CN102425188B - Method for adjusting height-adjustable tower foundation - Google Patents

Abstract

The invention belongs to the field of foundation engineering of power transmission lines, and in particular relates to a height-adjustable pole tower foundation and an adjustment method thereof. The tower foundation mainly includes columns, beams I, vertical beams, beams II, vertical braces, bottom plates and anchor bolts. The tower foundation connects the columns used to support the tower legs into an integrated structure, which is not prone to unevenness. Settlement, when the uneven settlement of the ground causes the tower foundation to tilt, the adjustment method of the present invention can adjust the height of the four corners of the tower foundation, so that the top surfaces of the columns supporting the tower legs can be kept horizontal again to ensure the stability of the upper tower sexual demands. The pole tower foundation has the advantages of simple structure, stability and reliability, etc., and can meet the stability requirements of the upper pole tower; the adjustment method has the advantages of simple operation, high reliability, and the like.

Description

A method for adjusting the height-adjustable tower foundation

technical field

The invention belongs to the field of foundation engineering of power transmission lines, and in particular relates to a method for adjusting height-adjustable tower foundations when they are tilted.

Background technique

According to the structural form, transmission lines are divided into overhead transmission lines and cable lines. Overhead transmission lines are usually composed of towers, wires, insulators, line fittings, guy wires, tower foundations, grounding devices, etc., and are erected on the ground. Existing tower foundations generally adopt independent foundations. As shown in Figure 1, the tower 11 has four tower legs 12, and each tower leg is supported by an independent foundation. The independent foundation includes upper columns 13 and lower stepped Bottom plate 14. In order to avoid harm to the human body, transmission lines are usually built in remote or sparsely populated areas, and some transmission lines are also erected in areas with harsh environments, such as mountains or near coal mines. When the transmission line passes through coal mine goafs, it may cause uneven subsidence of the foundation. When the settlement is uneven, it will cause uneven settlement of the foundation, so that the settlement of the tower legs of the tower is uneven. When the uneven settlement exceeds a certain level, it will inevitably lead to damage to the upper tower structure, thereby affecting the operation safety of the transmission line.

Therefore, there is an urgent need for those skilled in the art to develop a height-adjustable tower foundation that can meet the structural stability requirements of the upper tower when uneven settlement occurs on the tower legs of the tower and its adjustment method when tilting occurs.

Contents of the invention

In order to overcome the above-mentioned defects of the prior art, one of the purposes of the present invention is to propose a height-adjustable tower foundation adjustment method that can meet the structural stability requirements of the tower.

The present invention is achieved through the following technical solutions:

A method for adjusting the height-adjustable tower foundation. The tower foundation includes columns, beams I, vertical beams, beams II, vertical braces, bottom plates and anchor bolts. The columns used to support the tower legs pass through the beams I and vertical Beams are connected to form a basic structure, and two beams II are symmetrically arranged on both sides of the basic structure, and the two beams II on each side are connected by vertical braces, and a bottom plate is provided at the lower end of every two beams II connected by vertical braces , all the anchor bolts are buried in the bottom plate, and the tops of them pass through the corresponding through holes on the beam II and the vertical support in turn, and then are fastened by gaskets and nuts; the upper and lower end surfaces of the gaskets are both horizontal. Ring structure; when the foundation of the pole tower is inclined, the gasket is replaced with a gasket, and the gasket has a ring structure with a horizontal lower end surface and an inclined upper end surface;

The adjustment method includes the following steps:

A) When the uneven settlement of the ground causes the foundation of the tower to tilt, first unscrew the nuts fixing the anchor bolts, remove the gasket and nuts; then dig out the space between the vertical brace and the bottom plate, and use tools to tighten the vertical brace Lift up the lower side, and adjust the top surface of the vertical support to a horizontal state;

B) If after the adjustment in step A, the uneven settlement of the foundation has ended, first use concrete or cement mortar to pour the through holes on the beam II and the vertical brace and the space between the beam II and the bottom plate to form an integrated structure; The sheet is set on the anchor bolts, and the anchor bolts are fixed by nuts; finally, the tool for jacking up the lower side of the vertical brace is taken out, and the space between the vertical brace and the bottom plate is poured into an integrated structure with concrete or cement mortar ;

C) If after the adjustment in step A, it is predicted that the uneven settlement of the foundation will occur again, use a protective pipe with the same diameter as the through hole to protect the section of anchor bolts between the beam II and the bottom plate, and use concrete or cement mortar to The space between the beam II and the bottom plate is poured into an integrated structure; when the secondary uneven settlement of the foundation is over, use tools to readjust the top surface of the vertical brace to a horizontal state, and then repeat step B; if it is predicted that the uneven settlement of the foundation will Continue to generate, then repeat step C;

The gasket in the step A has a ring structure with both upper and lower end surfaces being horizontal, and the gasket in the step B has a ring structure with a horizontal lower end surface and an inclined upper end surface.

