A flood sluice anchor cable horizontal reserved hole permanent and temporary combined plugging structure and construction method

Abstract

A kind of flood discharge lock anchor cable horizontal preformed hole permanent and temporary combined plugging structure, including setting anchor cable preformed hole in flood discharge lock pier, setting steel pipe body in anchor cable preformed hole, setting anchor cable cable-through hole on steel pipe body, setting end steel plate at both ends of steel pipe body, setting transverse stiffening rib and longitudinal stiffening rib on the inner and outer walls of steel pipe body respectively, temporarily retaining water using end steel plate during construction period overflow period;After subsequent dry construction condition in the flow passage of flood discharge lock is formed, cut end steel plate along the inner wall of steel pipe body, then enter steel pipe body and construct anchor cable, and set in steel pipe body Grouting pipe and back grouting pipe, then pour concrete in steel pipe body, form permanent concrete plugging.The scheme solves the problem of early plugging of flood discharge lock prestressed anchor cable horizontal preformed hole when time is tight, and the contact part of plugging structure with pier does not need to be removed, and the concrete of pier will not be damaged, with very beneficial positive effect.

Description

Technical Field

[0001] This invention relates to the field of water conservancy and hydropower engineering technology, specifically to a sealing structure and construction method for a combination of permanent and temporary sealing of horizontal reserved holes in the anchor cables of a flood discharge gate. Background Technology

[0002] Flood discharge gates are a common water discharge structure in water conservancy and hydropower projects. Flood discharge gates typically have an arc-shaped working gate; closing the gate impounds water, and raising the gate releases water. During water impoundment, the flood discharge gate withstands the thrust of the upstream water. This thrust acts on the reinforced concrete anchor blocks through the hinged structure of the arc-shaped working gate. The anchor blocks are stabilized by pre-tensioning through-type prestressed anchor cables. The downstream end of the anchor cable is located on the surface of the anchor block, while the upstream end is located inside the gate pier. The upstream end is at a lower elevation, and the anchor cable can only be tensioned after the gate pier concrete has reached its curing age. Therefore, a horizontal pre-drilled hole perpendicular to the water flow direction is required at the upstream end of the anchor cable to facilitate subsequent anchor cable tensioning.

[0003] According to the normal construction schedule, to avoid construction interference, the prestressed anchor cable tensioning and the sealing of the horizontal reserved holes need to be completed before the floodgate overflows. When the construction period is tight and the anchor cable tensioning cannot be completed before the floodgate overflows, temporary sealing measures need to be taken for the reserved holes to prevent water from entering the reserved holes, contaminating the channels, and affecting the flow pattern of the floodgate. Once the dry site conditions are met for the installation of the arc-shaped working gate, the temporary sealing structure will be removed, and the anchor cable tensioning and sealing of the reserved holes will be completed.

[0004] However, the existing temporary sealing structure needs to be fixed in the concrete structure, and the demolition work is cumbersome and will damage the gate pier concrete. Summary of the Invention

[0005] The purpose of this invention is to provide a permanent and temporary sealing structure for the horizontal reserved holes of the anchor cables of a flood discharge gate, which can solve the problem of early sealing of the horizontal reserved holes of the prestressed anchor cables of the flood discharge gate when the construction period is tight. The part of the sealing structure in contact with the gate pier does not need to be removed and will not damage the concrete of the gate pier.

[0006] Another objective of this invention is to provide a construction method for a permanent and temporary sealing structure for the horizontal reserved holes of the flood discharge gate anchor cable.

[0007] The technical solution of the present invention for a permanent and temporary sealing structure for horizontal pre-reserved holes of anchor cables in a flood discharge gate is as follows: An anchor cable pre-reserved holes are set in the flood discharge gate piers; a steel pipe body is installed in the anchor cable pre-reserved holes; anchor cable through-holes are set on the steel pipe body; end steel plates are provided at both ends of the steel pipe body; transverse stiffening ribs and longitudinal stiffening ribs are respectively set on the inner and outer walls of the steel pipe body; during the flow period of construction, the end steel plates are used to temporarily block water; after the dry construction conditions are formed in the flood discharge gate channel, the end steel plates are cut off along the inner wall of the steel pipe body, and then the anchor cables are installed inside the steel pipe body. A grout inlet pipe and a grout return pipe are installed in the steel pipe body, and then concrete is poured into the steel pipe body to form a permanent concrete seal.

[0008] Furthermore, the strength and thickness of the steel pipe body material should be determined according to the relevant requirements of the template, and Q235 steel with a thickness of not less than 10mm should be selected.

