A kind of composite foundation combining anchor rods with excavation and job practices thereof
Technical field
The present invention relates to the foundation construction technical field of transmission line of electricity, relate in particular to a kind of composite foundation combining anchor rods with excavation and job practices thereof.
Background technology
Often run in the transmission line of electricity basis that shallow-layer is arranged is soil layer; and the depths is the geological conditions of rock stratum slightly; the base form that adopts before under this geological conditions is generally basis (the big slab foundation of excavation backfill class; footing foundation) or digging foundation; when load of roadway is big; the foundation bed degree of depth need surpass the rock stratum end face; the bearing capacity on basis could satisfy the load of roadway requirement; like this because digging foundation can not be drawn the rock stratum digs and can't adopt; and adopt big slab foundation and footing foundation will carry out methods such as explosion to the rock stratum so that the excavation of rock stratum part; so just bring very big difficulty to construction; huge earthwork excavated volume is arranged simultaneously; destroy undisturbed soil, be unfavorable for protecting environment.
Summary of the invention
In order to overcome defective of the prior art, the object of the present invention is to provide a kind of explosion rock stratum that need not, be convenient to construction, reduce the composite foundation combining anchor rods with excavation of earthwork excavated volume, mainly be applied in the electric power line pole tower basis.
Another object of the present invention is to provide a kind of job practices of composite foundation combining anchor rods with excavation.
For this reason, the present invention proposes a kind of composite foundation combining anchor rods with excavation, comprise digging foundation and anchor pole basis, described anchor pole basis is arranged in the rock stratum on the face of land, it comprises at least one cylindrical or polygonal rock bolt, described rock bolt has anchor pole master muscle and centers on the concrete or the cement mortar of anchor pole master muscle, and described anchor pole master muscle extend in the digging foundation; Described digging foundation is arranged in the soil layer on the face of land, and it is made of arrangement of reinforcement and concrete; Described digging foundation is connected by the anchor pole master muscle that extend in the digging foundation with the anchor pole basis.
Wherein, the described anchor pole master muscle length that extend into digging foundation is more than or equal to 40 times of anchor pole master muscle diameter.
Wherein, described around anchor pole master muscle concrete or the end face of cement mortar extend into the height h of digging foundation more than or equal to 10 centimetres.
Wherein, described digging foundation the cross sectional shape of vertical direction be the infundibulate of back-off or rectangle or on bottom side length trapezoidal in the bottom.
The present invention also provides a kind of job practices of composite foundation combining anchor rods with excavation, and construction process is as follows:
1) pore-forming utilizes jumbolter to get out armature boring in the soil layer on the face of land and rock stratum;
2) after pore-forming finishes, put into and fixing described anchor pole master muscle, make described anchor pole master muscle extend into digging foundation length partly 40 times more than or equal to anchor pole master muscle diameter, pour into described anchor pole then partly around the concrete or the cement mortar of anchor pole master muscle, make describedly to extend into the height of digging foundation part more than or equal to 10 centimetres around the concrete of anchor pole master muscle or the end face of cement mortar;
3) partly draw the foundation ditch that digs out the digging foundation part at the soil layer on the face of land;
4) partly lay and fixing described digging foundation part arrangement of reinforcement, concreting then at digging foundation.
Composite foundation combining anchor rods with excavation of the present invention can be used for that shallow-layer is a soil layer, the depths is the geological conditions of rock stratum slightly, mainly be applied in the electric power line pole tower basis, this composite foundation is united by anchor pole basis and digging foundation and is formed, because the digging foundation bottom surface places the rock stratum end face, therefore when stressed, bear main downforce by digging foundation, digging foundation and anchor pole basis are born uplift force and horizontal force jointly, so just can satisfy the transmission line of electricity load requirement.
Beneficial effect of the present invention is: this composite foundation combining anchor rods with excavation need not the explosion rock stratum, is convenient to construction, reduces earthwork excavated volume, utilizes undisturbed soil, is beneficial to the protection environment.
