A subway new and old station floor joint processing method

Abstract

The present application relates to a kind of subway new and old station floor joint processing method, comprising the following steps: from top to bottom to the diaphragm wall of new and old station junction is chiseled, until the diaphragm wall chiseled surface and the height difference of old station floor lower side is 25~35cm;Plate structure reinforcement frame and beam structure reinforcement frame are correspondingly set on the new station side and the upper side of diaphragm wall, and make plate structure reinforcement frame and beam structure reinforcement frame and the anchoring reinforcement in old station floor connect;By pouring concrete on beam structure reinforcement frame and plate structure reinforcement frame, corresponding transition beam and new station floor are formed, transition beam is T-shaped with upper half wider than lower half, and the upper half of transition beam is correspondingly pressed on old station floor and new station floor.The advantages of simple process, easy to implement, safe and reliable.

Description

Technical Field

[0001] This invention relates to a construction method, specifically a construction method for treating the joints between the foundation slabs of new and old subway stations. Background Technology

[0002] Subways are an important part of urban public transportation, offering numerous advantages such as speed, convenience, environmental friendliness, and energy efficiency. In recent years, with the rapid advancement of urbanization, subway construction has developed rapidly, and newly built subway stations are often combined with existing ones to form transfer stations. For transfer stations formed by combining new and old stations, properly handling the joints between the old and new station floor slabs is particularly important. The traditional method for handling these joints involves connecting the pre-reserved steel reinforcement connectors on the upper part of the old station floor slab to the newly poured section before concrete pouring. This method has the following problems: 1. Water leakage is prone to occur at the floor slab joints; 2. Uneven settlement on both sides of the joint can easily cause deformation and cracking. Summary of the Invention

[0003] The purpose of this invention is to provide a method for treating the joints between the old and new subway station floor slabs, which has the advantages of simple procedures, convenient implementation, high work efficiency, and safety and reliability.

[0004] To address the aforementioned problems in the existing technology, this invention provides a method for treating the joints between the old and new subway station floor slabs, comprising the following steps:

[0005] S1. From top to bottom, the diaphragm wall at the connection between the old and new stations is chiseled away until the height difference between the chiseled surface of the diaphragm wall and the lower side of the old station floor is H1, where H1 = 25-35cm.

[0006] S2. Install slab structure steel frame and beam structure steel frame on the side of the new station and the side of the diaphragm wall, and connect the slab structure steel frame with the beam structure steel frame and the anchoring steel in the old station floor slab.

[0007] S3. By pouring concrete on the steel reinforcement frame of the beam structure and the steel reinforcement frame of the slab structure, a transition beam and a new station base slab are formed. The transition beam is T-shaped with the upper half wider than the lower half. The upper half of the transition beam presses on the old station base slab and the new station base slab respectively.

[0008] Furthermore, the present invention provides a method for treating the joint between the old and new subway station base slabs, wherein the slab structure steel reinforcement frame includes an upper row of longitudinally spaced main reinforcement bars and a lower row of longitudinally spaced main reinforcement bars, and the anchoring reinforcement includes an upper row of anchoring bars that are connected one-to-one with the upper row of main reinforcement bars and a lower row of anchoring bars that are connected one-to-one with the lower row of main reinforcement bars.

[0009] Furthermore, the present invention provides a method for treating the joint between the old and new subway station base slabs, wherein the slab structure steel reinforcement frame further includes an upper row of slab structure reinforcing bars distributed longitudinally at intervals and a lower row of slab structure reinforcing bars distributed longitudinally at intervals, and the anchoring reinforcing bars further include an upper row of anchoring reinforcing bars that are connected one-to-one with the upper row of slab structure reinforcing bars, and a lower row of anchoring reinforcing bars that are connected one-to-one with the lower row of slab structure reinforcing bars.

[0010] Furthermore, the present invention provides a method for treating the joint between the old and new subway station floor slabs, wherein the beam structure reinforcement frame includes transversely spaced upper row of main beam reinforcement and transversely spaced lower row of main beam reinforcement. The overall width of the upper row of main beam reinforcement is greater than the overall width of the lower row of main beam reinforcement. Multiple open stirrups are provided between the lower row of main beam reinforcement and the upper row of main beam reinforcement. On both sides of the open stirrups and below the upper row of main beam reinforcement, transversely spaced middle row of main beam reinforcement is also provided. Closed stirrups are provided between the middle row of main beam reinforcement and the upper row of main beam reinforcement.

