阅读说明：本技术 用于隧道支护的预制装配式空间网架结构及其施工方法 (Prefabricated assembled space grid structure and its construction method for tunnel support ) 是由 雷升祥 张旭东 夏明锬 梅灿 彭星新 张志勇 杨旭 董云生 黄明利 宋远 于 2019-09-16 设计创作，主要内容包括：本发明提供的一种用于隧道支护的预制装配式空间网架结构及施工方法。所述预制装配式空间网架支护结构包括至少两块预制的网架支护构件,网架支护构件之间通过连接构件连接形成截面与支护隧道断面形状相同的封闭支护结构；其施工时,根据隧道支护结构的各项参数设定值和隧道模型计算出隧道支护结构的内力参数,得到最终隧道支护结构的施工参数值,制备出每环预制装配式空间网架支护结构的网架支护构件,隧道开挖后,在已经完成的开挖段快速拼装预制的网架支护构件形成隧道支护闭合环,完成多环网架构件拼装再进行喷射混凝土。本发明的结构简单、组装方便,无需喷射混凝土,依靠网架结构自身即可承担全部隧道荷载,提高施工效率。(A kind of prefabricated assembled space grid structure and construction method for tunnel support provided by the invention.The prefabricated assembled space net rack supporting construction includes at least two blocks prefabricated rack support units, passes through connecting elements connection Formation cross-section closing supporting construction identical with supporting tunnel cross-section shape between rack support unit；When it is constructed, the interior force parameter of tunnel support structure is calculated according to the parameters setting value and tunnel model of tunnel support structure, obtain the construction parameter value of final tunnel support structure, prepare the rack support unit of the prefabricated assembled space net rack supporting construction of every ring, after tunnel excavation, tunnel support close ring is formed in the prefabricated rack support unit of the excavation section quick-assembling completed, the assembly of multi-ring network frame member is completed and carries out gunite concrete again.Structure of the invention is simple, easy to assembly, is not necessarily to gunite concrete, can undertake whole tunnel loads by grid structure itself, improve construction efficiency.)

1. a kind of prefabricated assembled space grid structure for tunnel support, it is characterised in that: the prefabricated assembled space Rack supporting construction includes at least two blocks prefabricated rack support units (1), and the both ends of every piece of rack support unit (1) are set respectively There is the connecting elements (7) connecting with adjacent rack support unit (1), at least two pieces of rack support units (1) pass through connection from beginning to end Component (7) connects Formation cross-section closing supporting construction identical with supporting tunnel (2) section configuration；Every block of rack support unit It (1) is the lattice support structure being made of top boom (3), lower boom (4) and web member (5), top boom (3) forms rack branch What shield component (1) was contacted with tunnel (6) inner wall meets native wire side, and lower boom (4) forms the back soil wire side of rack support unit (1), Web member (5) is connected between top boom (3) and lower boom (4), and is separated to form between top boom (3) and lower boom (4) more A grid cell is equipped with metal mesh (6) in the native wire side of meeting of every piece of rack support unit (1).

2. a kind of prefabricated assembled space grid structure for tunnel support according to claim 1, it is characterised in that: It is triangle, square, rectangle, pentagon or six sides that the grid cell of the rack support unit (1), which meets native face and carries on the back native face, Shape, facade are triangle.

3. a kind of prefabricated assembled space grid structure for tunnel support according to claim 1, it is characterised in that: The grid type support frame that the rack support unit (1) is made of multiple triangular pyramids or multiple rectangular pyramids or multiple hexagonal pyramids.

4. a kind of prefabricated assembled space grid structure for tunnel support according to claim 1, it is characterised in that: The top boom (3) and lower boom (4) of the rack support unit (1) are by appointing in steel pipe, fashioned iron, reinforcing bar, concrete filled steel tube One or more of rod pieces of anticipating pass through welding or the arc body of rod for being directly bent or being formed by connecting by connector；And in top boom (3) arch-shaped space truss structure is formed by welding or connector connection web member (5) between lower boom (4), the web member (5) is steel Pipe, fashioned iron, reinforcing bar, any one or a few rod piece in concrete filled steel tube.

