned iron, diagonal brace fashioned iron be located at the second connection fashioned iron midpoint and
Third fashioned iron exposes between the bottom end of base part.
9. a kind of construction method of elbow access point thrust block, it is characterised in that the following steps are included:
The first step excavates foundation pit below elbow access point pipeline, clears up after-pouring concrete cushion；
Second step, the arrangement of reinforcement banding steel cage in foundation pit, and in the inner side and outer side location and installation H profile steel of elbow access point；
Third step, casting concrete forms pedestal and conserves in foundation pit；
4th step, application pipeline move the water-cut-off changed, normally cut pipeline, assemble elbow and washer；
5th step, connecting bend and new pipeline and old pipeline weld the second connection fashioned iron between adjacent H profile steel, connect second
Diagonal brace is set on the outside of direct type steel, makes the steel casement door that bend access point pipeline is located at H profile steel, the second connection fashioned iron and diagonal brace cooperatively form
In frame, tube wall backing plate and chock are welded, consolidates elbow；
6th step, connecting bend and pipeline, after checking that pipeline has water flowing condition, valve opening water flowing monitors H profile steel malformation feelings
Condition, it is ensured that stability；
7th step continues to bind on the outside of elbow the fast reinforcing bar of permanent thrust, die-filling, completes permanent thrust block by design and pour to apply
Work, interim fashioned iron are poured and are wrapped in permanent thrust block without removing.
10. the construction method of the interim thrust block of elbow access point according to claim 9, it is characterised in that in the 6th step,
All flange bolts of the junction of elbow and pipeline after the installation is completed, install in elbow bell and spigot top side location by place cleaning
Spring displacement meter, is adsorbed on the rectilinear tubes pipe surface of new pipeline and old pipeline by spring displacement meter, and displacement probe is contacted with curved
Head socket ring on, adjustment position make its stabilization, and connect data collector for monitor during trial operation elbow socket deviate from and
Structural deformation conditions.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113202974A (en) * | 2021-06-01 | 2021-08-03 | 中铁四局集团有限公司 | Overlap-connection method for long-distance nodular cast iron pipeline subsection construction |
| CN113346401A (en) * | 2020-09-30 | 2021-09-03 | 中国建筑第二工程局有限公司 | Precise positioning device for tail end of deep pipeline and construction method thereof |
| CN113431958A (en) * | 2021-06-17 | 2021-09-24 | 国家能源聊城发电有限公司 | Pipeline anchor block arrangement method |
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|---|---|
| CN109654295B (en) | 2023-10-20 |
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