Auxiliary trolley and underground pipe gallery box type inner mold mounting and dismounting construction method

Abstract

The invention relates to the technical field of underground pipe gallery construction, and particularly discloses an auxiliary trolley and an underground pipe gallery box type inner mold mounting and dismounting method. The trolley comprises a trolley body, the trolley body comprises a rectangular mounting frame, a reinforcing frame is arranged in the mounting frame, and walking wheels are arranged at the bottom of the reinforcing frame; jacking mechanisms located on the two sides of the reinforcing frame are further arranged in the mounting frame and used for pushing the trolley body to ascend. The construction method comprises the steps that S1, a foundation is poured; s2, a bearing platform is installed; s3, mounting an inner mold; s4, concrete pouring; s5, removing the mold; the internal mold does not need to be lifted in the process of mounting and dismounting the internal mold, so that the internal mold is prevented from shaking or toppling over in the process of mounting and dismounting, and safety threats to constructors are avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of underground pipe gallery construction, in particular to an auxiliary trolley and a box-type inner form installation and removal method for underground pipe gallery. BACKGROUND

[0002] In the development of urban underground space, the comprehensive pipe gallery is a public tunnel for laying various municipal pipelines such as power, communication, water supply and drainage, and its construction scale is expanding. At present, the cast-in-place concrete pipe gallery is one of the main construction forms, and its construction process usually relies on a formwork system to shape the internal structure and size of the pipe gallery.

[0003] In the prior art, the installation and removal of the pipe gallery inner form are mostly completed by large lifting equipment and manual cooperation. Specifically, the hoisting, positioning, adjustment, and subsequent removal and transportation of the inner form require frequent use of cranes and other heavy machinery, and have the following significant defects: the movement, positioning and demolding of the inner form completely rely on external lifting equipment, the process connection is complex, the mechanical equipment is occupied for a long time, the single cycle operation period is long, and the overall construction progress is slow; the inner form has large volume and weight, and is unstable during installation, especially during demolding, and is prone to shaking or falling, which poses a safety threat to construction personnel. SUMMARY

[0004] The present application provides an auxiliary trolley and a box-type inner form installation and removal method for underground pipe gallery, which can overcome some or some defects of the prior art.

[0005] According to the auxiliary trolley of the present application, the trolley body includes a rectangular-shaped installation frame, a reinforcing frame is arranged inside the installation frame, walking wheels are arranged at the bottom of the reinforcing frame; a jacking mechanism is further arranged inside the installation frame and located on both sides of the reinforcing frame, and the jacking mechanism is used to push the trolley body upwards.

[0006] According to this invention, during the construction of the pipe gallery, the foundation is first poured and steel mesh is tied at both ends. Then, construction workers use a crane to lift the main body of the trolley to one end of the foundation, and then lift the left and right inner molds onto the trolley. Next, the second motor is started, driving the wheels to move the trolley to the designated location. Then, construction workers use jacks to push the left and right inner molds towards and against the steel mesh. A support frame is then installed between the left and right inner molds to fix them in place. Finally, the second hydraulic cylinder is activated to lift the trolley... After lifting and moving the left and right inner molds to the designated positions, support rods are installed below the left and right inner molds to support them. Then, the construction workers activate the second hydraulic cylinder to lower the height of the trolley, and then activate the second motor to drive the traveling wheels to detach the trolley from the left and right inner molds. After the trolley is detached from the left and right inner molds, the top plate is installed on the top of the left and right inner molds and the outer templates are installed on both sides of the left and right inner molds. Finally, the above operation is repeated to install another inner mold. Adjacent inner molds are fastened together with positioning pins and screws. After all the inner and outer molds are installed, concrete is poured. After the pouring is completed, move the trolley to the bottom of the left and right inner molds. First, remove the positioning pins and screws to disconnect the connection between the adjacent inner molds. Then, start the second hydraulic cylinder to lift the trolley to the bottom of the inner mold. Then, loosen the support rod under the inner mold so that the inner mold is mounted on the trolley. Then, the construction workers stand on the support plate of the trolley and remove the support frame connecting the left and right inner molds. Then, use jacks to pull the left and right inner molds towards the middle so that the left and right inner molds are separated from the side walls of the pipe rack. After that, start the second hydraulic cylinder to lower the height of the trolley so that the inner mold is separated from the top wall of the pipe rack. Finally, the trolley transports the inner mold away. Repeat the above operation to remove all the inner molds. The installation and removal of the inner formwork rarely relies on heavy machinery such as cranes, thus reducing equipment costs. Furthermore, the installation and removal of the inner formwork are carried out inside the pipe gallery by construction personnel and trolleys, and are not affected by external equipment due to the movement of equipment, which greatly improves the efficiency of the installation and removal of the inner formwork. In addition, there is no need to lift the inner formwork during the installation and removal process, which avoids the inner formwork shaking or tipping during the lifting process and posing a safety threat to the construction personnel.