5. a kind of prefabricated assembled space grid structure for tunnel support according to claim 1, it is characterised in that: The connecting elements (7) is the joggle connector being mutually matched or sleeve connector or bayonet connection or grafting or welded connecting Part, the first connector (7-1) and the second connector (7-2) that each connecting elements (7) is mutually matched are separately positioned on adjacent two The docking site of a rack support unit (1), and the connecting elements (7) at the both ends of each rack support unit (1) also phase Mutually matching；At least two rack support units (1) by the first connector (7-1) and the second connector (7-2) using splicing or It welds or splices the mode combined with welding and connect into section annular identical with supporting tunnel (2) cross sectional shape, rectangle, horseshoe Shape or polygon closed supporting construction.

6. a kind of construction method of the prefabricated assembled space grid structure for tunnel support, which is characterized in that the right It is required that the prefabricated assembled space net rack supporting construction in 1 to 5 any one includes at least two rings, Specific construction step is such as Under:

(1) the parameters setting value and tunnel model of tunnel support structure are obtained；And according to the parameter item setting value and tunnel Road model calculates the load load of the tunnel support structure and the elasticity modulus of equivalent space shell；By the load load and Input of the elasticity modulus as finite element algorithm calculates the interior force parameter of the tunnel support structure, according to the internal force Parameter verifies the safety of the tunnel support structure, obtains corresponding verification result, finally according to the verification result, adjusts The value of the whole parameter item obtains the construction parameter value of final tunnel support structure；

(2) according to the construction parameter value of the tunnel support structure calculated in step (1), the prefabricated assembled space of every ring is determined The segmentation of rack supporting construction, and select suitable rod piece prefabricated assembled in factory or the every ring of field fabrication according to segmentation situation The monolithic rack support unit of space net rack supporting construction and the connector of rack support unit；

(3) after tunnel excavation, tunnel branch is formed in the prefabricated monolithic rack support unit of the excavation section quick-assembling completed Protect close ring；

(4) continue tunneling, and in the assembled next prefabricated assembled space net rack supporting construction of ring of excavation section；

(5) it according to engineering practice, completes after the prefabricated assembled space net rack supporting construction of monocycle or to complete several rings prefabricated After assembled space net rack supporting construction, injection or casting concrete in rack supporting construction, and by prefabricated assembled space Rack supporting construction is wrapped to form liner structure.

7. a kind of construction method of prefabricated assembled space grid structure for tunnel support according to claim 6, It is characterized by: the parameter of tunnel support structure includes the prefabricated assembled space net rack supporting construction of monolithic in the step (1) Longitudinal supporting length, the longitudinal cross-section body of rod radical of every linear meter(lin.m.) tunnel support structure, the thickness of preliminary bracing, the body of rod material Thickness, the diameter of connector, the circumferential spacing of connector, rod piece and the dimensioning of the material of fitting, rod piece and connector repeatedly Whole parameters or any several parameters in very little.

8. a kind of construction method of prefabricated assembled space grid structure for tunnel support according to claim 6, It is characterized in that the load load of the tunnel support structure calculated in the step (1) includes the self weight of tunnel support structure The external load of load and tunnel support structure；

Wherein, 1. the gravity load f of the tunnel support structure is calculated using formula

F=γ₁bh₁；①

Formula 1. in, γ₁Indicate the concrete severe of the tunnel support structure, b indicates computing unit longitudinal width, h₁Described in expression The thickness of tunnel support structure；

The external load of the tunnel support structure includes the stratum drag that tunnel support structure is born and tunnel support structure institute The calculating of at least one in the pressure from surrounding rock of receiving；Wherein, the pressure from surrounding rock that tunnel support structure is born includes tunnel branch The vertical well-distributed pressure of the country rock that protection structure is born and horizontal well-distributed pressure；

After the pressure from surrounding rock that tunnel support structure is born calculates completion, the pressure from surrounding rock is adjusted according to load factor, Wherein, the load factor is the ratio of payload values and maxium load value that tentative calculation passes through.

