CN111499336B - Cuttable material for reinforcing tunnel portal - Google Patents
Cuttable material for reinforcing tunnel portal Download PDFInfo
- Publication number
- CN111499336B CN111499336B CN202010364181.1A CN202010364181A CN111499336B CN 111499336 B CN111499336 B CN 111499336B CN 202010364181 A CN202010364181 A CN 202010364181A CN 111499336 B CN111499336 B CN 111499336B
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- China
- Prior art keywords
- cuttable
- parts
- tunnel portal
- reinforcing
- shield
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/24—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
Abstract
The invention relates to a cuttable material for reinforcing a tunnel portal, in particular to a reinforcing material for construction at an initial tunnel portal and an end tunnel portal of a shield tunneling machine, a preparation method of the material and a construction method of the material. The reinforcing material comprises A, B two component materials reinforced by modified silicate and polyethylene fiber, and an I-shaped material prepared by mixing A, B material reinforced by modified silicate and polyethylene fiber plays a role in reinforcing when the shield machine enters a hole. The invention has the following advantages: 1. the material has higher strength and can meet the reinforcement requirement of the opening; 2. the material can be cut by the shield machine, so that the construction steps of the shield machine entering the hole are reduced, and the construction efficiency is improved; 3. the cuttable material is convenient to manufacture and transport.
Description
Technical Field
The invention belongs to the technical field of shield tunnel construction reinforcement, and particularly relates to a cuttable material, a preparation method of the cuttable material and a reinforcement material convenient for construction when a shield machine starts and reaches an end opening.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
The shield method construction technology is an excellent tunnel mechanical construction method, is widely applied in the urban tunnel construction process, can perform tunnel excavation under the condition of hardly influencing the normal traffic of the ground, has high tunnel construction mechanization degree and good tunnel forming quality, and is more and more widely applied in the urban tunnel construction process in China in recent years. In the shield engineering, due to stratum pressure relief during shield receiving, collapse accidents easily occur on the stratum with poor stability, and the safety construction of the shield is seriously influenced.
The starting and receiving construction is one of the difficulties of shield construction, and the technical measures usually adopted are to adopt a stirring pile, a jet grouting pile, ground grouting or freezing method to reinforce or improve the stratum at the end head before the shield enters or exits the hole, so as to improve the stability of the stratum. At present, the starting or receiving end reinforcement of the shield construction technology adopts a reinforced concrete structure, so that the shield machine cannot directly cut a tunnel portal, and the reinforced concrete structure at the tunnel portal needs to be manually chiseled off before the starting or receiving of the shield machine, thereby greatly prolonging the engineering period and reducing the construction efficiency.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a grouting material for reinforcing a weak stratum at a shield starting or receiving end and a preparation method thereof. The invention is realized by the following technical scheme:
according to the first aspect of the invention, the cuttable material is used for reinforcing the stratum of the starting or receiving end of the shield tunneling machine, and the raw materials for preparing the cuttable material comprise modified portland cement and polyethylene fibers.
The modified portland cement consists of a material A and a material B, wherein the material A consists of water glass, diphenylmethane diisocyanate and sodium dodecyl benzene sulfonate; the material B consists of polyurethane, diisodecyl adipate and dimethylethanolamine;
the present invention aims to provide a material for reinforcing a tunnel opening, which has a higher requirement for strength and which needs to be cuttable by a shield machine and which does not disintegrate after being cut. In order to meet the use requirements, the silicate cement material is doped by the polyethylene fibers, the components of the silicate cement material are adjusted, and the strength of the improved silicate cement is improved by 3-4 times compared with that of the grouting material in the prior research.
In a second aspect of the invention, there is provided a method for preparing the cuttable material of the first aspect, the method comprising the steps of: and uniformly stirring the modified Portland cement A material and polyethylene fibers, adding the mixture into a mold, adding the modified Portland cement B material into the mold while stirring, standing for 8 days after uniform stirring, and demolding to obtain the shield tunnel portal reinforcing material.
In a third aspect of the invention, the shield tunnel portal reinforcing material comprises the cuttable material in the first aspect as a shield tunneling machine excavation area material.
The beneficial effects of one or more technical schemes are as follows:
(1) the cuttable material is formed by mixing polyethylene fibers and a modified silicate reinforced A, B material, has high material strength, and can meet the requirement of reinforcing the end of the inlet and outlet hole of the shield machine.
(2) The cuttable material is prefabricated into an I-shaped material which is easy to splice with common I-shaped steel, construction is convenient, and the performance of the prefabricated material is easy to control.
(3) When the shield machine enters the tunnel, the tunnel mouth does not need to be dug again, and the shield machine directly tunnels, so that the construction steps are reduced, the construction progress is accelerated, and the safety of the project is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is a schematic structural view of a reinforcing material for a shield tunnel portal in example 1;
FIG. 2 is a schematic view of the structure of the cuttable material described in example 1.
