CN104481558A - Feet-arch-free principle based reinforcing type lining construction method for steel frame in tunnel transition section - Google Patents

Abstract

The invention belongs to the technical field of lining construction for tunnel transition sections, provides a feet-arch-free principle based reinforcing type lining construction method for a steel frame in a tunnel transition section, an aims at solving the problems of the existing lining construction for the tunnel transition sections. The method comprises the steps of determining seven processing factor data of the steel frame, and the processing truss quantity n of the steel frame in the tunnel transition section; calculating the change rate beta per meter of the seven factors of the steel frame, and the seven processing factor data X1, X2,..., Xn of the steel frames of the n<th> truss; calculating the seven processing factor data at each truss and the size of the transition section according to the processing truss quantity n of the steel frame in the tunnel transition section; processing a steel arch frame according to the calculation dimension, and then reinforcing the steel arch frame. According to the method, the circle center transition data analyzing technology is performed to analyze the transition rules of the circle center, so as to calculate the seven processing factors for the steel arch frame at each truss and accurately control the processing size of the steel arch frame, so as to meet the design clearance requirement; the feet-arch-free principle based reinforcing type lining construction method for the steel frame in the tunnel transition section is carried out; the reinforcing method can be conveniently operated, the reinforcing materials are high in generality, the technology saves both time and work, and the effect is obvious.

Description

Without foot arch principle Strengthening Tunnel transition section lining cutting steelframe construction method

Technical field

The invention belongs to the technical field of tunnel transition section lining construction, be specifically related to a kind of without foot arch principle Strengthening Tunnel transition section lining cutting steelframe construction method.

Background technology

Domestic in tunnel transition section lining construction at present, a kind of mode adopts adjustable overall lining trolley, because the disposable input cost of this chassis is excessive, cannot recycle, adopt less in construction.Another kind of mode adopts simple and easy i iron lining cutting stand construction transition section, in transition section steelframe processing dimension data processing, because method is improper, every Pin steelframe dimension deviation is large, causes the aspect such as lining cutting headroom and the linear aesthetics of outward appearance, cannot meet design and code requirement, its reinforcing process is loaded down with trivial details simultaneously, reinforcement means is single, poor universality chosen by reinforcement material, and nonrecurring cost drops into comparatively large, and reinforced material tool such as cannot to recycle at the shortcoming.Be in addition adopt steel arch-shelf+small ganged steel formwork construction method, but without a set of reduction procedure in the construction and reinforcement measure of entirety, often take a lot of work, take material input cost larger.

Summary of the invention

The problems referred to above that the present invention exists to solve existing tunnel transition section lining construction method, provide a kind of without foot arch principle Strengthening Tunnel transition section lining cutting steelframe construction method.

The present invention adopts following technical scheme to realize: a kind of without foot arch principle Strengthening Tunnel transition section lining cutting steelframe construction method, step is as follows:

1) transition section steel arch-shelf process data, is determined:

1.1), determine that seven factor datas processed by steelframe: according to known lining section widened section and lining cutting standard section data, arch wall lining cutting inner arc outline line progressive formation is by " three-core circle " structure of standard section and 1# circle, 2# circle, the round heart of 3# gradually changes, wherein the 1# center of circle and the 2# center of circle overlap gradually and become 1 center of circle, finally develop into " disloyalty circle " structure adding Wide Band Oxygen Sensors, determine seven factor datas required for machined steel bow member, specifically comprise: inner arc the widest part size, inner arc the widest part height, inner arc clear height, center of circle height, center of circle angle, radius of circle, center of circle eccentric throw.In the data of this seven key element, inner arc refers to the inner outline of arch wall lining cutting, this seven key element measure all in tread face be benchmark;

1.2) transition section steelframe processing Pin number n, is determined: according to known Transition length L1 and every block gang form length L2, determine that transition section needs the steel arch-shelf Pin number n of processing, see formula (1): , in formula: n-steelframe Pin number, L1-Transition length, L2-gang form length;