9. a kind of construction method of prefabricated assembled space grid structure for tunnel support according to claim 8, It is characterized in that the stratum drag calculating process that the tunnel support structure is born is as follows:

(1) Winkler's assumption algorithm is used, the stratum resistance coefficient of the tunnel model is calculated；

(2) by rigid bar method, the stratum drag that the tunnel support structure is born is calculated according to the stratum resistance coefficient.

10. a kind of construction method of prefabricated assembled space grid structure for tunnel support according to claim 8, It is characterized in that in the case where the tunnel model is deep tunnel:

2. the vertical well-distributed pressure q of the country rock that the tunnel support structure is born is calculated using following formula,

Q=γ₂h_q ②

Formula 2. in, h_q=first constant × 2^S-1W, w=second constant+i (B- three constant)；γ₂Indicate country rock severe, h_qTable Show that country rock collapses and encircle computed altitude, S indicates that Grades of Surrounding Rock, w indicate that widths affect coefficient, B indicate that tunnel excavation width, i indicate Every pressure from surrounding rock gradient for increasing unit length；

The horizontal even cloth pressure of the country rock that the tunnel support structure is born is born by the tunnel support structure of above-mentioned calculating The product of country rock vertical well-distributed pressure q and particular factor；Wherein, the value of the particular factor is related to Grades of Surrounding Rock.

11. a kind of construction method of prefabricated assembled space grid structure for tunnel support according to claim 8, It is characterized in that, in the case where the tunnel model is shallow tunnel:

3. the vertical well-distributed pressure q of the country rock that the tunnel support structure is born is calculated using formula,

Wherein,

γ₂Indicate country rock severe, h₂Indicate the height of tunnel top from the ground, λ indicates that lateral pressure coefficient, θ indicate tunnel top two The angle of friction of side, B indicate that tunnel excavation width, β indicate angle of rupture when maximum thrust,Indicate that country rock calculates angle of friction；

The horizontal even cloth pressure e of the country rock that the tunnel support structure is born_iIt is 4. calculated using formula,

e_i=γ₂h_iλ ④

Wherein, γ₂Indicate country rock severe, h_iIndicate the distance on outside arbitrary point to ground in tunnel, λ indicates lateral pressure coefficient.

Technical field

The invention belongs to tunnel construction technical fields, and in particular to a kind of prefabricated assembled sky for tunnel support Between grid structure and its construction method.

Background technique

Tunnel construction because of landform, complex geologic conditions are changeable that different degrees of disaster easily occurs, lead to tunnel support Structure deforms, and generates threat to Tunnel Stability to some extent, serious to be unable to satisfy design lining section requirement, shadow Tunnel safety construction is rung, especially brings great difficulty to the constructing tunnel that span is big, structure is complicated, deformation requirements are stringent.At present Traditional Tunnel structure has shotcrete structure, grid supporting, armored concrete supporting construction etc., existing supporting construction It is not able to satisfy its requirement in terms of bearing capacity and support time.By taking most commonly seen grid supporting construction as an example, grid Supporting construction is to spray mixed, anchor pole, steel mesh collective effect with grid steel frame, profile steel frame cooperation, and steelframe is indulged as unit of Pin To the general 0.5~1.5m/ Pin of spacing.Due to the weak characteristic of its discreteness and grid steel frame self-bearing capacity along longitudinal direction, Time before gunite concrete, the ability that steelframe bears country rock load are weaker, it is necessary to which gunite concrete rear can be carried out down Procedure will extend the duration in this way, reduce support construction efficiency.