Fig. 3 is a schematic structural view of the i-shaped connector described in embodiment 1.
Fig. 4 is a schematic structural view of the reinforcing material and the i-shaped connecting member in example 1.
Fig. 5 is a schematic structural view of the prefabricated form in embodiment 1.
Fig. 6 is a schematic view of the structure of the side baffle in embodiment 1.
Fig. 7 is a schematic view of the lower bottom plate structure described in embodiment 1.
Wherein, in fig. 1 to 7, 1: a common I-steel reinforcement area; 2: an I-shaped cuttable material reinforced area; 3: excavating an area by the shield tunneling machine; 4: a concrete pouring area; 5: the I-shaped material can be cut; 6: an I-shaped connecting piece; 7: flange outer side 8: flange inner side 9: a bolt opening; 10: a notch is reserved on the inner side; 11: an auxiliary steel plate; 12: a stirrer; 13: a lateral baffle; 14: a support bar; 15: and a lower bottom plate.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As introduced by the background art, aiming at the defects in the prior art, the invention provides a reinforcing material for construction at the beginning of a shield machine and at the end opening, a preparation method of the material and a construction method of the material.
According to the first aspect of the invention, the cuttable material is provided, and the preparation raw materials of the cuttable material comprise modified portland cement and polyethylene fibers.
Preferably, the modified portland cement is composed of a material A and a material B, and the material A comprises the following raw materials in parts by weight: 50-60 parts of water glass, 30-40 parts of diphenylmethane diisocyanate and 2-3.5 parts of sodium dodecyl benzene sulfonate; the material B comprises the following raw materials in parts by weight: 35-45 parts of polyurethane, 15-25 parts of diisodecyl adipate and 2-3 parts of dimethylethanolamine.
Further preferably, the material A comprises the following raw materials in parts by weight: 52-58 parts of water glass, 32-38 parts of diphenylmethane diisocyanate and 2-3.5 parts of sodium dodecyl benzene sulfonate.
Further preferably, the material B comprises the following raw materials in parts by weight: 37-42 parts of polyurethane, 17-23 parts of diisodecyl adipate and 2-3 parts of dimethylethanolamine.
Preferably, the doping ratio of the polyethylene fibers to the portland cement is 0.8-1.2: 0.8-1.2 according to the weight ratio of the polyethylene fibers to the material A; further preferably, the weight ratio is 1: 1.
In a second aspect of the invention, there is provided a method for preparing the cuttable material of the first aspect, the method comprising the steps of: adding the modified Portland cement and the polyethylene fibers into a mold, stirring for a period of time, standing and demolding to obtain the shield tunnel portal reinforcing material.
Preferably, the modified portland cement and the polyethylene fiber are mixed in the following manner:
mixing the material A with polyethylene fiber, and adding the material B for mixing.
Preferably, the stirring time is 1-3 min.
In a third aspect of the invention, the shield tunnel portal reinforcing material comprises the cuttable material in the first aspect as a shield tunneling machine excavation area material.
Preferably, the reinforcing material for the shield tunnel portal is connected with the I-shaped steel through a connecting piece and an auxiliary steel plate to form the reinforcing fence for the shield tunnel portal.
Preferably, the connecting piece is I-shaped, and the flange of the connecting piece is connected with the I-shaped steel through a bolt.
Preferably, the method further comprises the step of pouring concrete after the shield tunnel portal reinforcing material is connected with the I-shaped steel through the connecting piece and the auxiliary steel plate.
In order to make the technical solutions of the present invention more clearly understood by those skilled in the art, the technical solutions of the present invention will be described in detail below with reference to specific embodiments.
Example 1
In the embodiment, the structure of the reinforcing material for the shield tunnel portal is shown in figure 1, the reinforcing material is arranged at the tunnel portal in a strip shape and used for reinforcing soft soil, the reinforcing material comprises three parts, namely an I-shaped cuttable material 5, an I-shaped connecting piece 6 and I-shaped steel, the I-shaped cuttable material 5 and the I-shaped steel are connected through the I-shaped connecting piece 6 to form a strip shape and are arranged as shown in figure 1, and the I-shaped cuttable material forms an I-shaped cuttable material reinforcing area 2. And meanwhile, 1I-steel in a common I-steel reinforcing area outside the range of the tunnel portal of the shield tunneling machine is arranged, and concrete is poured in an I-steel gap 4. After the concrete reaches enough strength, the shield machine can directly cut the I-shaped cuttable material reinforced area 2 for tunneling without digging a hole or dismantling a steel plate.
The structure of the I-shaped connecting piece 6 is shown in figure 3, a bolt opening is formed in the flange of the I-shaped steel connecting component 6, the flange is divided into an inner side 8 and an outer side 7, and a reserved notch in the inner side 8 is spliced with I-shaped steel. The inner side 8 of the flange of the connecting piece is connected with the I-shaped steel, and the outer side 7 of the flange of the connecting piece is spliced with the auxiliary steel plate 11. The width of the reserved notch on the inner side 8 is consistent with that of a web plate of the I-shaped steel.
