Power transmission line assembled rock anchor foundation and construction method

Abstract

The application discloses a power transmission line assembled rock anchor rod foundation and a construction method, which optimizes and combines an assembled pole tower foundation and a rock anchor rod foundation to form an assembled rock anchor rod foundation, divides a bearing platform and a main column part into a plurality of prefabricated components according to certain sizes, prefabricates the bearing platform bottom plate, the side plate and the main column in a factory in advance, transports the prefabricated bearing platform prefabricated components and the main column prefabricated components to a construction site for assembly, improves foundation construction quality, reduces on-site concrete maintenance time and material consumption of the pole tower foundation, shortens a construction period, reduces construction cost of the pole tower foundation, reduces environmental problems in the construction process, expands the use range of the anchor rod foundation and the assembled foundation, is beneficial to promoting mechanical construction of power transmission and transformation projects, and has good social and economic benefits and engineering application value.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power transmission tower foundation, and particularly relates to a power transmission line assembled rock anchor foundation and a construction method. BACKGROUND

[0002] The power transmission line foundation is different from the general building engineering foundation. Due to the long distance, wide span area, complex terrain and geological conditions along the way, large difference in physical and mechanical properties of the foundation soil, and the need to consider the uplift, downward pressure and horizontal thrust of the tower foundation, the performance requirement of the tower foundation is higher. The rock anchor foundation adopts the anchor rod drilling, and then the concrete or mortar is grouted into the rock hole together with the anchor rod. After the grouting is solidified, the anchor rod, the concrete and the rock form an integral whole to resist various loads transmitted by the tower. The rock anchor foundation fully utilizes the shear strength of the rock itself, has good uplift resistance, can reduce the amount of foundation material, has less waste slag, less excavation of soil and rock, reduces the damage to the original topography of the construction area, and is beneficial to the protection of vegetation and ecological environment. At present, the rock anchor foundation and the construction method still mostly adopt the mode of anchor rod grouting, pile cap and main column cast-in-place, and the amount of concrete is large. The construction site is mostly in the mountain area, and the transportation and construction conditions are limited. At the same time, the cast-in-place foundation needs to maintain the concrete on site, which is easily affected by the construction environment, causing the concrete quality to not meet the expected standard. In addition, the cast-in-place concrete of the foundation pile cap increases the artificial workload and construction procedures of the construction site, which is not conducive to the promotion of the mechanized construction of the power transmission and transformation project. SUMMARY

[0003] The present application aims to make up for the deficiencies in the existing rock anchor foundation, and provides a power transmission line assembled rock anchor foundation and a construction method, which solves the problems of low construction efficiency of the rock anchor foundation, difficult transportation of the tower foundation and raw materials, and long on-site concrete maintenance time.

[0004] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows: a power transmission line assembled rock anchor foundation, comprising a prefabricated main column, a prefabricated bottom plate, a prefabricated side plate, a connecting steel plate and an anchor rod; the anchor rod is vertical placed in the rock stratum; the prefabricated bottom plate has a plurality of through holes, the anchor rod can pass through the holes and form an integral whole with the prefabricated bottom plate, the top of the prefabricated bottom plate is provided with a groove, the prefabricated side plate 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 position of the prefabricated bottom plate, and the prefabricated main column is pre-buried with anchor bolts and longitudinal reinforcement; the connecting steel plate is placed in the cavity formed by the prefabricated bottom plate and the prefabricated side plate, and the pre-buried anchor bolts, longitudinal reinforcement and anchor rods are fixed with the connecting steel plate through nuts.

[0005] Further, the anchor rod is fixed in the rock stratum by grouting concrete or cement mortar and forms an integral whole with the prefabricated bottom plate.

[0006] Further, the prefabricated bottom plate top is provided with a plurality of lifting rings, facilitating transportation and installation in engineering, and the upper and lower two layers of embedded steel mesh are used to ensure the bending bearing capacity of the prefabricated bottom plate.

[0007] Further, the prefabricated main column is internally provided with a circular hoop, which is used to ensure the shear bearing capacity of the prefabricated main column.

[0008] Further, the connecting steel plate is provided with the same number of reserved holes corresponding to the embedded anchor bolts, longitudinal reinforcement and anchor bars in the prefabricated main column, and the anchor bolts, longitudinal reinforcement and anchor bars are connected with the connecting steel plate through nuts, so that the prefabricated main column, connecting steel plate and anchor rod become a whole.

[0009] Further, a gasket is arranged between the connecting steel plate and the nut to increase the stress area, fasten the connection between the connecting steel plate and the anchor bolts, longitudinal reinforcement and anchor bars, and avoid stress concentration.

