CN115821972A - Assembled rock anchor rod foundation of power transmission line and construction method - Google Patents

Abstract

The invention discloses an assembled rock anchor rod foundation of a power transmission line and a construction method, wherein the assembled tower foundation and the rock anchor rod foundation are optimally combined to form the assembled rock anchor rod foundation, a bearing platform and a main column part are divided into a plurality of prefabricated components according to a certain size, a bearing platform bottom plate, a side plate, a main column and the like are prefabricated in advance through a factory, and the prefabricated bearing platform prefabricated components, the main column prefabricated components and the like are transported to a construction site for assembly, so that the construction quality of the foundation is improved, the on-site concrete curing time and the material consumption of the foundation are reduced, the construction period is shortened, the construction cost of the tower foundation is reduced, the environmental problems in the construction process are reduced, the use range of the anchor rod foundation and the assembled foundation is expanded, the mechanical tower construction of power transmission and transformation engineering is facilitated to be pushed, and the assembled tower foundation has good social and economic benefits and engineering application values.

Description

An assembled rock bolt foundation for transmission lines and its construction method

technical field

The invention relates to the technical field of transmission tower foundations, in particular to an assembled rock bolt foundation for transmission lines and a construction method.

Background technique

The foundation of transmission lines is different from the foundation of general construction projects. Due to the long distance of power transmission lines, wide crossing area, complex terrain and geological conditions along the way, and great differences in the physical and mechanical properties of foundation soil, and the tower foundation needs to consider uplift, downpressure and horizontal thrust. , so the performance requirements for the tower foundation are higher. The rock bolt foundation is drilled with a bolt machine, and then the concrete or mortar and the bolt are poured into the rock hole. After the grouting is solidified, the bolt, concrete and rock form a whole to resist various loads from the tower. . The rock bolt foundation makes full use of the shear strength of the rock itself, has good pull-out performance, can reduce the amount of foundation materials, has less spoil, less excavation of soil and rock, and reduces the impact on the original landform of the construction area. Destruction is conducive to the protection of vegetation and ecological environment. At present, most of the rock bolt foundation and construction methods still adopt the method of anchor bolt grouting, bearing cap, and main column cast-in-place. On-site maintenance of concrete is easily affected by the construction environment, resulting in concrete quality that does not meet the expected standards; in addition, the use of cast-in-place concrete for the foundation cap will increase the manual workload and construction procedures on the construction site, which is not conducive to promoting the mechanization of power transmission and transformation projects construction.

Contents of the invention

The purpose of the present invention is to make up for the deficiencies in the existing rock bolt foundation, provide a power transmission line assembled rock bolt foundation and a construction method, solve the problem of low construction efficiency of the rock bolt foundation, difficulties in transporting tower foundations and raw materials, and on-site concrete maintenance. Long time and other issues.

In order to achieve the above object, the technical solution adopted by the present invention is: a power transmission line assembled rock bolt foundation, including a prefabricated main column, a prefabricated bottom plate, a prefabricated side plate, connecting steel plates and bolts; the bolts are several, Placed vertically in the rock formation; the prefabricated bottom plate has several holes through the upper and lower sides, the anchor rod can pass through the holes to form a whole with the prefabricated bottom plate, a circle of grooves is left on the top of the prefabricated bottom plate, and the prefabricated side The board is fixed in the groove of the prefabricated bottom plate through the mortise and tenon structure; the prefabricated main column is vertically arranged at the center of the prefabricated bottom plate, and anchor bolts and longitudinal ribs are pre-embedded in the prefabricated main column; In the cavity formed by the prefabricated bottom plate and the prefabricated side plate, the pre-embedded anchor bolts, longitudinal reinforcement, anchor rod and anchor reinforcement and the connecting steel plate are fixed by nuts.

Further, the anchor rod is fixed in the rock formation by pouring concrete or cement mortar and forms an integral body with the prefabricated bottom plate.

Furthermore, several lifting rings are preset on the top of the prefabricated floor, which is convenient for transportation and installation in the project, and the upper and lower layers of steel mesh are pre-embedded inside to ensure the bending bearing capacity of the prefabricated floor.

Further, the prefabricated main column is preset with circular hoops to ensure the shear bearing capacity of the prefabricated main column.

Further, the connecting steel plate is provided with the same number of reserved holes at positions corresponding to the pre-embedded anchor bolts, longitudinal reinforcement and the anchor reinforcement in the prefabricated main column, and the anchor bolts, longitudinal reinforcement and anchor reinforcement The prefabricated main column, the connecting steel plate and the anchor rod are integrated by passing through the reserved hole and connecting the connecting steel plate with nuts.