With the development of element precast mounting technology, be increasingly becoming must for the prefabrication and assembly construction of supporting construction in constructing tunnel It so, is the major measure that construction quality can be provided He build speed, reduce cost.It is exactly to assemble that shield method, which builds Tunnel Engineering, The Typical Representative of formula liner supporting, but due to shield method tunnel construction higher cost, so current mining method construction tunnel is still Sizable ratio is so accounted for, but it is less for the precast assembly technical research of Tunneling by mining method supporting construction.Mining Method at present The most commonly used is the Composite Supporting System being made of gunite concrete, anchor pole, steel arch-shelf etc., common steel arch-shelf tools for tunnel support There are biggish supporting intensity and rigidity, can enhance preliminary bracing structural capacity, but the longitudinally connected reinforcing bar of traditional steel arch-shelf And lock foot and steelframe are all made of welded connecting, speed of application is slow, does not meet the requirement of " the early closing " of constructing tunnel, scene overhead welding Working space is narrow, and quality can be to guarantee, although moreover, section-steel support technology maturation, it is easy to happen due to lateral Rigidity is low and weak axis distortion unstability occurs.Under the premise of meeting safe and reliable, current transit tunnel shield segment assembling is used for reference Technology researches and develops a kind of precast splice type supporting construction for reducing each process alternately operating time, improves construction efficiency, it appears ten Divide necessity.

For space grid structure, as a kind of Spacial Frame Structures, there is three-dimensional loading characteristic, can bear each The effect in direction, and grid structure is generally high order statically indeterminate structure, if a bar partial failure, only few primary indeterminate time Number, internal force can be readjusted, and total does not fail generally, safety stock with higher.Due to its good integrity, stablize Property it is good, space stiffness is big, can effectively bear non-symmetrical load, load and dynamic load, and have preferable anti-seismic performance.Its Space grid structure have been widely used for gymnasium, cinema, show room, Waiting Lounge, Stadium canopy, hangar, The roof system of the buildings such as two-way Large Column Spacing workshop.But to intersect at the rod piece quantity on node more for space grid structure, production peace Dress is compared with planar structure complexity, along with the particularity of tunnel support structure, the limitation of construction space and tunnel support for The restriction of calculating and the requirement of its bearing capacity, there is no space grid structure is applied in constructing tunnel at present.

Summary of the invention

The present invention is directed to the long problem with bearing capacity deficiency of traditional supporting type construction time, and the present invention proposes a kind of suitable For the prefabricated assembled space grid structure and its construction method of tunnel support, which gives full play to space net rack knot The construction convenience of the good stress performance of structure and quick assembled type can guarantee safety for tunnel engineering, improve construction efficiency.

A kind of prefabricated assembled space grid structure for tunnel support provided by the invention, it is characterised in that: described Prefabricated assembled space net rack supporting construction includes at least two blocks prefabricated rack support units, and the two of every block of rack support unit End is respectively equipped with the connecting elements connecting with adjacent rack support unit, and at least two pieces of rack support unit head and the tail pass through connection structure Part connects Formation cross-section closing supporting construction identical with supporting tunnel cross-section shape；Every block of rack support unit be by winding up The lattice support structure of bar, lower boom and web member composition, what top boom formation rack support unit was contacted with tunnel inner wall meets Native wire side, lower boom form the back soil wire side of rack support unit, and web member is connected between top boom and lower boom, and is being winded up It is separated to form multiple grid cells between bar and lower boom, is equipped with metal mesh in the native wire side of meeting of every block of rack support unit.

The present invention preferably technical solution: it is triangle that the grid cell of the rack support unit, which meets native face and carries on the back native face, Shape, square, rectangle, pentagon or hexagon, facade are triangle.

The present invention preferably technical solution: the rack support unit is by multiple triangular pyramids or multiple rectangular pyramids or multiple The grid type support frame of hexagonal pyramid composition.

The present invention preferably technical solution: the top boom and lower boom of the rack support unit are by steel pipe, fashioned iron, steel Any one or a few rod piece in muscle, concrete filled steel tube passes through welding or the arc for being directly bent or being formed by connecting by connector The shape body of rod；And web member is connected by welding or connector between top boom and lower boom and forms arch-shaped space truss structure, the abdomen Bar is steel pipe, fashioned iron, reinforcing bar, any one or a few rod piece in concrete filled steel tube.