The I-shaped connecting piece 6 is made of steel.
The reserved bolt openings of the inner side 8 and the outer side 7 of the connecting piece wing correspond to each other, and the number of the bolt openings is determined according to the width of the flange of the I-shaped cuttable material.
The cuttable material 5 is prepared from modified portland cement and polyethylene fibers, wherein the modified portland cement comprises 55 parts of a material A, namely water glass, 35 parts of diphenylmethane diisocyanate, 3.5 parts of sodium dodecyl benzene sulfonate, 40 parts of a material B, namely polyurethane, 20 parts of diisodecyl adipate and 2.5 parts of dimethylethanolamine. When in use, the material A is mixed with 90 parts of polyethylene fiber, and then the material B is added and stirred. The preparation process also includes prefabricating the template.
The prefabricated form is shown in fig. 5-7 and comprises a lower base plate 15, a side baffle plate 13, a support rod 14 and a stirrer 12. The lower base plate is firstly fixed, the lateral baffle plates are arranged on the lower base plate and are fixed by the supporting rods 14, and the prefabricated formwork is installed. And adding the modified silicate A material and the fiber layer into the prefabricated template, then placing a stirrer into the prefabricated template, fully mixing the silicate AB material by rotating the stirrer while injecting the modified silicate material B, injecting the modified silicate material B until the material reaches the highest position of the lateral plate, stopping injecting, slowly taking out the stirrer after continuously stirring for 2 minutes, and demolding after the strength of the reinforcing material reaches the requirement within 3 hours. Demoulding is carried out to remove the support rod 14, then the lateral plates 13 and finally the I-shaped reinforcing material.
Example 2
The cuttable material 5 prepared in the embodiment 1 is used for manufacturing a test block and testing the mechanical property of the material, and the test block is manufactured according to the mechanical property test specification of the glass fiber reinforced plastic product. The short term strength and final strength results for the tested materials are shown in table 1.
TABLE 1 Material parameter Table
| Compressive strength Mpa | Tensile strength Mpa | Shear strength Mpa | Flexural modulus Mpa | Specific gravity of | |
| 8 hours | 80 | 90 | 25 | 20000 | 1.8 |
| 8 days | 140 | 160 | 50 | 38000 | 1.8 |
As can be seen from the data in Table 1, the strength of the modified portland cement material provided in example 1 still shows a gradual increase trend after molding, and the strength at day eight can be doubled. Such material is convenient for punch operation at the beginning of the shaping and is connected with the I-steel spare, strengthens gradually along with placing the intensity, is applied to the tunnel entrance to a cave and supports, can effectual reinforcement weak soil body.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The cuttable material is characterized in that raw materials for preparing the cuttable material comprise modified portland cement and polyethylene fibers;
the modified portland cement is composed of a material A and a material B, wherein the material A comprises 50-60 parts of water glass, 30-40 parts of diphenylmethane diisocyanate (MDI) and 2-3.5 parts of sodium dodecyl benzene sulfonate; the material B comprises 35-45 parts of polyurethane, 15-25 parts of diisodecyl adipate and 2-3 parts of dimethylethanolamine.
2. A method for preparing the cuttable material according to claim 1, characterized in that the preparation method comprises the steps of: adding the modified Portland cement and the polyethylene fibers into a mold, stirring for a period of time, standing and demolding to obtain the shield tunnel portal reinforcing material.
3. The method for preparing the cuttable material according to claim 2, wherein the modified portland cement and the polyethylene fiber are mixed in the following manner: mixing the material A with polyethylene fiber, and adding the material B for mixing.
4. The method for preparing the cuttable material according to claim 2, wherein the stirring time is 1-3 min.
5. A shield tunnel portal reinforcement material, characterized in that it comprises a cuttable material according to claim 1 as shield machine excavation area material.
6. The shield tunnel portal reinforcement of claim 5, wherein the shield tunnel portal reinforcement is connected to the I-beam by a connector and an auxiliary steel plate.
7. The shield tunnel portal reinforcement of claim 6, wherein the connecting member is I-shaped, and a flange thereof is connected to the I-shaped steel by a bolt.
8. The reinforcing material for the opening of the shield tunnel according to claim 6, wherein the reinforcing material for the opening of the shield tunnel is connected with the I-shaped steel through the connecting member and the auxiliary steel plate, and further comprises a step of pouring concrete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010364181.1A CN111499336B (en) | 2020-04-30 | 2020-04-30 | Cuttable material for reinforcing tunnel portal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010364181.1A CN111499336B (en) | 2020-04-30 | 2020-04-30 | Cuttable material for reinforcing tunnel portal |
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| CN111499336A CN111499336A (en) | 2020-08-07 |
| CN111499336B true CN111499336B (en) | 2021-06-29 |
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