Description of drawings
Fig. 1 is the big slab foundation of prior art or the structural representation of footing foundation;
Fig. 2 is first kind of organigram of composite foundation combining anchor rods with excavation of the present invention;
Fig. 3 is the schematic flow sheet of composite foundation combining anchor rods with excavation of the present invention and job practices thereof;
Fig. 4 is the concrete structure size schematic diagram of Fig. 2, and wherein Fig. 4-1 is the sectional view of Fig. 2, and Fig. 4-2 is the vertical view of Fig. 2;
Fig. 5 is second kind of organigram of composite foundation combining anchor rods with excavation of the present invention;
Fig. 6 is the third organigram of composite foundation combining anchor rods with excavation of the present invention;
Wherein, the I-soil layer, the II-rock stratum, the 1-digging foundation, 2-anchor pole basis, the 3-rock bolt, 4-anchor pole master muscle, 5-is around the concrete or the cement mortar of anchor pole master muscle, 6-arrangement of reinforcement, 7-concrete, 8-armature boring, the foundation ditch of 9-digging foundation.
The specific embodiment
Below in conjunction with accompanying drawing composite foundation combining anchor rods with excavation of the present invention is described further.
As shown in Figure 2, composite foundation combining anchor rods with excavation of the present invention comprise digging foundation 1 and anchor pole basis 2, described anchor pole basis 2 is arranged in the rock stratum II on the face of land, it comprises at least one cylindrical or polygonal rock bolt 3, this rock bolt 3 has anchor pole master muscle 4 and centers on the concrete or the cement mortar 5 of anchor pole master muscle, and anchor pole master muscle 4 extend in the digging foundation 1; Described digging foundation 1 is arranged in the soil layer I on the face of land, and the bottom surface of its digging foundation 1 places rock stratum II end face, and it is made of arrangement of reinforcement 6 and concrete seven; Described digging foundation 1 is connected by the anchor pole master muscle 4 that extend in the digging foundation with anchor pole basis 2, and digging foundation 1 is the infundibulate of back-off at the cross sectional shape of vertical direction.Shown in Fig. 5-6, digging foundation 1 the cross sectional shape of vertical direction also can be rectangular or the top be longer than following trapezoidal.
As shown in Figure 4, the physical dimension of composite foundation combining anchor rods with excavation of the present invention can adopt following parameter: soil layer I is a loess formation, and the rock stratum II below the soil layer is the gentle breeze rock stratum, and the narrow end diameter in the top of described digging foundation 1 is 0.8m, and length is 1m; The diameter of lower enlarged end is 1.2cm, and length is 0.5m.Top digging foundation 1 is arranged in the thick loess formation of 1.5m.Four rock bolts 3 by arranged in squares are set in the gentle breeze rock stratum, rock bolt 3 spacings are that 40cm, its diameter are 0.15m, it is 6m that anchor pole master muscle 4 adopts HRB335II level screw-thread steel, its length of 36mm diameter, waters to be filled in anchor pole master muscle 4 concrete on every side or the cement mortar of cement mortar 5 employing C20 concrete or M20.The length that anchor pole master muscle enters digging foundation is 1.44m.This composite foundation combining anchor rods with excavation can bear 150 tons uplift force.
Fig. 3 shows the construction schematic diagram on basis of the present invention.Concrete construction process is as follows:
1) pore-forming utilizes jumbolter to get out armature boring in the soil layer on the face of land and rock stratum;
2) after pore-forming finishes, put into and fixing described anchor pole master muscle, make length that described anchor pole master muscle extend into digging foundation 40 times more than or equal to anchor pole master muscle diameter, pour into described anchor pole then partly around the concrete or the cement mortar of anchor pole master muscle, make describedly to extend into the height of digging foundation more than or equal to 10 centimetres around the concrete of anchor pole master muscle or the end face of cement mortar;
3) partly draw the foundation ditch that digs out digging foundation at the soil layer on the face of land;
4) lay and fixing described digging foundation arrangement of reinforcement, concreting then at digging foundation.
In addition, anchor pole of the present invention basis, footing foundation, board-like greatly, digging foundation are known base form, are usually used in the transmission line of electricity basis.
Fig. 5 is second kind of organigram of composite foundation combining anchor rods with excavation of the present invention, and Fig. 6 is the third organigram of composite foundation combining anchor rods with excavation of the present invention.Wherein, described digging foundation the cross sectional shape of vertical direction be the infundibulate of back-off or rectangle or on bottom side length trapezoidal in the bottom.
Invention has been described according to specific exemplary embodiment herein.It will be conspicuous carrying out suitable replacement to one skilled in the art or revise under not departing from the scope of the present invention.Exemplary embodiment only is illustrative, rather than to the restriction of scope of the present invention, scope of the present invention is by appended claim definition.