[0009] Furthermore, inner transverse connecting holes, outer transverse connecting holes, inner longitudinal connecting holes, and outer longitudinal connecting holes are respectively provided on the inner and outer walls of the transverse stiffening ribs and the longitudinal stiffening ribs to ensure that the concrete is poured densely.

[0010] Furthermore, the thickness of the transverse stiffening ribs should be checked for shear resistance based on the maximum hydrodynamic pressure that may be experienced under unilateral water-blocking conditions; the thickness of the longitudinal stiffening ribs, according to the structural configuration, can be calculated using the following formula:

[0011] Where h is the thickness of the transverse stiffening rib, k is the safety factor, f is the dynamic water pressure, A is the cross-sectional area of ​​the anchor cable reserved hole, n is the number of rows of transverse stiffening ribs, D is the outer diameter of the steel pipe body, and v is the shear strength of the transverse stiffening rib.

[0012] The present invention discloses a construction method for a permanent and temporary sealing structure for horizontal pre-reserved holes in the anchor cables of a flood discharge gate, comprising the following steps:

[0013] S1. Fabricate steel pipes for sealing anchor cable reserved holes according to design requirements, including the steel pipe body, end steel plates, transverse stiffening ribs and longitudinal stiffening ribs;

[0014] S2. Fabricate and install steel bars according to design requirements, erect formwork and pour gate pier concrete up to the anchor cable reserved hole pouring chamber, with the chamber surface lower than the bottom of the hole.

[0015] S3. According to the design requirements, fabricate and install the reinforcing bars in the pouring chamber where the anchor cable reserved hole is located, install and fix the steel pipe processed in step S1, use the steel pipe as the support template at the anchor cable reserved hole, erect the template of the other parts and pour concrete.

[0016] S4. According to the design requirements, steel bars are fabricated and installed, formwork is erected and gate pier concrete is poured to the top of the gate. The floodgate can be allowed to flow after the concrete has reached the required curing time. During the flow period of the construction period, the steel plates at both ends of the steel pipe body are used to temporarily block water at the anchor cable reserved holes.

[0017] S5. When the dry site conditions are met for the installation of the arc-shaped working gate, the end steel plate is cut off along the inner wall of the steel pipe body. Construction personnel enter the anchor cable reserved hole to install the anchor cable and tie the surface steel bars at both ends of the steel pipe body. The surface steel bars are bent at the end and welded to the steel pipe body. Then concrete is poured to form a permanent concrete seal in the anchor cable reserved hole.

[0018] S6. After the permanent concrete in the anchor cable pre-reserved hole has set, the permanent concrete is grouted through the grout inlet pipe and the grout return pipe to make the permanent concrete seal dense.

[0019] The present invention has the following beneficial effects:

[0020] (1) It can solve the need for temporary sealing of anchor cable reserved holes before anchor cable tensioning is completed under tight construction schedule, and prevent water flow from entering the reserved holes, polluting the channels and affecting the flow pattern of the floodgate;

[0021] (2) When implementing permanent sealing concrete, only the end steel plate that is not in direct contact with the gate pier concrete needs to be cut off, without damaging the gate pier concrete;

[0022] (3) After the steel plate is cut off, anchor cables are directly installed on the inside of the steel pipe and pumped to pour first-grade or self-compacting micro-expansion concrete to form a permanent structure, which is sealed tightly. At the same time, the shear resistance of the inner and outer stiffening ribs of the steel plate is utilized to ensure that the permanent sealing structure is safe and reliable. Attached Figure Description

[0023] Figure 1 This is a schematic cross-sectional view of the sealing structure during the temporary sealing period of the present invention;

[0024] Figure 2 This is a longitudinal cross-sectional schematic diagram of the sealing structure during the temporary sealing period of the present invention;

[0025] Figure 3 This is a schematic cross-sectional view of the sealing structure during the permanent sealing period of the present invention;

[0026] Figure 4 This is a schematic diagram of the lateral and longitudinal sections of the sealing structure during the permanent sealing period of the present invention. Detailed Implementation

[0027] To enable those skilled in the art to more clearly understand the purpose, technical solution and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments, but the present invention is not limited to the following embodiments.

[0028] In the description of this invention, it should be noted that the terms "upper", "lower", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the construction must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0029] This invention relates to a permanent and temporary sealing structure for horizontal pre-reserved holes of anchor cables in a flood discharge gate. It includes pre-reserved holes 02 for anchor cables in the gate pier 01, a steel pipe body 1 within the pre-reserved holes 02, anchor cable insertion holes 2 on the steel pipe body 1, and end plates 9 at both ends of the steel pipe body 1. Transverse stiffening ribs 3 and longitudinal stiffening ribs 4 are respectively installed on the inner and outer walls of the steel pipe body 1. During the flow period in the construction phase, the end plates 9 temporarily block water. After dry conditions are established in the flood discharge gate channel, the end plates 9 are cut along the inner wall of the steel pipe body 1, and anchor cables are installed inside the steel pipe body 1. A grout inlet pipe 10 and a grout return pipe 11 are installed inside the steel pipe body 1. Finally, concrete is poured into the steel pipe body 1 to form a permanent concrete seal 03.