[0011] Furthermore, the present invention provides a method for treating the joint between the old and new subway station floor slabs, wherein the beam structure steel reinforcement frame further includes upper row beam structure reinforcing bars distributed laterally at intervals and lower row beam structure reinforcing bars distributed laterally at intervals. The upper row beam structure reinforcing bars are located below the main reinforcing bars of the upper row beam structure, and the lower row beam structure reinforcing bars are located above the main reinforcing bars of the lower row beam structure.

[0012] Furthermore, the present invention provides a method for treating the joint between the old and new subway station base slabs, wherein the distance between adjacent steel bars in the main reinforcement of the upper slab structure is D1, and the distance between adjacent steel bars in the main reinforcement of the lower slab structure is D2, where D1 = D2 = 12~18cm.

[0013] Furthermore, the present invention provides a method for treating the joint between the old and new subway station base slabs, wherein the distance between adjacent reinforcing bars in the upper row of slab structure reinforcing bars is D3, and the distance between adjacent reinforcing bars in the lower row of slab structure reinforcing bars is D4, where D3 = D4 = 12~18cm.

[0014] Furthermore, the present invention provides a method for treating the joint between the old and new subway station floor slabs, wherein the length of the upper and lower row of reinforcing ribs extending into the new station floor slab is L1, and L1 ≥ 300 cm.

[0015] Furthermore, the present invention provides a method for treating the joint between the old and new subway station base slabs, wherein the length of the lower row of anchor bars and the lower row of anchor reinforcing bars extending into the new station base slab is L2, L2≥120cm, the lower row of main slab structural bars and the lower row of reinforcing bars are lower than the lower row of anchor bars and the lower row of anchor reinforcing bars, and the ends of the lower row of main slab structural bars and the lower row of reinforcing bars are respectively provided with upwardly bent connecting parts.

[0016] Furthermore, the present invention provides a method for treating the joint between the old and new subway station floor slabs, wherein the upper side of the new station floor slab is flush with the upper side of the old station floor slab, the height difference between the upper side of the transition beam and the upper side of the old station floor slab is H2, H2 = 45~55cm, and the portions of the upper half of the transition beam that protrude from the lower half form flanges, the width of which is W, W ≥ 30cm.

[0017] Compared with existing technologies, the present invention provides a method for treating the joint between the old and new subway station floor slabs, which has the following advantages: The present invention employs the following steps: the diaphragm wall at the connection between the old and new stations is chiseled away from top to bottom until the height difference between the chiseled surface of the diaphragm wall and the lower side of the old station floor slab is 25-35cm; a slab structure steel reinforcement frame and a beam structure steel reinforcement frame are correspondingly set on the new station side and the upper side of the diaphragm wall, and the slab structure steel reinforcement frame is connected to the beam structure steel reinforcement frame and the anchoring steel reinforcement in the old station floor slab; concrete is poured on the beam structure steel reinforcement frame and the slab structure steel reinforcement frame to form a transition beam and the new station floor slab. The transition beam is T-shaped with the upper half wider than the lower half, and the upper half of the transition beam presses onto the old station floor slab and the new station floor slab respectively, thus constituting a method for treating the joint between the old and new subway station floor slabs. This invention involves casting a transition beam at the joint, with the upper half of the transition beam being wider than the lower half in a T-shape. The upper half of the transition beam is pressed onto the old and new station floor slabs respectively. This effectively solves the problem of water leakage at the joint between the old and new station floor slabs, and avoids deformation and cracking caused by uneven settlement on both sides of the joint. It also has the advantages of simple process, convenient implementation, high work efficiency, and safety and reliability.