[0007] Preferably, the lifting mechanism includes a first reinforcing plate arranged along the width of the mounting frame, with a second hydraulic cylinder at each end of the first reinforcing plate, and a support foot connected to the second hydraulic cylinder below the second hydraulic cylinder.

[0008] With this invention, the support foot is connected to the hydraulic rod of the second hydraulic cylinder and contacts the bottom surface, thereby preventing the hydraulic rod from contacting the bottom surface and thus damaging the hydraulic rod.

[0009] As preferred, the first reinforcing plate is provided with a second reinforcing plate away from one side of the mounting frame, the second reinforcing plate and the mounting frame jointly form a first limiting interval, a double-rod hydraulic cylinder is arranged in the first limiting interval, a hydraulic rod of the double-rod hydraulic cylinder penetrates through the mounting frame, and a guide wheel is arranged at one end of the hydraulic rod penetrating through the mounting frame.

[0010] Through the application, the double-rod hydraulic cylinder abuts the guide wheel against the lower sidewall of the pipe gallery during movement of the trolley, so that the trolley can move stably.

[0011] As preferred, the reinforcing frame comprises a bottom plate connected with the mounting frame, a third reinforcing plate is arranged above the bottom plate and along the length direction of the bottom plate, fourth reinforcing plates and fifth reinforcing plates are arranged at both ends of the third reinforcing plate and spaced along the length direction of the third reinforcing plate, and the third reinforcing plate, the fourth reinforcing plates, the fifth reinforcing plates and the bottom plate jointly form a second limiting interval, a second motor for driving the walking wheels to rotate is arranged in the second limiting interval.

[0012] Through the application, the fourth reinforcing plates and the fifth reinforcing plates are respectively welded between both ends of the fourth reinforcing plates and the fifth reinforcing plates and the inner sidewall of the mounting frame, and the sidewall of the bottom plate is welded between the sidewall of the bottom plate and the inner sidewall of the mounting frame; the reinforcing frame preferably improves the structural strength of the trolley as a whole. The fourth reinforcing plates, the fifth reinforcing plates, the first reinforcing plate and the second reinforcing plate are respectively provided with first holes, second holes, third holes and fourth holes for the lines to penetrate, so as to facilitate the lines to penetrate through the fourth reinforcing plates, the fifth reinforcing plates, the first reinforcing plate and the second reinforcing plate and be connected with the second hydraulic cylinder and the second motor.

[0013] The third reinforcing plate and the fourth reinforcing plates, the fifth reinforcing plates and the bottom plate jointly form a plurality of storage grooves for preventing construction tools such as the jacks, the positioning pins, the screws, the supporting rods and the supporting frames.

[0014] As preferred, the fourth reinforcing plate is provided with mounting grooves at both ends, and first rollers are arranged in the mounting grooves.

[0015] The fourth reinforcing plate is provided with connecting blocks connected with the mounting frame at both ends, and second rollers are arranged at the connecting blocks.

[0016] Through the application, when the left and right inner molds are on the trolley, the bottom surfaces are pressed on the first rollers and the second rollers, so that the left and right inner molds are facilitated to slide on the trolley when the construction personnel gather or separate the left and right inner molds by using the jacks, and the friction between the left and right inner molds and the trolley is reduced.

[0017] As preferred, a supporting plate is arranged above the reinforcing frame.

[0018] Through the application, the supporting plate facilitates the construction personnel to stand on the trolley, and facilitates the installation and removal of the supporting rods and the supporting frames.