[0030] like Figure 1 , Figure 2 As shown, this is the sealing structure during the temporary sealing period. The steel pipe body 1 is processed according to the shape of the anchor cable reserved hole 02. Both ends of the steel pipe body 1 are sealed with end steel plates 9. The anchor cable through hole 2 is only installed at the anchor cable through position. The inner and outer walls of the steel pipe body 1 are welded with transverse stiffening ribs 3 and longitudinal stiffening ribs 4 according to the design requirements. During the flow period of construction, the end steel plates 9 are used to temporarily block water.

[0031] Figure 3 , Figure 4 As shown, this is the sealing structure during the permanent sealing period. Based on the sealing structure during the temporary sealing period, after the dry construction conditions are formed in the floodgate channel, the end steel plate 9 is cut along the inner wall of the steel pipe body 1 to form a pipe opening. Then, the construction personnel enter the steel pipe body 1 through the pipe opening to install anchor cables. After that, concrete is poured into the steel pipe body 1 to form a permanent concrete seal 03. To ensure the compactness of the pouring, the concrete is a first-grade mix or self-compacting micro-expansion concrete. The permanent concrete seal can be grouted through the grout inlet pipe 10 and the grout return pipe 11, making the permanent concrete seal even more compact.

[0032] The strength and thickness of the steel pipe body 1 material should be determined according to the relevant requirements of the template, and Q235 steel with a thickness of not less than 10mm should be selected.

[0033] The inner and outer sides of the transverse stiffening rib 3 and the longitudinal stiffening rib 4 are respectively provided with inner transverse connecting holes 5, outer transverse connecting holes 6, inner longitudinal connecting holes 7, and outer longitudinal connecting holes 8, so as to ensure that the concrete is poured densely.

[0034] The thickness of the transverse stiffening ribs 3 is verified for shear resistance based on the maximum dynamic water pressure under single-sided water-blocking conditions; the thickness of the longitudinal stiffening ribs 4 is calculated according to the structural configuration, and the thickness of the transverse stiffening ribs 3 is calculated using the following formula:

[0035] Where h is the thickness, k is the safety factor, f is the dynamic water pressure, A is the cross-sectional area of ​​the anchor cable reserved hole 02, n is the number of rows of transverse stiffening ribs 3, D is the outer diameter of the steel pipe body 1, and v is the shear strength of the transverse stiffening ribs 3.

[0036] The present invention provides a construction method for a permanent and temporary sealing structure for horizontal pre-reserved holes in the anchor cables of a flood discharge gate, comprising the following steps:

[0037] S1. Fabricate steel pipes for sealing anchor cable reserved holes according to design requirements, including steel pipe body 1, end steel plate 9, transverse stiffening rib 3 and longitudinal stiffening rib 4;

[0038] S2. Fabricate and install steel bars according to design requirements, erect formwork and pour gate pier concrete up to the anchor cable reserved hole pouring chamber. The chamber surface should be appropriately lower than the bottom of the hole.

[0039] S3. According to the design requirements, fabricate and install the reinforcing bars in the pouring chamber where the anchor cable reserved hole is located, install and fix the steel pipe processed in step S1, use the steel pipe as the support template at the anchor cable reserved hole, erect the template of the other parts and pour concrete.

[0040] S4. According to the design requirements, steel bars are made and installed, formwork is erected and gate pier concrete is poured to the top of the gate. The floodgate can be allowed to flow after the concrete reaches the required curing time. During the flow period of construction, the end steel plates 9 at both ends of the steel pipe body 1 are used to temporarily block water at the anchor cable reserved hole.

[0041] S5. When the dry site conditions are met for the installation of the arc-shaped working gate, the end steel plate is cut off along the inner wall of the steel pipe body. Construction personnel enter the anchor cable reserved hole to install the anchor cable and tie the surface steel bar 12 at both ends of the steel pipe body. The surface steel bar 12 is bent at the end and welded to the steel pipe body 1. Then, concrete is pumped to form a permanent concrete seal in the anchor cable reserved hole.

[0042] S6. After the permanent concrete in the anchor cable pre-reserved hole has set, the permanent concrete is grouted through the grout inlet pipe and the grout return pipe to make the permanent concrete seal dense.