[0010] Further, the cavity formed by the prefabricated bottom plate and the prefabricated side plate is filled with micro-expansion fine stone concrete grouting, and the concrete grouting has a horizontal plane located in the same plane as the top surface of the prefabricated side plate and the bottom surface of the prefabricated main column, so that the prefabricated main column, prefabricated bottom plate, prefabricated side plate, connecting steel plate and anchor rod form a whole.

[0011] Further, a layer of steel mesh is arranged between the prefabricated main column and the connecting steel plate to prevent concrete cracking and improve overall rigidity.

[0012] A construction method of a power transmission line assembled rock anchor foundation, comprising the following steps: (a) component prefabrication, (b) overall assembly; wherein,

[0013] (a) Component prefabrication: according to actual engineering requirements, prefabricate main columns, bottom plates, side plates and connecting steel plates of different sizes in a factory, and embed anchor bolts and longitudinal reinforcement in the main column;

[0014] (b) Overall assembly: pass the anchor bar, anchor reinforcement, anchor bolts and longitudinal reinforcement of the prefabricated main column through the corresponding holes in the connecting steel plate, and fix them through nuts, then hoist the main column, pass the anchor rod through the reserved hole of the bottom plate, and finally hoist the prefabricated side plate in the groove of the prefabricated bottom plate, and fill the gap with micro-expansion fine stone concrete grouting.

[0015] Compared with the prior art, the present application has the following advantages and beneficial effects:

[0016] (1) Good stress performance: the overall force transmission route of the foundation is clear and definite, the connection of each prefabricated component is reliable, all steel components are effectively wrapped by concrete, and the durability is good; all components are prefabricated and processed in a factory, which greatly improves the precision and quality compared with site pouring.

[0017] (2) Convenient transportation: the bearing platform and the main column are both composed of prefabricated components processed in the factory, compared with the traditional cast-in-place bearing platform and main column, only the prefabricated blocks need to be transported to the site for assembly, there is no material waste, the weight of each prefabricated component is moderate, and the burden of transportation in mountainous areas is reduced.

[0018] (3) Improve engineering efficiency: the bearing platform and the main column are both composed of prefabricated components, compared with the traditional rock anchor foundation, the bearing platform and the main column part can be prefabricated in the factory before the construction starts, which avoids the pouring and on-site maintenance time; at the same time, the hoisting ring can be installed on the prefabricated component during the prefabrication process, which is convenient for later hoisting and assembly, reduces the construction time, and further improves the engineering efficiency.

[0019] (4) Protect the environment: compared with the traditional foundation, the assembled foundation can realize the transfer of the main construction site, the production of the assembled parts is completed in the factory, which reduces the generation of construction waste such as residual concrete, waste metal materials, packaging materials, etc., reduces the impact on the environment during the transportation, stacking and processing of raw materials at the construction site, and for the rock anchor foundation, the drilling is carried out by the anchor rod machine, which is advanced in technology and has a small construction base, fully utilizes the shear strength of the rock itself, has good uplift performance, thereby reducing the loss of foundation materials, less waste, less earthwork, reducing the damage to the original landscape in mountainous areas, and being beneficial to the protection of vegetation and ecological environment.

[0020] (5) Suitable for mechanized construction of power transmission and transformation projects: the assembled type is a convenient way to mechanize construction, compared with the traditional construction method, the assembled foundation can be designed and processed in the factory under the premise of meeting the quality and performance of the tower foundation, and has a relatively complete standard design system; at the same time, the assembled parts can be modified and matched with the corresponding construction instruments in the factory according to the actual construction needs, which is convenient for promoting the mechanized construction of power transmission and transformation projects. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a schematic view of the facade structure of the present application;

[0022] Figure 2 and Figure 3 are respectively the front view and sectional view of the prefabricated main column in the present application;

[0023] Figure 4 and Figure 5 are respectively the front view and sectional view of the prefabricated bottom plate in the present application;

[0024] Figure 6 and Figure 7 are respectively the front view and sectional view of the prefabricated side plate in the present application;

[0025] Figure 8is the front view of the connecting steel plate in the application;

[0026] Figure 9 is the front view of the anchor rod in the application;

[0027] Figure 10 is the connection structure between the longitudinal reinforcement or anchor reinforcement and the connecting steel plate in the application;

[0028] Figure 11 is the connection structure between the anchor bolt and the connecting steel plate in the application.