Further, a washer is provided between the connecting steel plate and the nut to increase the force-bearing area, tighten the connection between the connecting steel plate and the anchor bolts, longitudinal bars, and anchor bars, and avoid stress concentration.

Further, the cavity formed by the prefabricated bottom slab and the prefabricated side slab is filled by pouring micro-expansion fine stone concrete grout, and the concrete grout has a horizontal plane on the same plane as the top surface of the prefabricated side slab and the bottom surface of the prefabricated main column, so that the prefabricated The main column, the prefabricated base plate, the prefabricated side plate, the connecting steel plate and the anchor rod form a whole.

Further, a layer of reinforcement mesh is placed between the prefabricated main column and the connecting steel plate to prevent cracking of the concrete and improve the overall rigidity at the same time.

A construction method for an assembled rock bolt foundation of a power transmission line, comprising the following steps: (a) component prefabrication, (b) overall assembly; wherein,

(a) Component prefabrication: According to actual engineering requirements, main columns, bottom plates, side plates and connecting steel plates of different sizes are prefabricated in the factory, and the anchor bolts and longitudinal reinforcements are pre-embedded inside the main columns;

(b) Overall assembly: pass the anchor bolts and anchor bars and the anchor bolts and longitudinal bars of the prefabricated main column through the corresponding holes on the connecting steel plates, fix them with nuts, and then hoist the main column so that the anchor bars pass through the reserved holes in the bottom plate, and finally The prefabricated side panels are hoisted in the grooves of the prefabricated floor, and the gaps are filled with micro-expansion fine stone concrete grouting.

Compared with the prior art, the present invention has the following advantages and beneficial effects:

(1) Good mechanical performance: the overall force transmission route of the foundation is clear and clear, the connections of each prefabricated component are reliable, all steel components are effectively wrapped by concrete, and have good durability; promote.

(2) Easy to transport: both the cap and the main column are composed of prefabricated components processed in the factory. Compared with the traditional cast-in-place cap and main column, only the prefabricated blocks need to be transported to the site for assembly, without material waste. The moderate weight reduces the burden of transportation in mountainous areas.

(3) Improve engineering efficiency: the cap and the main column are composed of prefabricated components. Compared with the traditional rock bolt foundation, the cap and the main column can be prefabricated in the factory before the construction starts, avoiding the It saves pouring and on-site maintenance time; at the same time, during the prefabrication process, hoisting rings can be added to the prefabricated components, which is convenient for later hoisting and assembly, reduces construction time, and further improves engineering efficiency.

(4) Protect the environment: Compared with the traditional foundation, the prefabricated foundation can realize the transfer of the main links of construction, complete the production of assembly parts through the factory, and reduce construction waste such as remaining concrete, scrap metal materials, packaging materials, etc. The production of raw materials reduces the impact on the environment during the transportation, stacking and processing of raw materials on the construction site. At the same time, for the rock bolt foundation, the rock bolt machine is used to drill holes. The technology is advanced, the construction base is small, and the shear strength of the rock itself is fully utilized. , has good pull-out resistance, thereby reducing the loss of basic materials, less waste slag, and less earth and stone cubicles, which reduces the damage to the original landform of mountainous areas, and is conducive to the protection of vegetation and ecological environment.

(5) Suitable for mechanized construction of power transmission and transformation projects: prefabricated is a convenient way to take the road of mechanized construction. Compared with traditional construction methods, prefabricated foundations can be assembled by the factory on the premise of satisfying the quality and performance of the tower foundation. Design and processing, with a relatively complete standard design system; at the same time, according to the actual construction needs, the assembly parts can be installed and modified in the factory to match the corresponding construction equipment, so as to facilitate the promotion of mechanized construction of power transmission and transformation projects.

Description of drawings

Fig. 1 is the elevation structure schematic diagram of the present invention;

Fig. 2 and Fig. 3 are respectively the front view and the sectional view of the prefabricated main column in the present invention;

Fig. 4 and Fig. 5 are respectively the front view and the sectional view of the prefabricated floor in the present invention;

Fig. 6 and Fig. 7 are respectively the front view and the sectional view of the prefabricated side panel in the present invention;

Fig. 8 is the front view of connecting steel plate among the present invention;

Fig. 9 is the front view of anchor rod among the present invention;

Fig. 10 is a connection structure diagram between the longitudinal reinforcement or the anchor reinforcement and the connecting steel plate in the present invention;

Fig. 11 is a connection structure diagram between anchor bolts and connecting steel plates in the present invention.