1.3) every m rate of change β of steelframe seven key element, is calculated: according to known lining cutting widened section section drawing, standard section drawing seven factor data, carry out the calculating of rate of change β, computational methods are shown in formula (2): , β in formula-every m rate of change, An-widened section seven key element, Bn-standard paragraphs seven key element, L1-Transition length;

1.4), calculate n Pin steelframe and process seven factor data X ₁, X ₂... X _n, according to the transition section steelframe processing Pin number n determined, calculate processing seven factor data of each Pin, see formula (3): , in formula: X ₁, X ₂... X _n-the n-th Pin steelframe machining element data, Kn-the n-th Pin steelframe mileage, Kb-standard paragraphs steelframe mileage, β-every m rate of change, Bn-standard paragraphs seven factor data;

1.5), according to above-mentioned 1.2), 1.3), 1.4) step calculates transition section size and forms table 1,

Table 1

2), according to above-mentioned size table machined steel bow member;

3), steel arch-shelf is reinforced: operation stand puts in place, assembled steelframe in hole, measurement and positioning, and steelframe is reinforced: use Φ 22 Bar Anchorage at steelframe footing, steelframe welds with anchor bar, forms fixing feet bearing; The longitudinal dowel of Φ 22 is circular layout at steelframe inward flange, spacing d=1.0 ~ 1.5m; Use Φ 50 steel pipe as diagonal brace, diagonal brace top braces encircles ± 10cm partially in steelframe, supports lower end and is partial to center line 75 ~ 80cm.

Adopt the construction of this method to tunnel big cross section gradual change lining cutting section to be effective, and technique is simple, simple operation, cost is lower.Compared with the simple and easy builder's staging of traditional lining cutting and integral type lining platform building cart, the method of the invention makes full use of waste and old steel and carries out steelframe reinforcing, operating platform utilizes existing splash guard stand construction, 14.336 tons, direct saving i iron, 450, work sky, create direct economic benefit 180,000 yuan, this engineering method also assures that construction safety, accelerate construction speed (3 fan section constructions shortened to February by 3 months) and shorten the duration, social benefit is more remarkable.

First the present invention adopts center of circle gradient data analytic approach technology, by the gradual change law analysis to the center of circle, calculate seven key elements that the every Pin steel arch-shelf machining of processing needs, control steel arch-shelf processing dimension accurately, meet design Clearance requirement, reach interior reality outer beautiful.When adopting steel arch-shelf and little form assembly construction, simplify construction, optimize Scheme of Strengthening, fully reusing, lower construction cost to greatest extent, is unit in charge of construction's direct saving construction cost about 180,000 yuan.The present invention adopts and reinforces transition section lining cutting steelframe construction technology without foot arch principle, good application is had to the construction of highway, railway tunnel and water conservancy diversion cavern equal section lining cutting headroom transition section, namely ensure that lining cutting appearance also reduces difficulty of construction, simply, highly versatile chosen by reinforcement material, and dismounting freely for reinforcement means simple operation simultaneously, making construction, flexible operation, and fully reuse, reduce costs, cheap; Reinforcing technique saves time, saving of labor, consolidation effect are good.Technology of the present invention is not only feasible but also reliable, has a good application prospect, reaches advanced international level.

Accompanying drawing explanation

Fig. 1 is that schematic diagram fixed by steelframe.

In figure: 1-lining cutting; 2-haunch; 3-encircles partially; 4-bow member; 5-operates stand; 6-steel pipe diagonal brace; 7-P30*15 template; 8-18# i iron scaffold; Muscle 20 is tied up bottom 9-; Tread face in 10-.

Detailed description of the invention

Embodiment: for V grade of country rock transition section, arch wall lining cutting inner arc outline line progressive formation is by standard section DK158+836 " three-core circle " structure and 1# is round, 2# is round, the round heart of 3# gradually changes, wherein the 1# center of circle and the 2# center of circle overlap gradually and become 1 center of circle, finally develop into " disloyalty circle " structure adding Wide Band Oxygen Sensors DK158+851.