Wherein, the diameter of the through hole on the beam II and the vertical support is not less than twice the diameter of the anchor bolt.

Wherein, the bottom surfaces of the beam I, the vertical beam and the beam II are all flush with the bottom surface of the column, and the top surfaces of the beam I, the vertical beam and the beam II are all lower than the top surface of the column.

Wherein, the column, the beam I, the vertical beam, the beam II, and the vertical brace are connected into an integrated structure.

Wherein, the number of the columns is four, and the four columns are distributed according to a rectangle.

Wherein, in the step B, before using concrete or cement mortar to pour the space between the beam II and the bottom plate and the space between the vertical brace and the bottom plate into an integrated structure, the space between the beam II and the bottom plate and the space between the vertical brace and the bottom plate Set the steel mesh sheet in the space between.

Wherein, the lower side of the vertical support is jacked up, and the tool for adjusting the top surface of the vertical support to a horizontal state is a jack.

The beneficial effects of the present invention are:

1) The pole tower foundation of the present invention connects each upright column that is used to support the tower legs of the pole tower through the crossbeam I and the vertical beam into an integrated structure. This form of pole tower foundation is not prone to uneven settlement. When the foundation is unevenly settled, the present invention The tower foundation structure can fully meet the stability requirements of the upper tower; the tower foundation has the advantages of simple structure, stability and reliability.

2) When the uneven settlement of the ground causes the tower foundation to tilt, the adjustment method of the present invention can adjust the height of the four corners of the tower foundation, so that the top surface of the column can be kept horizontal again to ensure the stability requirements of the upper tower; the adjustment method has It has the advantages of simple operation and high reliability.

Description of drawings

Fig. 1 is the structural schematic diagram of existing free-standing foundation, wherein, 11-pole tower, 12-tower leg, 13-column, 14-base plate;

Fig. 2 is a schematic structural view of the height-adjustable pole tower foundation of the present invention;

Fig. 3 is the A-A sectional view of Fig. 2;

Fig. 4 is the B-B sectional view of Fig. 2;

Fig. 5 is a schematic diagram of the state of the tower foundation after being adjusted by the adjustment method of the present invention;

Fig. 6 is the enlarged schematic view of part I in Fig. 5

Among them, 21-column, 22-beam I, 23-vertical beam, 24-beam II, 25-vertical support, 26-bottom plate, 27-anchor bolt, 28, 28'-washer, 29-nut, 210- Through hole, 211-protective pipe, 212-jack, 213-cement mortar or concrete.

Detailed ways

The height-adjustable pole tower foundation of the present invention and its adjustment method when tilted will be described in further detail below in conjunction with the accompanying drawings.

As shown in Figure 2-4, the height-adjustable tower foundation in this example mainly includes the column 21 for supporting the tower leg 12, the beam I 22, the vertical beam 23, the beam II 24, the vertical brace 25, the bottom plate 26 and Anchor bolt 27; Column 21, crossbeam I 22, vertical beam 23, crossbeam II 24, vertical brace 25 are connected into an integrated structure. Between the four columns 21, two symmetrically arranged beams 122 and two symmetrically arranged vertical beams 23 are connected to form a basic structure. The cross section of the basic structure is a rectangle. The outer sides of the column 21 are respectively connected with a beam II, wherein two beams II are arranged coaxially with a beam I between the column, and the other two beams II are arranged coaxially with the other beam I symmetrically arranged between the column, And the upper ends of every two opposite beams II are connected by a vertical brace 25, and a bottom plate 26 with four anchor bolts 27 is fixed at the lower ends of the two beams II connected by vertical braces, and each beam II 24 and vertical brace 25 are all provided with through holes 210 for corresponding anchor bolts to pass through. 28 and nut 29 for fastening. The bottom surface of crossbeam I 22, vertical beam 23 and crossbeam II 24 is all flush with the bottom surface of column 21, and the top surface of crossbeam I, vertical beam and crossbeam II is all lower than the top surface of column. Column 21, crossbeam I 22, vertical beam 23, crossbeam II 24, vertical brace 25 and base plate 26 are all integrally casted by steel skeleton and concrete.