The present invention preferably technical solution: the connecting elements be the joggle connector being mutually matched or sleeve connector or Bayonet connection or grafting or welded connections, the first connector and the second connector difference that each connecting elements is mutually matched The docking site of two neighboring rack support unit, and the connecting elements at the both ends of each rack support unit are set It is mutually matched；At least two rack support units pass through the first connector and the splicing of the second connector or welding or splicing and welding Combined mode connects into section annular identical with supporting tunnel cross sectional shape, rectangle, the shape of a hoof or polygon closed branch Protection structure.

A kind of construction method of prefabricated assembled space grid structure for tunnel support provided by the invention, feature It is, including the prefabricated assembled space net rack supporting construction at least two ring claim 1 to 5 any one, specifically applies Steps are as follows for work:

(1) the parameters setting value and tunnel model of tunnel support structure are obtained；And according to the parameter item setting value The load load of the tunnel support structure and the elasticity modulus of equivalent space shell are calculated with tunnel model；By the load lotus Load and input of the elasticity modulus as finite element algorithm, calculate the interior force parameter of the tunnel support structure, according to described Interior force parameter verifies the safety of the tunnel support structure, obtains corresponding verification result, is finally tied according to the verifying Fruit adjusts the value of the parameter item, obtains the construction parameter value of final tunnel support structure；

(2) according to the construction parameter value of the tunnel support structure calculated in step (1), determine that every ring is prefabricated assembled The segmentation of space net rack supporting construction, and select suitable rod piece according to segmentation situation in factory or the every prefabricated dress of ring of field fabrication The connector of monolithic rack support unit and rack support unit with formula space net rack supporting construction；

(3) after tunnel excavation, tunnel is formed in the prefabricated monolithic rack support unit of the excavation section quick-assembling completed Road supporting close ring, the connector that adjacent two blocks of rack support units directly pass through its end quickly connect, and connector includes The joggle connector or sleeve connector or bayonet connection or disk being mutually matched buckle connection or connector, connector according to The end of rack support unit is welded on after rack support unit is directly prefabricated；

(4) continue tunneling, and in the assembled next prefabricated assembled space net rack supporting construction of ring of excavation section, adjacent two Longitudinally connected bar splicing can be used in annular space rack supporting construction；

(5) according to engineering practice, after the assembly for completing multi-ring network frame member, fill-before-fire or casting concrete form branch Protection structure.

The present invention preferably technical solution: the parameter of tunnel support structure includes monolithic prefabrication and assembly construction in the step (1) Longitudinal supporting length of formula space net rack supporting construction, the longitudinal cross-section body of rod radical of every linear meter(lin.m.) tunnel support structure, initial stage branch The thickness of shield, the material thickness of the body of rod, the diameter of connector, the circumferential spacing of connector, rod piece and the material of fitting, bar repeatedly Whole parameters or any several parameters in the geometric dimension of part and connector.

The present invention preferably technical solution: the load load packet of the tunnel support structure calculated in the step (1) Include the gravity load of tunnel support structure and the external load of tunnel support structure；

Wherein, 1. the gravity load f of the tunnel support structure is calculated using formula:

F=γ₁bh₁；①

Formula 1. in, γ₁Indicate the concrete severe of the tunnel support structure, b indicates computing unit longitudinal width, h₁It indicates The thickness of the tunnel support structure；

The external load of the tunnel support structure includes the stratum drag and tunnel support knot that tunnel support structure is born The calculating of at least one in the pressure from surrounding rock that structure is born；Wherein, the pressure from surrounding rock that tunnel support structure is born includes tunnel The vertical well-distributed pressure of the country rock that road supporting construction is born and horizontal well-distributed pressure；

After the pressure from surrounding rock that tunnel support structure is born calculates completion, the country rock pressure is adjusted according to load factor Power, wherein the load factor is the ratio of payload values and maxium load value that tentative calculation passes through.