[0019] This invention provides a method for installing and dismantling the inner formwork of an underground utility tunnel box, implemented by the aforementioned auxiliary trolley. The steps are as follows. S1, Pouring the foundation The foundation is poured along the length of the pipe gallery. After the foundation is poured, a concrete base is poured on top of the foundation along the length of the foundation. After the base is poured, a steel cage is fixed on top of the base. S2, Foundation Installation A foundation is installed at one end of the utility tunnel. The foundation is made of I-beams and square tubes. The position and spacing of the I-beams are synchronized with the wheels of the auxiliary trolley. The installation height of the foundation is the same as the thickness of the utility tunnel foundation. After the foundation is installed, the auxiliary trolley is hoisted onto the foundation. S3, Inner mold installation After the auxiliary trolley is placed, a crane is used to lower the two inner molds on the left and right onto the auxiliary trolley. Then, the auxiliary trolley is driven to move to the other end of the foundation. The jacking mechanism is then used to lift the auxiliary trolley so that the inner molds meet the height of the pipe gallery. A support frame is then connected between the two inner molds to fix them in place. Support rods are then installed under the two inner molds to support them. After the support frame and support rods are installed, the height of the auxiliary trolley is lowered using the jacking mechanism. Finally, the trolley is driven to detach from the inner mold to complete the installation of the next inner mold. After all the inner molds are installed, adjacent inner molds are fastened together with positioning pins and screws. S4, Concrete Pouring After the inner formwork is installed, the top reinforcement bars of the inner formwork are tied. After the reinforcement bars are tied, concrete is poured to form the pipe gallery. S5, Demolding After the concrete has solidified, the auxiliary trolley is moved to the bottom of the inner formwork, and the lifting mechanism is activated to lift the auxiliary trolley and press it against the bottom of the inner formwork. Then, the construction workers remove the positioning pins and screws between the adjacent inner formswork, the support frame between the two inner formswork, and the support rods under the inner formswork in sequence. Then, the height of the auxiliary trolley is lowered by the lifting mechanism to detach the inner formswork from the top of the pipe rack. The two inner formswork on the left and right are pulled together by the hydraulic press to detach the inner formswork from the side wall of the pipe rack. Finally, the auxiliary trolley is driven to transport the inner formswork out of the pipe rack.

[0020] This invention uses an auxiliary trolley as the core platform to achieve a streamlined operation of transporting, lifting, positioning, and demolding the inner mold. Once the trolley is in place, multiple subsequent steps can be completed continuously on it, avoiding the intermittent downtime of cranes in traditional methods, which involve lifting, waiting, and then lifting again, thereby shortening the cycle time of a single operation.

[0021] Preferably, in step S3, after the auxiliary trolley is lifted by the lifting mechanism, the elevation and axis are checked.

[0022] With this invention, the clearance height, slope, and subsequent interface positions with other pipelines of the utility tunnel are directly determined by the installation height of the inner formwork. After fine-tuning to the design elevation using a lifting mechanism, immediate verification ensures the accuracy of the height of each section of the utility tunnel, guaranteeing a smooth linear tunnel and meeting functional requirements.

[0023] Preferably, in step S5, when the hydraulic press pulls the two inner molds on the left and right sides toward the center, the movement should be synchronized and at a constant speed.

[0024] This invention addresses the issue that if one side of the inner mold moves first while the other lags behind, uneven stress distribution occurs on both sides of the concrete structure. The stress on the side that detaches first is released instantly, while the other side remains stuck. This uneven force can easily cause stress concentration at concrete corners or joints, leading to surface cracking, fissures, and even edge damage. Synchronous movement ensures a uniform distribution of demolding force, allowing the inner mold to slide out smoothly. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the main body of the vehicle in Example 1.

[0026] Figure 2 This is a schematic diagram of the bottom surface of the main body of the trolley in Example 1.

[0027] Figure 3 This is a schematic diagram of the second hydraulic cylinder in Example 1.

[0028] Figure 4 This is a schematic diagram of the double-rod hydraulic cylinder in Example 1.

[0029] Figure 5 This is a schematic diagram of the reinforcement frame in Example 1.

[0030] Figure 6 This is a schematic diagram of the trolley's construction status in Example 1. Detailed Implementation

[0031] To further understand the content of this invention, the invention will be described in detail with reference to the embodiments. It should be understood that the embodiments are merely illustrative and not limiting of the invention.