[0018] The following detailed description of a method for treating the joint between the old and new subway station floor slabs according to the present invention, with reference to the accompanying drawings, illustrates the specific embodiments. Attached Figure Description

[0019] Figure 1 This is a schematic diagram showing the positional relationship between the old station base plate, the diaphragm wall, and the new station base plate in this invention;

[0020] Figure 2 This is a schematic diagram showing the steel reinforcement connection relationship between the old station base slab, transition beam, and new station base slab in this invention;

[0021] Figure 3 This is a schematic diagram of the steel reinforcement frame of the beam structure in this invention. Detailed Implementation

[0022] First, it should be noted that the directional terms such as up, down, left, right, front, and back used in this invention are merely descriptions based on the accompanying drawings for ease of understanding, and are not intended to limit the technical solution or the scope of protection claimed in this invention.

[0023] like Figures 1 to 3The present invention provides a specific embodiment of a method for treating the joint between the old and new subway station floor slabs, which includes the following steps:

[0024] S1. From top to bottom, remove the diaphragm wall 1 at the connection between the old and new stations until the height difference between the removed surface of the diaphragm wall 1 and the lower side of the old station floor slab 2 is H1, where H1 = 25-35cm. The removed surface refers to the plane formed by removing the diaphragm wall 1 from top to bottom.

[0025] S2. On the new station side and the upper side of the diaphragm wall 1, a slab structure steel reinforcement frame and a beam structure steel reinforcement frame are respectively set up, and the slab structure steel reinforcement frame is connected to the beam structure steel reinforcement frame and the anchoring steel reinforcement in the old station floor slab 2.

[0026] S3. By pouring concrete on the steel reinforcement frame of the beam structure and the steel reinforcement frame of the slab structure, a transition beam 3 and a new station base slab 4 are formed. The transition beam 3 is T-shaped with the upper half wider than the lower half. The upper half of the transition beam 3 presses on the old station base slab 2 and the new station base slab 4 respectively.

[0027] This invention provides a method for treating the joint between the old and new subway station slabs by employing the above steps. A transition beam 3 is cast at the joint, with the upper half of the transition beam 3 having a T-shaped structure where the lower half is wider than the upper half. The upper sides of the transition beam 3 are positioned to press against the old station slab 2 and the new station slab 4 respectively. This effectively solves the problem of water leakage at the joint between the old and new station slabs and avoids deformation and cracking caused by uneven settlement on both sides of the joint. Furthermore, it has the advantages of simple procedures, convenient implementation, high work efficiency, and safety and reliability. It should be noted that, depending on whether the old station base slab 2 has a pre-reserved steel bar connector, the anchoring steel bars can be installed in two ways. If the steel bar ends in the old station base slab 2 have steel bar connectors, the ends of the old station base slab 2 can be chiseled to expose the steel bar connectors, and the anchoring steel bars can be connected and fixed to the existing steel bars in the old station base slab 2 through the steel bar connectors. If the old station base slab 2 does not have steel bar connectors, the anchoring steel bars can be fixed in the old station base slab 2 by implantation. Both methods can achieve the technical purpose of this invention.

[0028] In a specific embodiment, the present invention provides a longitudinally spaced upper row of main slab reinforcement bars 51 and a longitudinally spaced lower row of main slab reinforcement bars 52. Correspondingly, the anchoring reinforcement consists of an upper row of anchoring bars 61 connected one-to-one with the upper row of main slab reinforcement bars 51 and a lower row of anchoring bars 62 connected one-to-one with the lower row of main slab reinforcement bars 52. This configuration of the slab reinforcement frame features a high degree of standardization and robust reliability. To further enhance stability and reliability, this specific embodiment also provides a longitudinally spaced upper row of reinforcing bars 53 and a longitudinally spaced lower row of reinforcing bars 54 in the slab reinforcement frame, and provides an upper row of anchoring reinforcing bars 63 connected one-to-one with the upper row of reinforcing bars 53 and a lower row of anchoring reinforcing bars 64 connected one-to-one with the lower row of reinforcing bars 54. It should be noted that, to ensure stability, the steel reinforcement frame of the slab structure also includes stirrups placed between the main reinforcement bars 51 of the upper slab structure and the main reinforcement bars 52 of the lower slab structure; the above longitudinal direction refers to the direction along the joint, and the transverse direction refers to the direction perpendicular to the joint.