In order to make the adjustment convenient when the tower foundation is inclined, it is preferable to make the aperture of the through hole 210 on the beam II 24 and the vertical brace 25 not less than 2 times of the anchor bolt 27 diameters.

The gasket 28 of the initially constructed tower foundation is in the shape of a ring, and its bottom and top surfaces are both horizontal; when the uneven settlement of the foundation causes the tower foundation to tilt, the gasket 28 is removed and replaced according to the settlement height of each column into a new pad 28', the new pad 28' is a ring-shaped structure whose bottom surface is a horizontal plane and the top surface is an inclined surface. The axes of the adjusted anchor bolts 27 are perpendicular to each other to ensure that the nuts 29, washers 28' and the anchor bolts 27 cooperate with each part of the tower foundation for fastening and connection.

When the uneven settlement of the foundation causes the tower foundation to tilt, the tower foundation can be adjusted through the following adjustment methods. The specific steps include:

A) When the uneven settlement of the ground causes the tower foundation to incline, first unscrew the nut 29 of the anchor bolt, take off the gasket 28 and the nut 29; then dig the space between the vertical brace 25 and the base plate 26, and place The jack 212 is placed at the end with larger settlement, and the lower side of the vertical brace 25 is lifted up, and the top surface of the vertical brace is adjusted to a horizontal state;

B) If after step A is adjusted, the settlement monitoring instrument predicts that the uneven settlement of the foundation has basically ended, then first use concrete or cement mortar to seal the through holes 210 on the beam II and the vertical brace and the gap between the beam II 24 and the base plate 26 The space is poured into an integrated structure; then the gasket 28' is sleeved on the anchor bolt 27 to ensure that the bottom surface of the new gasket 28' is closely attached to the top surface of the vertical support 25, and the axis of the top surface and the anchor bolt 27 The direction is vertical; then the anchor bolts are fixed by nuts 29; after fixing, take out the jack 212, and use concrete or cement mortar to pour the space between the vertical brace 25 and the bottom plate 26 into an integrated structure, after adjustment by this adjustment method The tower foundation shown in Figure 5;

C) If after the adjustment in step A, it is predicted by the settlement monitoring instrument that the uneven settlement of the foundation will occur again, then use the protective pipe 211 with the same diameter as the through hole 210 (the same diameter is: the aperture of the through hole and the outer surface of the protective pipe) diameter is equal,) protect that section of anchor bolt 27 between beam II 24 and base plate 26, and pour the space between beam II 24 and base plate 26 into an integrated structure with concrete or cement mortar 213, and protective pipe 211 can adopt steel pipe; When the space between the beam II 24 and the base plate 26 can be guaranteed to be poured through the protective pipe 211, concrete or cement mortar 213 will not be poured into the through hole 210, so that when the settlement occurs again, the tower foundation can also be adjusted; When it is predicted by the settlement monitoring instrument that the secondary uneven settlement of the foundation has ended and no further settlement will occur, then use the jack 212 to readjust the top surface of the vertical brace 25 to a horizontal state, and then repeat step B; if the settlement monitoring instrument predicts that If uneven settlement of foundation will continue to occur, repeat step C.

In order to improve the stability of the tower foundation, before the space between the beam II 24 and the base plate 26 and the space between the vertical brace 25 and the base plate 26 are poured into an integrated structure with concrete or cement mortar 213, it is best to place the beam II 24 and the base plate The space between 26 and the space between the vertical support 25 and the base plate 26 are all provided with reinforced mesh sheets.

The gasket 28 of the initially constructed tower foundation is circular, and its bottom and top surfaces are both horizontal; when uneven settlement of the foundation causes the tower foundation to tilt, according to the height of the settlement of each column, it is necessary to adjust the anchor bolts 27 Before fastening, the new gasket 28' is sleeved on the anchor bolt 27. Since the gasket 28' is a ring-shaped structure with the bottom surface as a horizontal plane and the top surface as an inclined surface (the top surface and the bottom surface of the gasket 28' The angle between them is 0°<θ<90°), so it can be satisfied that the bottom surface of the gasket 28' as shown in Fig. The axes are perpendicular to each other, which can ensure the tight connection between the nut and the anchor bolt, making the adjusted tower foundation safer and more reliable.