[0032] Example 1 like Figures 1-6 As shown, this embodiment provides an auxiliary trolley, including a trolley body 700. The trolley body 700 includes a rectangular mounting frame 710. The mounting frame 710 has a reinforcing frame 770 inside and a traveling wheel 810 at the bottom. The mounting frame 710 also has a lifting mechanism located on both sides of the reinforcing frame 770. The lifting mechanism is used to push the trolley body 700 up.

[0033] In this embodiment, during the construction of the pipe gallery, the foundation is first poured and steel mesh is tied at both ends. Then, workers use a crane to lift the main body 700 of the trolley to one end of the foundation. Next, the left and right inner molds are lifted onto the trolley main body 700. The second motor 1108 is then started, driving the traveling wheels 810 to move the trolley to the designated location. Workers then use jacks to push the left and right inner molds towards and against the steel mesh. A support frame is then installed between the left and right inner molds to secure them. Finally, the second hydraulic cylinder 92 is activated. 0. After lifting the trolley and moving the left and right inner molds to the designated positions, install support rods under the left and right inner molds to support them. Then, the construction workers start the second hydraulic cylinder 920 to lower the height of the trolley, and start the second motor 1108 to drive the traveling wheels 810 to detach the trolley from the left and right inner molds. After the trolley is detached from the left and right inner molds, install the top plate on the top of the left and right inner molds and install the outer templates on both sides of the left and right inner molds. Finally, repeat the above operation to install another inner mold. Adjacent inner molds are fastened together with positioning pins and screws. After all inner and outer molds are installed, pour concrete. After the pouring is completed, move the trolley to the bottom of the left and right inner molds. First, remove the positioning pins and screws to disconnect the connection between the adjacent inner molds. Then, start the second hydraulic cylinder 920 to lift the trolley to the bottom of the inner mold. Then, loosen the support rod under the inner mold so that the inner mold is mounted on the trolley. Then, the construction workers stand on the support plate 760 of the trolley and remove the support frame connecting the left and right inner molds. Then, use jacks to pull the left and right inner molds towards the middle so that the left and right inner molds are separated from the side walls of the pipe rack. After that, start the second hydraulic cylinder 920 to lower the height of the trolley so that the inner mold is separated from the top wall of the pipe rack. Finally, the trolley transports the inner mold away. Repeat the above operation to remove all the inner molds. The installation and removal of the inner formwork rarely relies on heavy machinery such as cranes, thus reducing equipment costs. Furthermore, the installation and removal of the inner formwork are carried out inside the pipe gallery by construction personnel and trolleys, and are not affected by external equipment due to the movement of equipment, which greatly improves the efficiency of the installation and removal of the inner formwork. In addition, there is no need to lift the inner formwork during the installation and removal process, which avoids the inner formwork shaking or tipping during the lifting process and posing a safety threat to the construction personnel.

[0034] In this embodiment, the lifting mechanism includes a first reinforcing plate 740 arranged along the width direction of the mounting frame 710. Both ends of the first reinforcing plate 740 are provided with second hydraulic cylinders 920, and a support foot 930 connected to the second hydraulic cylinder 920 is provided below the second hydraulic cylinder 920.

[0035] In this embodiment, the support foot 930 is connected to the hydraulic rod of the second hydraulic cylinder 920 and contacts the bottom surface, thereby preventing the hydraulic rod from contacting the bottom surface and thus damaging the hydraulic rod.

[0036] In this embodiment, a second reinforcing plate 720 is provided on the side of the first reinforcing plate 740 away from the mounting frame 710. The second reinforcing plate 720 and the mounting frame 710 together form a first limiting interval 790. A double-rod hydraulic cylinder 1001 is provided in the first limiting interval 790. The hydraulic rod of the double-rod hydraulic cylinder 1001 passes through the mounting frame 710, and a guide wheel 730 is provided at one end of the hydraulic rod passing through the mounting frame 710.

[0037] In this embodiment, during the movement of the trolley, the double-rod hydraulic cylinder 1001 presses the guide wheel 730 against the lower side wall of the pipe rack, enabling the trolley to move stably.