The present invention preferably technical solution: the stratum drag calculating process that the tunnel support structure is born is as follows:

(1) Winkler's assumption algorithm is used, the stratum resistance coefficient of the tunnel model is calculated；

(2) by rigid bar method, it is anti-that the stratum that the tunnel support structure is born is calculated according to the stratum resistance coefficient Power.

The present invention preferably technical solution:

In the case where the tunnel model is deep tunnel:

2. the vertical well-distributed pressure q of the country rock that the tunnel support structure is born is calculated using following formula,

Q=γ₂h_q ②

Formula 2. in, h_q=first constant × 2^S-1W, w=second constant+i (B- three constant)；γ₂Indicate country rock weight Degree, h_qIt indicates that country rock collapses and encircles computed altitude, S indicates that Grades of Surrounding Rock, w indicate that widths affect coefficient, B indicate that tunnel excavation is wide Degree, i indicate every pressure from surrounding rock gradient for increasing unit length；

The horizontal even cloth pressure of the country rock that the tunnel support structure is born is held by the tunnel support structure of above-mentioned calculating The product of the country rock received vertical well-distributed pressure q and particular factor；Wherein, the value of the particular factor is related to Grades of Surrounding Rock.

The present invention preferably technical solution:

In the case where the tunnel model is shallow tunnel:

3. the vertical well-distributed pressure q of the country rock that the tunnel support structure is born is calculated using formula,

Wherein,

γ₂Indicate country rock severe, h₂Indicate the height of tunnel top from the ground, λ indicates that lateral pressure coefficient, θ indicate tunnel top The angle of friction of portion two sides, B indicate that tunnel excavation width, β indicate angle of rupture when maximum thrust,Indicate that country rock calculates friction Angle；

The horizontal even cloth pressure e of the country rock that the tunnel support structure is born_iIt is 4. calculated using formula,

e_i=γ₂h_iλ ④

Wherein, γ₂Indicate country rock severe, h_iIndicate the distance on outside arbitrary point to ground in tunnel, λ indicates lateral pressure system Number.

The parameter of tunnel support structure includes the vertical of the prefabricated assembled space net rack supporting construction of monolithic in the step (1) Material to supporting length, the longitudinal cross-section body of rod radical of every linear meter(lin.m.) tunnel support structure, the thickness of preliminary bracing, the body of rod is thick Degree, the circumferential spacing of the diameter of connector, connector, rod piece and the geometric dimension of the material of fitting, rod piece and connector repeatedly In whole parameters or any several parameters, the wherein type of attachment of rod piece, bar material, geometric dimension (length, diameter or thickness Degree etc.) material and geometric dimension of connecting elements

Beneficial effects of the present invention:

(1) supporting construction in the present invention utilizes and gives full play to the good stress performance of space grid structure and quick assembling Traditional steel arch-shelf etc. " line supporting " is changed to " face supporting " by the construction convenience of formula, promotes tunnel safety and stability；

(2) the prefabricated assembled space net rack supporting construction in the present invention is not necessarily to gunite concrete, certainly by grid structure Body can undertake whole tunnel loads, assembled quick, and can carry out injection coagulation after carrying out multiple excavations and assembled recycle Soil reduces working procedure alternating, improves construction efficiency, ensured safety for tunnel engineering, is particularly suitable for complicated geology, becomes Shape control is stringent to wait tunnel excavations section；

(3) the space net rack supporting construction in the present invention is to be connected by multi-disc arc supporting construction by quick-assembling connector It forms, arc supporting construction can directly be processed in advance according to parameters for tunnel or scene processing, and then quick-assembling forms one Whole ring structure avoids the problems such as construction tunnel caused by welding is slow, quality can be difficult to ensure, improves construction effect Rate；

(4) the space net rack supporting construction in the present invention is made of multiple pyramidal structures, each pyramidal structure wherein one Side is planar, the other side be it is dotted, connected between face and point by more pull rods, under joint load effect, each rod piece is main Axial pulling force and pressure are born, the intensity of material can be given full play to, multiple pyramid components are regular to be combined, whole Body is good, and stability is good, and space stiffness is big, can effectively bear non-symmetrical load, load and dynamic load, and has preferable Anti-seismic performance；

(5) in the construction process in advance for the bearing capacity of the tunnel needs before gunite concrete to rack in the present invention The parameter of supporting construction carries out calculating design, guarantees that the supporting construction designed can satisfy construction safety, it is ensured that prefabricated branch Protection structure is just capable of providing larger bearing capacity before gunite concrete, it can be achieved that mixed without injection in certain job area Solidifying soil can carry out next procedure, improve construction efficiency.