In the figure: 01. Prefabricated main column; 11. Main column body; 12. Anchor bolts; 13. Longitudinal reinforcement; 14. Stirrup; 02. Prefabricated floor; Plate; 04. Connecting steel plate; 41. The first reserved hole; 42. The second reserved hole; 43. The third reserved hole; 05. Anchor rod; 51. Concrete in the anchoring section; Nut; 07, double nut.

Detailed ways

The present invention will be described in further detail below in conjunction with the embodiments in the accompanying drawings, but this does not constitute any limitation to the present invention.

As shown in Figure 1, the above and below directions and relative positions all refer to the directions and relative positions in the figure, and the vertical direction is the vertical direction arranged in the figure. The horizontal direction is perpendicular to the vertical direction. The prefabricated rock bolt foundation of the transmission line in this embodiment includes a prefabricated main column 01 , a prefabricated bottom plate 02 , a prefabricated side plate 03 , a connecting steel plate 04 and an anchor rod 05 .

As shown in Figures 2 and 3, the vertical section of the prefabricated main column 01 is circular, and the prefabricated main column 01 includes a main column body 11, anchor bolts 12, longitudinal ribs 13 and stirrups 14. The bolt 12 is pre-buried inside the main column body 11 by the factory in advance, and its length exceeds the main column body 11. The top is used to connect with the tower foot plate, and the bottom is connected to the connecting steel plate 04 through the adjustment nut 06 and the double nut 07. The connection structure As shown in Figure 11, the upper part of the connecting steel plate 04 is the adjusting nut 06, and the lower part is the double nut 07, and a backing plate is provided between the nut and the connecting steel plate 04; the longitudinal rib 13 is pre-embedded in the main body 11, Its bottom is exposed outside the main column body 11, and is connected to the connecting steel plate 04 through the adjusting nut 06 and the double nut 07. 06. There is a backing plate between the nut and the connecting steel plate 04; the stirrup 14 is pre-embedded inside the main column body 11 to ensure the accurate spatial position of the longitudinal rib 13 and strengthen the prefabricated main column 01 of force strength.

As shown in Fig. 1, Fig. 4 and Fig. 5, the prefabricated bottom plate 02 is square, and several lifting rings 21 are preset on the top, which is convenient for transportation and installation in the project, and two layers of steel mesh are embedded inside the prefabricated bottom plate 02 22 to ensure the quality of the prefabricated bottom plate, a circle of grooves for installing the prefabricated side plate 03 is left on the top of the prefabricated bottom plate 02, and several holes through the upper and lower sides are left on the prefabricated bottom plate 02 for the passage of anchor rods 05 ( as shown in Figure 9).

As shown in Fig. 1 , Fig. 6 and Fig. 7, the prefabricated side panels 03 are installed in the grooves around the prefabricated bottom panel 02, and are connected with the prefabricated bottom panel 02 through a mortise and tenon structure.

As shown in Fig. 1 and Fig. 8, the connecting steel plate 04 is a square or round steel plate, and the connecting steel plate 04 is placed in the cavity formed by the prefabricated bottom plate 02 and the prefabricated side plate 03, corresponding to the prefabricated main column 01 The same number of first reserved holes 41 and second reserved holes 42 are set at the positions of the pre-embedded anchor bolts 12 and longitudinal reinforcements 13, and the same number of third reserved holes are set at the positions corresponding to the anchor bar 05. The reserved hole 43 is connected to the connecting steel plate 04 through the pre-embedded anchor bolt 12 and the longitudinal reinforcement 13 through the first reserved hole 41 and the second reserved hole 42, and is connected to the connecting steel plate 04 through the third reserved hole 43 04 connection, so that the prefabricated main column 01, the connecting steel plate 04 and the anchor rod 05 are connected to each other.

As shown in Fig. 1 and Fig. 9, there are several anchor rods 05, which are vertically placed in the rock formation. The anchor rods 05 include anchoring section concrete (or cement mortar) 51 and anchor bars 52 arranged therein. 05 is integrated with the prefabricated bottom plate 02 through the concrete or cement mortar of the anchoring section, and each hole of the prefabricated bottom plate 02 corresponds to an anchor rod 05, and the upper part of the anchor bar 52 is exposed to the prefabricated bottom plate 02 through the hole of the prefabricated bottom plate 02 In the cavity formed by the prefabricated side plate 03, the top is connected with the connecting steel plate 04 through the adjusting nut 06 and the double nut 07. Nut 06, backing plate is all provided between nut and connecting steel plate 04.