[0029] In the figure: 01, prefabricated main column; 11, main column body; 12, anchor bolt; 13, longitudinal reinforcement; 14, stirrup; 02, prefabricated bottom plate; 21, lifting ring; 22, steel mesh; 03, prefabricated side plate; 04, connecting steel plate; 41, first reserved hole; 42, second reserved hole; 43, third reserved hole; 05, anchor rod; 51, anchoring segment concrete; 52, anchor reinforcement; 06, adjusting nut; 07, double nut. DETAILED DESCRIPTION

[0030] The application will be further described in detail below in combination with the embodiments in the drawings, but it does not constitute any limitation to the application.

[0031] As Figure 1 shown, the up, down and other directions and relative positions refer to the up, down and other directions and relative positions in the figure, the vertical direction is the vertical direction arranged in the figure, and the horizontal direction is perpendicular to the vertical direction. The prefabricated main column 01, the prefabricated bottom plate 02, the prefabricated side plate 03, the connecting steel plate 04 and the anchor rod 05 are included in the prefabricated rock anchor foundation of the power transmission line.

[0032] As Figure 2 and Figure 3 shown, the prefabricated main column 01 is circular in the vertical direction section, and the prefabricated main column 01 includes the main column body 11, the anchor bolt 12, the longitudinal reinforcement 13 and the stirrup 14. The anchor bolt 12 is pre-buried in the main column body 11 by the factory in advance, and its length exceeds the main column body 11. Its top is used for connecting with the tower foot plate, and its bottom is connected with the connecting steel plate 04 through the adjusting nut 06 and the double nut 07. Its connection structure is as shown in Figure 11 The adjusting nut 06 is above the connecting steel plate 04, and the double nut 07 is below the connecting steel plate 04. A pad plate is arranged between the nut and the connecting steel plate 04; the longitudinal reinforcement 13 is pre-buried around the inside of the main body 11, and its bottom is exposed outside the main column body 11 and connected with the connecting steel plate 04 through the adjusting nut 06 and the double nut 07. Its connection structure is as shown in Figure 10The upper connecting steel plate 04 is provided with a double nut 07 and the lower connecting steel plate 04 is provided with an adjusting nut 06, and a pad is arranged between the nut and the connecting steel plate 04; the stirrup 14 is embedded in the inside of the main column body 11, so as to ensure the accurate spatial position of the longitudinal reinforcement 13 and to enhance the stress strength of the prefabricated main column 01.

[0033] As shown in Figure 1 , Figure 4 , Figure 5 The prefabricated bottom plate 02 is square-shaped, and a plurality of lifting rings 21 are arranged on the top of the prefabricated bottom plate 02, so as to facilitate the transportation and installation in engineering, and two layers of steel mesh 22 are embedded in the inside of the prefabricated bottom plate 02, so as to ensure the quality of the prefabricated bottom plate, and a groove for installing the prefabricated side plate 03 is arranged on the top of the prefabricated bottom plate 02, and a plurality of holes are arranged on the prefabricated bottom plate 02 and pass through the upper and lower parts (as shown in Figure 9 ).

[0034] As shown in Figure 1 , Figure 6 , Figure 7 The prefabricated side plate 03 is installed in the groove around the prefabricated bottom plate 02 and is connected with the prefabricated bottom plate 02 through a mortise and tenon structure.

[0035] As shown in Figure 1 , Figure 8 The connecting steel plate 04 is a square or circular steel plate, and the connecting steel plate 04 is arranged in the cavity formed by the prefabricated bottom plate 02 and the prefabricated side plate 03, a same number of first reserved holes 41 and second reserved holes 42 are arranged at positions corresponding to the embedded anchor bolts 12 and the longitudinal reinforcement 13 in the prefabricated main column 01, and a same number of third reserved holes 43 are arranged at positions corresponding to the anchor reinforcement of the anchor rod 05, the embedded anchor bolts 12 and the longitudinal reinforcement 13 are connected with the connecting steel plate 04 through the first reserved holes 41 and the second reserved holes 42, and the anchor reinforcement is connected with the connecting steel plate 04 through the third reserved holes 43, so that the prefabricated main column 01, the connecting steel plate 04 and the anchor rod 05 are connected with each other.