[0029] In a specific embodiment, the present invention provides a beam structure reinforcement frame with transversely spaced upper row of main beam reinforcement bars 71 and transversely spaced lower row of main beam reinforcement bars 72. The overall width of the upper row of main beam reinforcement bars 71 is greater than the overall width of the lower row of main beam reinforcement bars 72. Multiple open stirrups 73 are provided between the lower row of main beam reinforcement bars 72 and the upper row of main beam reinforcement bars 71 to connect them as a whole. Simultaneously, transversely spaced middle row of main beam reinforcement bars 74 are provided on both sides of the open stirrups 73 and below the upper row of main beam reinforcement bars 71. Closed stirrups 75 are provided between the middle row of main beam reinforcement bars 74 and the upper row of main beam reinforcement bars 71 to connect them as a whole. This beam structure reinforcement frame configuration features a high degree of standardization and robust reliability. To enhance stability and reliability, this specific embodiment also provides the beam structure steel reinforcement frame with horizontally spaced upper row beam structure reinforcing bars 76 and horizontally spaced lower row beam structure reinforcing bars 77. The upper row beam structure reinforcing bars 76 are located below the upper row beam structure main bars 71, and the lower row beam structure reinforcing bars 77 are located above the lower row beam structure main bars 72.

[0030] In a specific implementation, this invention improves structural stability and standardization by setting the distance between adjacent reinforcing bars in the upper row of main reinforcing bars 51 as D1 and the distance between adjacent reinforcing bars in the lower row of main reinforcing bars 52 as D2, with D1 = D2 = 12-18 cm. Similarly, this invention sets the distance between adjacent reinforcing bars in the upper row of reinforcing bars 53 as D3 and the distance between adjacent reinforcing bars in the lower row of reinforcing bars 54 as D4, with D3 = D4 = 12-18 cm. To ensure a stable connection between the new station base slab 4 and the transition beam 3 and the old station base slab 2 at the joint, this invention sets the length of the upper row of reinforcing bars 53 and the lower row of reinforcing bars 54 extending into the new station base slab 4 as L1, with L1 ≥ 300 cm. Similarly, in this invention, the length of the lower row of anchor bars 62 and lower row of anchor reinforcing bars 64 extending into the new station base plate 4 is set to L2, and L2≥120cm. The lower row of main bars 52 and lower row of reinforcing bars 54 are lower than the lower row of anchor bars 62 and lower row of anchor reinforcing bars 64. The ends of the lower row of main bars 52 and lower row of reinforcing bars 54 are respectively provided with upwardly bent connecting parts.

[0031] In practical applications, to ensure the connection and load-bearing effect of the transition beam 3, the present invention adopts a flush arrangement between the upper side of the new station base plate 4 and the upper side of the old station base plate 2. The height difference between the upper side of the transition beam 3 and the upper side of the old station base plate 2 is set to H2, and H2 = 45~55cm. At the same time, the parts of the upper half of the transition beam 3 that protrude from the lower half form flanges 31 (the parts that press on the old station base plate 2 and the new station base plate 4). The width of the flanges 31 is set to W, and W ≥ 30cm.

[0032] The above embodiments are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Various modifications made by those skilled in the art based on the technical solutions of the present invention without departing from the design concept of the present invention should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A method for treating the joint between the old and new subway station floor slabs, characterized in that, Includes the following steps: S1. From top to bottom, the diaphragm wall (1) at the connection between the old and new stations is chiseled away until the height difference between the chiseled surface of the diaphragm wall (1) and the lower side of the old station floor slab (2) is H1, where H1 = 25-35cm. S2. On the side of the new station and on the upper side of the diaphragm wall (1), a slab structure steel frame and a beam structure steel frame are set up respectively, and the slab structure steel frame is connected to the beam structure steel frame and the anchoring steel in the old station floor slab (2). S3. By pouring concrete on the beam structure steel frame and the slab structure steel frame, a transition beam (3) and a new station base plate (4) are formed. The transition beam (3) is T-shaped with the upper half wider than the lower half. The upper half of the transition beam (3) presses on the old station base plate (2) and the new station base plate (4) respectively.

