CN106640125A - Positive and negative protection combined construction technology of modularized prevention of base plate deformation - Google Patents

Abstract

The invention discloses a positive and negative protection combined construction technology of modularized prevention of base plate deformation adopted for the roadway base plate. A technology capable of utilizing an existing lithologic condition in a soft rock roadway base plate, improving support strength by improving the nature of the bottom surrounding rock and by combining positive and negative protection and increasing repeated utilization rate of a support material at the same time is provided. Combined prefabricated concrete block roadway base plate layer, a buffer layer combined by macadam and fine sand, an aquiclude composed by rolling of a polyethylene material, roadway mudstone, quicklime and clay, and a high-strength pressure bearing layer are paved in sequence from top to bottom. The positive and negative protection combined construction technology of the modularized prevention of the base plate deformation adopted for the roadway base plate has strong practical value, and meanwhile is convenient to carry out and maintain.

Description

The construction technology that a kind of main passive protection of module chemoprevention base plate soft rock modification is combined

Technical field

The present invention is the construction technology combined with passive protection with regard to a kind of active of the module chemoprevention base plate soft rock modification adopted in roadway floor.

Background technology

At present, mining area digging laneway in soft rock, the problems such as by mine pressure and water burst, easily there is Floor Heave in Roadway phenomenon, especially in expansile mud stone, pucking phenomenon is even more serious, to prevent Floor Heave in Roadway from deforming, people take such as anti-bottom to encircle many kinds of measures, but effect is undesirable, and repair of laneway rate is higher.

The conventionally employed shotcrete bottom arch mode of mine, its bottom arch curing condition is poor, and construction is complicated, reprocesses difficulty；Woollen barnacle builds bottom arch mode, and its bottom arch construction waits until that pressure from surrounding rock obtains being constructed in the lump with secondary supporting after fully release, and the roadway construction time is long, high labor intensive；There are indivedual methods using bolt anchorage, but effect is bad, once pucking anchor pole occurs tilt, it is difficult to process.

The content of the invention

It is an advantage of the invention that：There is provided one kind can utilize existing lithology condition in soft floor tunnel, by improveing bottom rock property, to improve supporting intensity by way of active is in combination with passive protection, while also lifting the repeat usage of support material.

The present invention rolls the water barrier and high intensity bearing course of composition using cushion, polythene material and the tunnel mud stone and quick lime, clay etc. that the precast concrete block roadway floor layer, rubble and fine sand that combine are combined, and falls down from above and lays successively.

The method for employing layering laying soft floor：Ground floor, concrete block does base plate directly come suffered stress in bearing tunnel transport and constructing, and two kinds of different designs size concrete modulars can more preferably combine laying and safeguard.The structure of disassembly design that facilitates of ground floor ensure that the pressure-bearing on tunnel surface and smooth.The cushion that the second layer is made up of fine sand and rubble, the bottom deformation for reasonably adjusting and adapting to tunnel by changing the thickness of the second layer.Third layer water barrier, in this layer surface the PVC film of water proof is laid, the pavement side laying resistance to compression superelevation pipe in tunnel, and the uniform punching in tube wall top makes the infiltration of base plate come together in this using compound clay layer capillarity, is discharged by pvc pipe.

4th layer is to make full use of the mud stone and shale characteristic in floor rocks, is processed into the material of the similar compound tabia of high intensity.The soft rock of base plate is mainly made up of mud stone and shale.Mud stone is a kind of sedimentary rock solidified by mud and clay, and its composition is similar but less frangible to construction and shale, and a kind of layer is managed or the unconspicuous clay rock of the laminated structure of shale.Shale is a kind of sedimentary rock, complicated component, but the joint all with thin laminated or thin slice stratiform, mainly deposits the rock that Jing pressure and temperatures are formed by clay.We by mud stone and shale it is broken after, and the mixing of fine sand, white lime rolls to form resistance to compression layer.

Description of the drawings

In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing to be used needed for embodiment or description of the prior art will be briefly described below.