Known parameters: L1-Transition length (15m), L2-gang form length (1.5m), and key element parameter in table 2.

Table 2: key element parameter list

1, the determination of transition section steelframe Pin number: calculating transition section according to formula (1) needs the steel arch-shelf Pin number n of processing to be 11 Pin, , 2, utilize formula 2) each gradual change key element every m rate of change β calculates, result of calculation is in table 3:

Table 3

3, utilize formula (3) to calculate lining cutting transition section steelframe machining element, obtain table 4: lining cutting transition section steelframe machining element data computational chart, is described for 158848 section steelframe key elements:

X8(inner arc the widest part size)=(158848-158836) × 24.5+561=855cm,

X8(1# circle central angle) °+45 °=73.0 ° ,=(158848-158836) × 2.333,

The round heart radius of X8(3#)=(158848-158836) × (-1.5)+988=970cm.

Table 4:V level lining cutting transition section steelframe machining element data computational chart

Claims (1)

1., without a foot arch principle Strengthening Tunnel transition section lining cutting steelframe construction method, it is characterized in that: step is as follows:

1) transition section steel arch-shelf process data, is determined:

1.1), determine that seven factor datas processed by steelframe: according to known lining section widened section and lining cutting standard section data, arch wall lining cutting inner arc outline line progressive formation is by " three-core circle " structure of standard section and 1# circle, 2# circle, the round heart of 3# gradually changes, wherein the 1# center of circle and the 2# center of circle overlap gradually and become 1 center of circle, finally develop into " disloyalty circle " structure adding Wide Band Oxygen Sensors, determine seven factor datas required for machined steel bow member, specifically comprise: inner arc the widest part size, inner arc the widest part height, inner arc clear height, center of circle height, center of circle angle, radius of circle, center of circle eccentric throw, in the data of seven key elements, inner arc refers to the inner outline of arch wall lining cutting, seven key elements to measure tread face be all benchmark,

1.2) transition section steelframe processing Pin number n, is determined: according to known Transition length L1 and every block gang form length L2, determine that transition section needs the steel arch-shelf Pin number n of processing, calculate and see formula (1): , in formula: n-steelframe Pin number, L1-Transition length, L2-gang form length;

1.3) every m rate of change β of steelframe seven key element, is calculated: according to seven factor datas of known lining cutting widened section section drawing, standard section drawing, carry out the calculating of rate of change β, calculate and see formula (2): , β in formula-every m rate of change, An-widened section seven key element, Bn-standard paragraphs seven key element, L1-Transition length;

1.4), calculate n Pin steelframe and process seven factor data X ₁, X ₂... X _n, according to the transition section steelframe processing Pin number n determined, calculate processing seven factor data of each Pin, calculate and see formula (3): , in formula: X ₁, X ₂... X _n-the n-th Pin steelframe machining element data, Kn-the n-th Pin steelframe mileage, Kb-standard paragraphs steelframe mileage, β-every m rate of change, Bn-standard paragraphs seven factor data;

1.5), according to above-mentioned 1.2), 1.3), 1.4) step calculates transition section size and forms table 1, ;

2), according to above-mentioned size table machined steel bow member;

3), steel arch-shelf is reinforced: operation stand puts in place, assembled steelframe in hole, measurement and positioning, and steelframe is reinforced: use Φ 22 Bar Anchorage at steelframe footing, steelframe welds with anchor bar, forms fixing feet bearing; The longitudinal dowel of Φ 22 is circular layout at steelframe inward flange, spacing d=1.0 ~ 1.5m; Use Φ 50 steel pipe as diagonal brace, diagonal brace top braces encircles ± 10cm partially in steelframe, supports lower end and is partial to center line 75 ~ 80cm.