As shown in Figure 1, the cavity formed by the prefabricated bottom plate 02 and the prefabricated side plate 03 is filled with micro-expanded fine stone concrete grouting, and the prefabricated main column 01, the prefabricated bottom plate 02, the prefabricated side plate 03, and the connecting steel plate 04 are formed by concrete grouting Integrate with the anchor rod 05 into a stable overall structure, improve the stability and support strength, and protect the connecting steel plate from environmental corrosion. A layer of steel mesh is placed between the prefabricated main column 01 and the connecting steel plate 04 before grouting to prevent concrete cracking while increasing the strength of concrete.

Claims (8)

1. The utility model provides a transmission line assembled rock stock basis, includes prefabricated king post, prefabricated bottom plate, prefabricated curb plate, connecting plate and stock, its characterized in that: the anchor rods are vertically placed in the rock stratum and comprise anchoring section concrete or cement mortar and anchor bars arranged in the anchoring section concrete or cement mortar; the prefabricated bottom plate is provided with a plurality of holes which penetrate through the prefabricated bottom plate up and down, the anchor rod can penetrate through the holes to form a whole with the prefabricated bottom plate, the top of the prefabricated bottom plate is provided with a circle of groove, and the prefabricated side plate is fixed in the groove of the prefabricated bottom plate through a tenon-and-mortise structure; the prefabricated main column is vertically arranged at the center of the prefabricated bottom plate, and foundation bolts and longitudinal bars are pre-embedded in the prefabricated main column; the connecting steel plate is placed in a cavity formed by the prefabricated bottom plate and the prefabricated side plates, and the foundation bolts, the longitudinal ribs and the anchor ribs in the anchor rods in the prefabricated main columns are fixed with the connecting steel plate through nuts.

2. The power transmission line fabricated rock bolt foundation of claim 1, wherein: the anchor rod is fixed in the rock stratum through pouring concrete or cement mortar and forms a whole with the prefabricated bottom plate.

3. The power transmission line fabricated rock bolt foundation of claim 1, wherein: a plurality of rings are preset at the top of the prefabricated bottom plate, and an upper layer of steel mesh and a lower layer of steel mesh are embedded inside the prefabricated bottom plate.

4. The power transmission line fabricated rock bolt foundation of claim 1, wherein: the connecting steel plate is corresponding to pre-buried rag bolt in the prefabricated king post, indulge the muscle and the position of anchor bar sets up the preformed hole of the same quantity, rag bolt, indulge muscle and anchor bar pass the preformed hole and pass through the nut with connecting steel plate and be connected for prefabricated king post, connecting steel plate and stock become whole.

5. The power transmission line fabricated rock bolt foundation of claim 4, wherein: and a gasket is arranged between the connecting steel plate and the nut.

6. The power transmission line fabricated rock bolt foundation of claim 1, wherein: and a cavity formed by the prefabricated bottom plate and the prefabricated side plates is filled by pouring micro-expansion fine stone concrete grout, and the concrete grout has a horizontal plane which is positioned on the same plane with the top surfaces of the prefabricated side plates and the bottom surfaces of the prefabricated main columns.

7. The power transmission line fabricated rock bolt foundation of claim 6, wherein: a layer of steel bar net is placed between the prefabricated main column and the connecting steel plate to prevent concrete from cracking.

8. A construction method of the fabricated rock bolt foundation of the power transmission line according to any one of claims 1 to 7, characterized in that: the method comprises the following steps: the method comprises the following steps of (a) prefabricating parts and (b) integrally assembling; wherein,

(a) Prefabricating parts: according to actual engineering requirements, prefabricating main columns, bottom plates, side plates and connecting steel plates with different sizes in a factory, and embedding the foundation bolts and the longitudinal bars in the main columns;

(b) And (3) integral assembly: and (3) penetrating anchor bars of the anchor rods and foundation bolts and longitudinal bars of the prefabricated main columns through corresponding holes in the connecting steel plates, fixing the anchor bars and the foundation bolts and the longitudinal bars through nuts, hoisting the main columns, enabling the anchor rods to penetrate through reserved holes in the bottom plate, hoisting the prefabricated side plates in grooves of the prefabricated bottom plate, and filling gaps with micro-expansion fine aggregate concrete grouting.

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