2. The method for treating the joint between the old and new subway station floor slabs according to claim 1, characterized in that, The slab structure steel reinforcement frame includes an upper row of slab structure main reinforcement bars (51) and a lower row of slab structure main reinforcement bars (52) distributed longitudinally at intervals. The anchoring reinforcement bars include an upper row of anchoring bars (61) that are connected one-to-one with the upper row of slab structure main reinforcement bars (51) and a lower row of anchoring bars (62) that are connected one-to-one with the lower row of slab structure main reinforcement bars (52).

3. The method for treating the joint between the old and new subway station floor slabs according to claim 2, characterized in that, The slab structure steel reinforcement frame also includes an upper row of slab structure reinforcing bars (53) and a lower row of slab structure reinforcing bars (54) distributed longitudinally at intervals. The anchoring reinforcement also includes an upper row of anchoring reinforcing bars (63) that are connected one-to-one with the upper row of slab structure reinforcing bars (53) and a lower row of anchoring reinforcing bars (64) that are connected one-to-one with the lower row of slab structure reinforcing bars (54).

4. The method for treating the joint between the old and new subway station floor slabs according to claim 3, characterized in that, The beam structure steel reinforcement frame includes upper row main reinforcement bars (71) and lower row main reinforcement bars (72) distributed laterally. The overall width of the upper row main reinforcement bars (71) is greater than the overall width of the lower row main reinforcement bars (72). Multiple open stirrups (73) are provided between the lower row main reinforcement bars (72) and the upper row main reinforcement bars (71). On both sides of the open stirrups (73) and below the upper row main reinforcement bars (71), there are also middle row main reinforcement bars (74) distributed laterally. Closed stirrups (75) are provided between the middle row main reinforcement bars (74) and the upper row main reinforcement bars (71).

5. A method for treating the joint between the old and new subway station floor slabs according to claim 4, characterized in that, The beam structure steel reinforcement frame also includes horizontally spaced upper beam structure reinforcing bars (76) and horizontally spaced lower beam structure reinforcing bars (77). The upper beam structure reinforcing bars (76) are located below the upper beam structure main bars (71), and the lower beam structure reinforcing bars (77) are located above the lower beam structure main bars (72).

6. A method for treating the joint between the old and new subway station floor slabs according to claim 5, characterized in that, The distance between adjacent steel bars in the upper row of slab structure main reinforcement (51) is D1, and the distance between adjacent steel bars in the lower row of slab structure main reinforcement (52) is D2, where D1 = D2 = 12 ~ 18 cm.

7. A method for treating the joint between the old and new subway station floor slabs according to claim 5, characterized in that, The distance between adjacent reinforcing bars in the upper row of slab structure reinforcing bars (53) is D3, and the distance between adjacent reinforcing bars in the lower row of slab structure reinforcing bars (54) is D4, where D3 = D4 = 12 ~ 18 cm.

8. A method for treating the joint between the old and new subway station floor slabs according to claim 5, characterized in that, The length of the upper row of reinforcing ribs (53) and the lower row of reinforcing ribs (54) extending into the new station base plate (4) is L1, where L1 ≥ 300 cm.

9. A method for treating the joint between the old and new subway station floor slabs according to claim 5, characterized in that, The length of the lower row of anchor bars (62) and lower row of anchor reinforcing bars (64) extending into the new station base plate (4) is L2, L2≥120cm. The lower row of main bars (52) and lower row of reinforcing bars (54) are lower than the lower row of anchor bars (62) and lower row of anchor reinforcing bars (64). The ends of the lower row of main bars (52) and lower row of reinforcing bars (54) are respectively provided with upwardly bent connecting parts.

10. A method for treating the joint between the old and new subway station floor slabs according to claim 5, characterized in that, The upper side of the new station base plate (4) is flush with the upper side of the old station base plate (2). The height difference between the upper side of the transition beam (3) and the upper side of the old station base plate (2) is H2, where H2 = 45-55cm. The upper half of the transition beam (3) protrudes from the lower half to form a flange (31), and the width of the flange (31) is W, where W ≥ 30cm.

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