CN103276645A - Precast pile, beam and slab renovation technology for diseases of existing line tunnel base - Google Patents

Abstract

The invention discloses a precast pile, beam and slab renovation technology for diseases of an existing line tunnel base. The technology is used for reinforcing and renovating of a tunnel which is large in base disease range and serious in disease condition. Piles, beams and slabs are prefabricated outside a hole, restrained beams are used for erecting lines overhead, drilling is conducted, precast piles are embedded, cement slurry is poured, the beams are erected on the piles, the slabs are paved, and railway ballast is backfilled. According to the precast pile, beam and slab renovation technology for the diseases of the existing line tunnel base, the piles, the beams and the slabs are all prefabricated outside the hole, the aspects of materials, dimensions, maintenance and the like are all guaranteed, end product quality is high, and durability is achieved. The pile, beam and slab prefabricating technology is adopted, concentrated batch production can be achieved, the construction time inside the hole can be reduced, the time limit for a project is shortened, and an operation influence is reduced. After the precast piles, the beams and the slabs are constructed, later period maintenance is relatively easy. The precast pile, beam and slab renovation technology has the advantages of being practical, rapid, safe, easy to renovate and thorough in disease treatment.

Description

Existing line tunnel substrate disease preformed pile beam slab regulation technology

Affiliated technical field

The present invention relates to the constructing tunnel field, be specially adapted to the tunnel on a large scale, serious bottom disease regulation problem.

Background technology

The railway tunnel bottom is the underlying structure of track, and the solid of underlying structure firmly is the most important condition that guarantees the track kilter.The existing line tunnel bottom is because a little less than the structure durability design of thin, Drainage Design is unreasonable, construction technology defective, of poor quality, the routine servicing maintenance is not in place, and tunnel bottom is subjected to train nature and the human factor effect of aspect such as power, groundwater erosion repeatedly, substrate occur cracking, damaged, sink, to both sides outside, squeeze and burst and become muddy when a thaw sets in, emit phenomenon such as mud.These diseases all can cause the gauge deviation, rail and joint breaking.If things go on like this, railway operation and passenger's comfortableness is caused adverse effect, when serious even jeopardize traffic safety.How realizing existing line tunnel bottom disease is renovated safely and fast effectively is the current important topic that needs to be resolved hurrily.

For stablizing bedding, eliminate the unfavorable variation of track.At present tunnel bottom disease regulation method is mainly contained: railway roadbed is overhauled, the railway roadbed substrate is changed and filled out, railway roadbed substrate pressure drop etc.

Railway roadbed is overhauled: workload is bigger, repairs slowlyer, and disturbance is bigger, influences the normal operation of train, causes enormous economic loss.

The railway roadbed substrate is changed and filled out: the characteristics of this method are that construction is simple, fast, normal operation influence to train is little, but there is bigger limitation in it, specifically, when the base layer thickness will of substrate is big, it is also relatively large to change the amount of filling out, and the substrate slope excavation also will be taked corresponding supporting measure, from economy and these two words that the aspect is taken all factors into consideration of safety, adopt this method just to seem not too suitable to the darker tunnel of basal layer, and this method is applicable to that the substrate argillic horizon degree of depth is the tunnel of 2.0-5.0m.

Railway roadbed substrate mud jacking: this grouting reinforcement technique mainly refers to build on the ground earlier the slip casting platform, and by holing until the degree of depth of designing requirement downwards outside the position of platform.Insert Grouting Pipe then and in the mode of static pressure grouting consolidation process is carried out in substrate.This method construction is simple, convenient, fast, can effectively improve the intensity on stratum, but consolidation effect is relatively poor on the location that lithic drainage is grown.

After tunnel defect taked above reinforcement measure, through long-term observation, development speed to tunnel defect has had certain alleviation, reinforcement measure plays a role, but tunnel defect does not obtain basic solution, crack quantity can continue to increase, and the width of crack occurrence is also strengthening lentamente, and the length of its cracking also has development.After several years, tunnel defect can be had a relapse, and haves no alternative but and need renovate once again, influences traffic, increases the tunnel maintenance expense.

Along with developing rapidly of China Transportation Industry, the quantity of operation tunnel is also more and more.Because tunnel structure is disguised strong, adds the restriction of existing detection means, the order of severity of tunnel defect and development trend can only deeply exposing along with the regulation construction gradually.Therefore, the long term growth of domestic railway operation must make disease management develop to systematization, standardization direction from existing blindness and local surprise from the existing disease of thorough radical cure tunnel, forms scientific and reasonable tunnel substrate disease regulation worker law system.

Summary of the invention

In view of all drawbacks of existing method, the objective of the invention is to solve the existing line tunnel on a large scale, effective construction difficult problem safely and fast under the disease situation of serious bottom, and reduce the duration in the work progress as far as possible, reduce the influence to operation.