[0043] The above steps solve the problem of pre-sealing the horizontal reserved holes of the prestressed anchor cables of the flood discharge gate when the construction period is tight. Furthermore, the part of the sealing structure in contact with the gate pier does not need to be removed, and the gate pier concrete will not be damaged, which has a very beneficial and positive effect.

[0044] The above description is merely a preferred embodiment of the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A construction method for a permanent and temporary sealing structure for horizontal pre-reserved holes in the anchor cables of a flood discharge gate, characterized in that... Includes the following steps: S1. Fabricate steel pipes for sealing anchor cable reserved holes according to design requirements, including the steel pipe body, end steel plates, transverse stiffening ribs and longitudinal stiffening ribs; S2. Fabricate and install steel bars according to design requirements, erect formwork and pour gate pier concrete up to the anchor cable reserved hole pouring chamber, with the chamber surface lower than the bottom of the hole. S3. According to the design requirements, fabricate and install the reinforcing bars in the pouring chamber where the anchor cable reserved hole is located, install and fix the steel pipe processed in step S1, use the steel pipe as the support template at the anchor cable reserved hole, erect the template of the other parts and pour concrete. S4. According to the design requirements, steel bars are fabricated and installed, formwork is erected and gate pier concrete is poured to the top of the gate. The floodgate can be allowed to flow after the concrete has reached the required curing time. During the flow period of the construction period, the steel plates at both ends of the steel pipe body are used to temporarily block water at the anchor cable reserved holes. S5. When the dry site conditions are met for the installation of the arc-shaped working gate, the end steel plate is cut off along the inner wall of the steel pipe body. Construction personnel enter the anchor cable reserved hole to install the anchor cable and tie the surface steel bars at both ends of the steel pipe body. The surface steel bars are bent at the end and welded to the steel pipe body. Then concrete is poured to form a permanent concrete seal in the anchor cable reserved hole. S6. After the permanent concrete in the anchor cable pre-reserved hole has set, the permanent concrete is grouted through the grout inlet pipe and the grout return pipe to make the permanent concrete seal dense.

2. The construction method of the permanent and temporary sealing structure for the horizontal reserved hole of the flood discharge gate anchor cable as described in claim 1, characterized in that... The method includes setting anchor cable reserved holes (02) in the floodgate pier (01), setting steel pipe body (1) in the anchor cable reserved holes (02), setting anchor cable through holes (2) on the steel pipe body (1), setting end steel plates (9) at both ends of the steel pipe body (1), setting transverse stiffening ribs (3) and longitudinal stiffening ribs (4) on the inner and outer walls of the steel pipe body (1) respectively, using end steel plates (9) to temporarily block water during the flow period of construction; after the dry construction conditions are formed in the floodgate channel, the end steel plates (9) are cut off along the inner wall of the steel pipe body (1), and then anchor cables are installed in the steel pipe body (1), and grout inlet pipe (10) and grout return pipe (11) are set in the steel pipe body (1), and then concrete is poured in the steel pipe body (1) to form a permanent concrete seal (03).

3. The construction method of the permanent and temporary sealing structure for the horizontal reserved hole of the flood discharge gate anchor cable as described in claim 1, characterized in that... The strength and thickness of the steel pipe body (1) material shall be determined in accordance with the relevant requirements of the template, and Q235 steel with a thickness of not less than 10mm shall be selected.

4. The construction method of the permanent and temporary sealing structure for the horizontal reserved hole of the flood discharge gate anchor cable as described in claim 1, characterized in that... The inner and outer walls of the transverse stiffening rib (3) and the longitudinal stiffening rib (4) are respectively provided with an inner transverse connecting hole (5), an outer transverse connecting hole (6), an inner longitudinal connecting hole (7), and an outer longitudinal connecting hole (8) to ensure that the concrete is poured densely.

5. The construction method of the permanent and temporary sealing structure for the horizontal reserved hole of the flood discharge gate anchor cable as described in claim 1, characterized in that... The thickness of the transverse stiffening ribs (3) is verified for shear resistance based on the maximum dynamic water pressure under single-sided water-blocking conditions; the thickness of the longitudinal stiffening ribs (4) is calculated according to the structural configuration, and the thickness of the transverse stiffening ribs (3) is calculated using the following formula: Where h is the thickness, k is the safety factor, f is the dynamic water pressure, A is the cross-sectional area of ​​the anchor cable reserved hole (02), n is the number of rows of transverse stiffening ribs (3), D is the outer diameter of the steel pipe body (1), and v is the shear strength of the transverse stiffening ribs (3).

Images