When the uneven settlement of the foundation causes the tower foundation to tilt, the height of the four corners of the tower foundation can be adjusted through this adjustment method, so that the top surfaces of the columns supporting the tower legs can be kept horizontal again to ensure the stability requirements of the upper tower.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the present invention can still be Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention shall be covered by the scope of the claims of the present invention.

Claims (7)

1. the control method of an adjustable height type pole and tower foundation, described pole and tower foundation comprises column (21), crossbeam I (22), vertical beam (23), crossbeam II (24), perpendicular support (25), base plate (26) and foundation bolt (27), it is characterized in that: each column (21) for supporting shaft tower tower leg is linked to be basic structure by crossbeam I (22) and vertical beam (23), the both sides of this basic structure are arranged with two crossbeam II (24) respectively, be connected by perpendicular support (25) between two crossbeam II of every side, a base plate (26) is provided with in every two crossbeam II lower ends be connected by perpendicular support, each foundation bolt (27) is all embedded in base plate (26), and its top is successively through being undertaken fastening by pad (28) and nut (29) after crossbeam II (24) and the upper corresponding through hole (210) of perpendicular support (25), described pad (28) goes to upper and lower the circular ring structure that end face is horizontal plane, when this pole and tower foundation run-off the straight, pad (28) is replaced by pad (28 '), described pad (28 ') is horizontal, upper surface in lower surface is the circulus of inclined plane,

The control method of described adjustable height type pole and tower foundation comprises the steps:

A) when uneven settlement of foundation causes this pole and tower foundation run-off the straight, first unscrew the nut (29) of foot bolt regularly, take off pad (28) and nut (29); Excavate the space between perpendicular support (25) and base plate (26) again, will erect support (25) lower side jack-up with instrument, the end face of the perpendicular support of adjustment is to level;

B) if after steps A adjustment, uneven settlement of foundation terminates, then first adopt concrete or cement mortar crossbeam II and the perpendicular through hole (210) that supports and the space between crossbeam II (24) and base plate (26) to be poured into an integrated entity formula structure; Again pad (28 ') is sheathed on foundation bolt (27), and by nut (29), foundation bolt is fixed; Finally take out jack-up and erect the instrument of the lower side of support, adopt concrete or cement mortar to be poured into an integrated entity in the space of erecting between support (25) and base plate (26) formula structure;

C) if after steps A adjustment, predict uneven settlement of foundation can again produce, then protect that section of foundation bolt (27) between crossbeam II (24) and base plate (26) with through hole (210) with the pillar (211) in footpath, and adopt concrete or cement mortar to be poured into an integrated entity in the space between crossbeam II (24) and base plate (26) formula structure; When secondary uneven settlement of foundation terminates, then readjust the end face of perpendicular support to level with instrument, repeat step B; Can continue to produce as predicted uneven settlement of foundation, then repeat step C;

Described steps A) in pad (28) go to upper and lower the circular ring structure that end face is horizontal plane, the pad (28 ') in described step B is horizontal, upper surface in lower surface is the circulus of inclined plane.

2. control method as claimed in claim 1, is characterized in that: the aperture of described crossbeam II (24) and the upper through hole (210) of perpendicular support (25) is not less than 2 times of foundation bolt (27) diameter.

3. control method as claimed in claim 1, it is characterized in that: described crossbeam I (22), vertical beam (23) are all concordant with the bottom surface of column (21) with the bottom surface of crossbeam II (24), and the end face of described crossbeam I, vertical beam and crossbeam II is all lower than the end face of column.

4. control method as claimed in claim 1, is characterized in that: described column (21), crossbeam I (22), vertical beam (23), crossbeam II (24), perpendicular support (25) are connected formula structure.

5. control method as claimed in claim 1, is characterized in that: the quantity of described column (21) is four, and four root posts distribute according to rectangle.

6. control method as claimed in claim 1, it is characterized in that: in described step B, before the formula structure that the space between crossbeam II (24) and base plate (26) and perpendicular space of support between (25) and base plate (26) poured into an integrated entity by concrete or cement mortar, the space between crossbeam II (24) and base plate (26) and erect the spatial placement reinforced mesh supportted between (25) and base plate (26).

7. the control method as described in claim 1 or 6, is characterized in that: will erect support (25) lower side jack-up, and the perpendicular end face supportted of adjustment is jack (212) to the instrument of level.