The objective of the invention is to realize by following means.

1) size as required, prefabricated required stake, the prefabricated finished product of Liang Heban in the hole;

2) adopting the restained beam overhead wire, cut slotting according to the riding position of beam to renovating the subbasal soil layer in tunnel, is that beam is prepared placement space;

3) 2) the basis on, the arrangement requirement by stake in slotting is vertically holed, basement rock 40cm is at least goed deep in boring, cleans the stake hole subsequently and imbeds preformed pile, the operation of being in the milk;

4) treat that preformed pile fills after the intensity of slurries reaches 10Mpa, precast beam is erected on the stake, spread precast plate, recover railway ballast and circuit.

It is prefabricated that the present invention requires stake, Liang Heban to adopt outside the hole, and aspects such as material, size and maintenance are all guaranteed, and the end product quality height is durable in use.Adopt stake beam slab prefabricating technique, practicable concentrated batch process can reduce the in-cavity construction time, the reduction of erection time, reduces the influence to operation.After the preformed pile beam slab applied, later maintenance was relatively easy.Preformed pile beam slab regulation technology has practicality, quick, safe, easy reparation, disease management characteristics completely.

Adopt method of the present invention, have the following advantages:

(1) concentrate prefabricated production outside stake, beam and the firm and hard capable hole, quality is secure, reduces the disease recurrence rate, has higher throughput rate and operation degree of freedom.

Facts have proved that (2) after the employing preformed pile beam slab regulation technology, rail level is stable, recovery is fast, it is few that curing time reaches workload less, has good practicality and economic benefit, has broad application prospects.

(3) it is simple to have a job practices, and the efficiency of construction height is repaired workablely again, to advantages such as environmental disturbances are little, is applicable to the regulation of existing line tunnel bottom disease engineering.

Description of drawings

Fig. 1 is beam of the present invention and stake layout schematic diagram

Fig. 2 is Ι among Fig. 1-Ι cross section arrangement diagram

Fig. 3 is II-II sectional drawing among Fig. 2

Fig. 4 is III-III sectional drawing among Fig. 3

Fig. 5 is IV-IV sectional drawing among Fig. 3.

Illustrate: 1 is beam (girder construction) among the figure, and 2 is stake (pilework), and 3 is plate (plated construction), and 4. metallic gasket is the tunnel bottom disease management measure structure that patent content adds, and remainder is original engineering structures in the railway tunnel.

Reference numeral explanation: 1 beam, 2,3 plates, 4 metallic gaskets, 5 substrate fillers, 6 tunnel inverts, 7 Tunnel Second Lining, 8 cable channels and ditch 9, railway ballast structure, 11 grooves.

The specific embodiment

The invention will be further described below in conjunction with accompanying drawing:

(1) according to the requirement of tunnel substrate disease regulation, prefabricated production cylinder pile, Liang Heban, beam as shown in Figure 4, plate is as shown in Figure 5.

(2) adopt the restained beam overhead wire, as shown in Figure 1, according to the riding position requirement of girder construction 2, underlying structure is carried out slotting 11 earlier, groove 11 is vertical with track.According to the placement requirement of pilework 2, carry out bore operation at beam in slotting.

(3) as shown in Figure 2, clean the stake hole and imbed preformed pile 2, the space around the operation compaction pile that is in the milk;

(4) after the intensity for the treatment of the filling slurries of preformed pile and hole wall reaches 10Mpa, place metal caul 4 at the stake top, precast beam is erected in the stake that is placed with metal caul, as shown in Figure 3.

(5) lay precast plate 3 at beam, recover railway ballast, remove restained beam and circuit.

Obviously, those skilled in the art also can make other applications in basic scheme of the present invention enforcement changes, and the variation that these are done according to spirit of the present invention all should be included in the present invention's scope required for protection.

Claims (1)

1. existing line tunnel substrate disease preformed pile beam slab regulation technology is used for the comparatively serious tunnel reinforcement regulation of the big disease of substrate disease scope, and its working procedure comprises the steps:

1) size as required, prefabricated required stake, the prefabricated finished product of Liang Heban in the hole;

2) adopting the restained beam overhead wire, cut slotting according to the riding position of beam to renovating the subbasal soil layer in tunnel, is that beam is prepared placement space;

3) 2) the basis on, the arrangement requirement by stake in slotting is vertically holed, basement rock 40cm is at least goed deep in boring, cleans the stake hole subsequently and imbeds preformed pile, the operation of being in the milk;

Treat that preformed pile fills after the intensity of slurries reaches 10Mpa, precast beam is erected on the stake, spread precast plate, recover railway ballast and circuit.

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