(6) the space grid structure combination in the present invention is regular, and great deal of nodes is identical with shape, the size of rod piece, and And rod piece and node specification are less, easy to produce, product quality is high.

The present invention can complete the assembly of multi-ring network frame member according to the actual situation and carry out gunite concrete again, the structure and apply Support unit batch production in work method is prefabricated, easy to produce, quality controllable, and on-site consolidation construction is convenient, and mixed without injection Solidifying soil can undertake whole tunnel loads by grid structure itself, and greatly the alt time of reduction each process is, it can be achieved that tunnel The rapid construction of road supporting improves construction efficiency.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of prefabricated assembled space net rack supporting construction of the invention；

Fig. 2 is the structural schematic diagram of rack support unit in the present invention；

Fig. 3 is the splicing schematic diagram of rack support unit in the present invention；

The structural schematic diagram of different connecting elements in Fig. 4 a to Fig. 4 e present invention；

Fig. 5 is the floor map of rack support unit of the invention；

Fig. 6 is the diagrammatic cross-section of rack support unit of the invention；

Fig. 7 a to 7c is the structural schematic diagram of the different grid cells of rack support unit；

Fig. 8 a to Fig. 8 c is the spelling schematic diagram of Fig. 7 a grid cell into 7c respectively.

Fig. 9 is rack framework supporting width and apart from schematic diagram；

Figure 10 is Construction State schematic diagram of the invention.

In figure: 1-rack support unit, 2-to supporting tunnel, 3-top booms, 4-lower booms, 5-web members, 6-gold Belong to net, 7-connecting elements, the first connector of 7-1-, the second connector of 7-2-, 8-concrete lining-ups, a-rack supporting structure The width of part, the spacing of the adjacent two looped networks frame supporting construction of b-.

Specific embodiment

Present invention will be further explained below with reference to the attached drawings and examples.Attached drawing 1 is the attached drawing of embodiment to Fig. 8, It is drawn by the way of simplified, is only used for purpose that is clear, compactly illustrating the embodiment of the present invention.Below to exhibition in the accompanying drawings Existing technical solution is the concrete scheme of the embodiment of the present invention, it is not intended that limits the range of claimed invention.Base Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its His embodiment, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that, term " on ", "lower", "inner", "outside", "left", "right" etc. indicate Orientation or positional relationship be based on the orientation or positional relationship shown in the drawings or the invention product using when usually put Orientation or positional relationship or the orientation or positional relationship that usually understands of those skilled in the art, be merely for convenience of retouching It states the present invention and simplifies description, rather than the equipment of indication or suggestion meaning or element must have a particular orientation, with specific Orientation construction and operation, therefore be not considered as limiting the invention.

As shown in Figures 1 to 6, a kind of prefabricated assembled space net rack knot for tunnel support that the invention patent provides Structure, specifically includes at least two blocks prefabricated rack support units 1, the both ends of every block of rack support unit 1 be respectively equipped with it is adjacent The connecting elements 7 that rack support unit 1 connects, the connecting elements 7 is joggle connector (such as Fig. 4 a and the figure being mutually matched 4b) or sleeve connector or bayonet connection (such as Fig. 4 c is buckled with Fig. 4 d) or connector or disk and is connected (such as Fig. 4 e), each The the first connector 7-1 and the second connector 7-2 that connecting elements 7 is mutually matched are separately positioned on two neighboring rack support unit 1 docking site, and the connecting elements 7 at the both ends of each rack support unit 1 is also mutually matched；At least two racks It is identical with 2 cross sectional shape of supporting tunnel that support unit 1 by the first connector 7-1 and the second connector 7-2 is spliced into section Annular, rectangle, the shape of a hoof or polygon closed supporting construction.Prefabricated rack support unit 1 is according to tunnel cross-section shape point Section is prefabricated, compatible with tunnel cross-section shape, does not limit the concrete shape being assembled into.