Fig. 1. Fig. 2 is the overall structure figure of the present invention, and Fig. 2 is the enlarged drawing of Fig. 1

Mainly there are A layers, B layers, C layers, D layer four-layer structures to lay successively

A layers-concrete block top layer B layers-cushion C layers-water barrier D layers-rolling layers

Fig. 3. Fig. 4 is the specification of A layers-concrete block.

Specific embodiment

Enforcement to this patent below in conjunction with the accompanying drawings is illustrated：

Implementation：

The preparation of the concrete block of Fig. 3 Fig. 4：Mould is made according to the specification shown in figure, is made more than compression strength 20Mpa by the rational proportioning of concrete, surfacing.

Normal to excavate tunnel, base plate is backbreak 1m or so depth, is backbreak and two is helped the normal shotcrete in base angle.Mud stone, shale are crushed after excavating out and fine sand, white lime mixing are with 3:2:1 or 5:3:2 (volume ratios).This proportioning has in a humid environment good use value.Intensity can gradually strengthen.Simultaneously the size shape of mud stone and shale can not be too big, it is impossible to more than 30mm.The soil's water content mixed of proportioning is advisable with " holding agglomerating with a firm grip, landing is scattered ".The concrete of mixing match is rolled into laying, rolling intensity will make compression strength that 5Mpa or so is reached after condensation, and the thickness of laying is half meter or so, can lay three layers, 5 cun per layer.

Water proof material is laid on smooth D layers are rolled, the laying of water proof material needs the gradient 2% somewhat having in the side for having ditch both may be used.This layer of ditch downside laying pvc pipe, water proof material will be laid more than pvc pipe, and the half of punching is upwards.Height 50cm as shown in the figure.Pvc pipe is unsuitable long, and 4 ~ 10 meters or so, caliber 40mm both may be used.

Cushion, rubble and fine sand ratio 1 are laid on water proof material：2 ~ 5, laying is uniform, and modular removable concrete block is laid on the buffer layer, and in sleeper lower berth Fig. 3 class concrete blocks are set, and goes out to lay Fig. 4 class concrete blocks at other.

Claims (10)

1. a kind of combination xoncrete structure of module chemoprevention roadway floor soft rock modification, it is characterised in that：In soft-rock tunnel base plate paving using layering, removable form block structure.

2. a kind of combination xoncrete structure of module chemoprevention roadway floor soft rock modification, it is characterised in that：Active resistance to compression and passively release pressure reasonable combination that roadway floor laying reply deforms.

3. the combination xoncrete structure of the module chemoprevention roadway floor soft rock modification according to claims 1, it is characterised in that：Order laying is carried out using 4 ~ 5 layer materials.

4. the combination xoncrete structure of the module chemoprevention roadway floor soft rock modification according to claims 1, it is characterised in that：The laying of tunnel surface A layer adopts the concrete block of special shape.

5. the combination xoncrete structure of the module chemoprevention roadway floor soft rock modification according to claims 1, it is characterised in that：Roadway floor second layer B layers adopt rubble, fine sand ratio 1：2~5.

6. the combination xoncrete structure of the module chemoprevention roadway floor soft rock modification according to claims 1, it is characterised in that：Base plate third layer C layer adopts water proof material-paving.

7. the combination xoncrete structure of the module chemoprevention roadway floor soft rock modification according to claims 1, it is characterised in that：Resistance to compression pvc pipe, caliber 40mm, pvc pipe and ditch parallel laid are laid in base plate third layer C layer pavement side, are provided with the 3 ‰ water conservancy gradient.

8. resistance to compression pvc pipe is laid according to claim 7, it is characterised in that：Uniformly infiltration is dredged in punching for pvc pipe upper surface.

9. a kind of combination xoncrete structure of module chemoprevention roadway floor soft rock modification, it is characterised in that：The base plate paving bottom is rolled into resistance to compression layer D layers using the mud in fine sand, white lime, soft rock, shale.

10. mud in fine sand according to claim 9, white lime, soft rock, shale rolling layers, it is characterised in that:The ratio 3 of mud, shale in fine sand, white lime, soft rock：2：1 or 5：3：2.