[0036] As shown in Figure 1 , Figure 9 The anchor rod 05 is a plurality of anchor rods and is vertically arranged in the rock stratum, the anchor rod 05 includes an anchoring segment concrete (or cement mortar) 51 and an anchor reinforcement 52 arranged in the anchoring segment concrete, and the anchor rod 05 is integrated with the prefabricated bottom plate 02 through the anchoring segment concrete or the cement mortar, each hole of the prefabricated bottom plate 02 corresponds to one anchor rod 05, the upper part of the anchor reinforcement 52 is exposed in the cavity formed by the prefabricated bottom plate 02 and the prefabricated side plate 03 through the hole of the prefabricated bottom plate 02, and the top is connected with the connecting steel plate 04 through the adjusting nut 06 and the double nut 07, and the connecting structure is as shown in Figure 10As shown, there are double nuts 07 on the top of the connecting steel plate 04 and adjusting nuts 06 below. There are washers between the nuts and the connecting steel plate 04.

[0037] like Figure 1 As shown, the cavity formed by the precast base plate 02 and the precast side plate 03 is filled with micro-expansion fine stone concrete grouting. The concrete grouting integrates the precast main column 01, precast base plate 02, precast side plate 03, connecting steel plate 04 and anchor rod 05 into a stable whole structure, improving the stability and support strength, and protecting the connecting steel plate from environmental corrosion. Before grouting, a layer of steel mesh is placed between the precast main column 01 and the connecting steel plate 04 to prevent concrete cracking and improve concrete strength.

Claims

1. A power transmission line fabricated rock anchor foundation, comprising a prefabricated main column, a prefabricated bottom plate, a prefabricated side plate, a connecting steel plate and an anchor rod, characterized in that: The anchor rods are vertically placed in the rock stratum, and each anchor rod comprises an anchoring segment of concrete or cement mortar and an anchoring steel bar arranged in the anchoring segment; the prefabricated bottom plate is provided with a plurality of through holes, the anchor rods can pass through the holes and form an integral body with the prefabricated bottom plate, two layers of steel mesh are pre-embedded in the prefabricated bottom plate, a groove is arranged on the top of the prefabricated bottom plate, and the prefabricated side plates are fixed in the groove of the prefabricated bottom plate through a mortise and tenon structure; the prefabricated main column is vertically arranged at the center of the prefabricated bottom plate, and a foundation bolt and a longitudinal steel bar are pre-embedded in the prefabricated main column; the connecting steel plate is arranged in the cavity formed by the prefabricated bottom plate and the prefabricated side plates, and the foundation bolt and the longitudinal steel bar in the prefabricated main column and the anchoring steel bar in the anchor rod are fixed to the connecting steel plate through nuts; the connecting steel plate is provided with the same number of reserved holes as the positions of the pre-embedded foundation bolt, longitudinal steel bar and anchoring steel bar in the prefabricated main column, and the foundation bolt, longitudinal steel bar and anchoring steel bar are connected to the connecting steel plate through nuts through the reserved holes, so that the prefabricated main column, connecting steel plate and anchor rod form an integral body; wherein the cavity formed by the prefabricated bottom plate and the prefabricated side plates is filled with micro-expansion fine stone concrete grouting, and the concrete grouting has a horizontal plane which is located in the same plane as the top surface of the prefabricated side plate and the bottom surface of the prefabricated main column.

2. The power transmission line assembled rock anchor foundation according to claim 1, characterized in that: The anchor rods are fixed in the rock stratum by pouring concrete or cement mortar and form an integral body with the prefabricated bottom plate.

3. The power transmission line fabricated rock-anchored foundation according to claim 1, characterized in that: A plurality of lifting rings are arranged on the top of the prefabricated bottom plate.

4. A power transmission line assembled rock anchor foundation according to claim 3, characterized in that: A gasket is arranged between the connecting steel plate and the nut.

5. A power transmission line assembled rock anchor foundation according to claim 4, characterized in that: A layer of steel mesh is arranged between the prefabricated main column and the connecting steel plate to prevent concrete cracking.

6. A method of construction of a foundation for a rock anchor for a power transmission line according to any one of claims 1 to 5, characterised in that: The method comprises the following steps: (a) prefabricating components, (b) assembling an integral body; wherein, (a) prefabricating components: according to actual engineering requirements, the main column, bottom plate, side plate and connecting steel plate of different sizes are prefabricated in a factory, and the foundation bolt and longitudinal steel bar are pre-embedded in the main column; (b) assembling an integral body: the anchoring steel bar of the anchor rod and the foundation bolt and longitudinal steel bar of the prefabricated main column pass through the corresponding holes of the connecting steel plate, are fixed through nuts, the main column is then hoisted, the anchor rod passes through the reserved holes of the bottom plate, and finally the prefabricated side plate is hoisted in the groove of the prefabricated bottom plate, and micro-expansion fine stone concrete grouting is used to fill the gaps.

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