Every block of rack support unit 1 in the prefabricated assembled space net rack supporting construction of tunnel support provided in the present invention For the lattice support structure being made of top boom 3, lower boom 4 and web member 5, top boom 3 forms rack support unit 1 and tunnel Native wire side is met in the contact of 6 inner wall of road, and lower boom 4 forms the back soil wire side of rack support unit 1, web member 5 be connected to top boom 3 with Between lower boom 4, and multiple grid cells are separated to form between top boom 3 and lower boom 4, in every block of rack support unit 1 Meet native wire side equipped with metal mesh 6.Wherein, the native wire side of meeting of rack support unit 1 is respectively formed entire bracket with native wire side is carried on the back Outer ring structure and inner ring structure can guarantee so outer since the body of rod on outer ring structure and inner ring structure is uniformly arranged Uniform force on coil structures and inner ring structure.

The meet native face and the native face of back of 1 grid cell of rack support unit are triangle, square, rectangle, five in the present invention Side shape or hexagon, facade are triangle, it is ensured that it is met native wire side and carries on the back what the rod piece in native wire side was surrounded by web member 5 Minimum shape unit is triangle, can further improve the support strength of prefabricated components by triangle rock-steady structure.The net The top boom 3 and lower boom 4 of frame support unit 1 are by any one or a few in steel pipe, fashioned iron, reinforcing bar, concrete filled steel tube Rod piece passes through welding or the arc body of rod for being directly bent or being formed by connecting by connector；And between top boom 3 and lower boom 4 Web member 5 is connected by welding or connector and forms arch-shaped space truss structure, and the web member 5 is steel pipe, fashioned iron, reinforcing bar, steel tube concrete Any one or a few rod piece in soil.

Rack support unit 1 provided in the present invention is made of multiple triangular pyramids or multiple rectangular pyramids or multiple hexagonal pyramids Grid type support frame, for triangular pyramid as shown in Fig. 7 a and 8a, the triangle bottom surface of two neighboring triangular pyramid is linked as a curved surface, should Curved surface is the native face of meeting of rack support unit 1, forms three support rods, that is, rack support unit 1 of triangular pyramid triangle bottom surface The cone of top boom, two neighboring triangular pyramid is linked together by interior chord member 4, and three supports of triangular pyramid cone are formed after connection Bar, that is, rack support unit 1 web member.Its rectangular pyramid is as illustrated in figures 7 b and 8b, the same with triangular pyramid, and quadrangular bottom is linked as One curved surface, the plane are the native face of meeting of rack support unit 1, form four support rod, that is, racks of rectangular pyramid quadrangle bottom surface The cone of the top boom of support unit 1, two neighboring rectangular pyramid is linked together by interior chord member 4, and rectangular pyramid cone is formed after connection Four support rods, that is, rack support unit 1 web member of body.For hexagonal pyramid as shown in Fig. 7 c and 8c, hexagon bottom surface is linked as one Curved surface, the curved surface are the native face of meeting of rack support unit 1, form six roots of sensation support rod, that is, rack supporting of hexagonal pyramid hexagonal bottom surface The cone of the top boom of component 1, two neighboring hexagonal pyramid is linked together by interior chord member 4, and hexagonal pyramid cone is formed after connection Six roots of sensation support rod, that is, rack support unit 1 web member.

Below with reference to embodiment, the present invention is further described, and the middle parameter value of the embodiment of the present invention determines that scheme calculating can To be realized using various computer languages, for example, object oriented program language Java and literal translation formula scripting language JavaScript etc..