[0038] In this embodiment, the reinforcing frame 770 includes a base plate 750 connected to the mounting frame 710. Above the base plate 750, there are two third reinforcing plates 1109 arranged along the length of the base plate 750. At both ends of the third reinforcing plates 1109, there are fourth reinforcing plates 1104 and fifth reinforcing plates 1102 arranged at intervals along the length of the third reinforcing plates 1109. The third reinforcing plates 1109, fourth reinforcing plates 1104, fifth reinforcing plates 1102 and the base plate 750 together constitute a second limiting interval. A second motor 1108 for driving the walking wheel 810 to rotate is provided in the second limiting interval.

[0039] In this embodiment, the fourth reinforcing plate 1104 and the fifth reinforcing plate 1102 are welded to the inner wall of the mounting frame 710 at both ends, and the side wall of the bottom plate 750 is welded to the inner wall of the mounting frame 710; the reinforcing frame 770 effectively improves the overall structural strength of the trolley. The fourth reinforcing plate 1104, the fifth reinforcing plate 1102, the first reinforcing plate 740, and the second reinforcing plate 720 are respectively provided with a first hole 1103, a second hole 1101, a third hole 910, and a fourth hole 1002 for the line to pass through, thereby facilitating the line to pass through the fourth reinforcing plate 1104, the fifth reinforcing plate 1102, the first reinforcing plate 740, and the second reinforcing plate 720 and connect with the second hydraulic cylinder 920 and the second motor 1108.

[0040] The third reinforcing plate 1109, the fourth reinforcing plate 1104, the fifth reinforcing plate 1102, and the base plate 750 form multiple storage slots. These storage slots are used to prevent the use of construction tools such as jacks, positioning pins, screws, support rods, and support frames.

[0041] In this embodiment, the fourth reinforcing plate 1104 has mounting grooves 1106 at both ends, and the mounting grooves 1106 are provided with first rollers 1107.

[0042] The fourth reinforcing plate 1104 has connecting blocks 701 at both ends that are connected to the mounting frame 710, and a second roller 702 is provided at the connecting block 701.

[0043] In this embodiment, when the left and right inner molds are on the trolley, their bottom surfaces press against the first roller 1107 and the second roller 702, which makes it convenient for construction workers to use jacks to gather or separate the left and right inner molds, and also allows the left and right inner molds to slide on the trolley, thus reducing the friction between the left and right inner molds and the trolley.

[0044] In this embodiment, a support plate 760 is provided above the reinforcing frame 770.

[0045] In this embodiment, the support plate 760 facilitates construction workers to stand on the trolley and install and remove the support rods and support frames.

[0046] This embodiment provides a method for installing and dismantling the inner formwork of an underground utility tunnel box, implemented by the aforementioned auxiliary trolley. The steps are as follows. S1, Pouring the foundation The foundation is poured along the length of the pipe gallery. After the foundation is poured, a concrete base is poured on top of the foundation along the length of the foundation. After the base is poured, a steel cage is fixed on top of the base. S2, Foundation Installation A foundation is installed at one end of the utility tunnel. The foundation is made of I-beams and square tubes. The position and spacing of the I-beams are synchronized with the traveling wheels 810 of the auxiliary trolley. The installation height of the foundation is the same as the thickness of the utility tunnel foundation. After the foundation is installed, the auxiliary trolley is hoisted onto the foundation. S3, Inner mold installation After the auxiliary trolley is placed, a crane is used to lower the two inner molds on the left and right onto the auxiliary trolley. Then, the auxiliary trolley is driven to move to the other end of the foundation. The jacking mechanism is then used to lift the auxiliary trolley so that the inner molds meet the height of the pipe gallery. A support frame is then connected between the two inner molds to fix them in place. Support rods are then installed under the two inner molds to support them. After the support frame and support rods are installed, the height of the auxiliary trolley is lowered using the jacking mechanism. Finally, the trolley is driven to detach from the inner mold to complete the installation of the next inner mold. After all the inner molds are installed, adjacent inner molds are fastened together with positioning pins and screws. S4, Concrete Pouring After the inner formwork is installed, the top reinforcement bars of the inner formwork are tied. After the reinforcement bars are tied, concrete is poured to form the pipe gallery. S5, Demolding After the concrete has solidified, the auxiliary trolley is moved to the bottom of the inner formwork, and the lifting mechanism is activated to lift the auxiliary trolley and press it against the bottom of the inner formwork. Then, the construction workers remove the positioning pins and screws between the adjacent inner formswork, the support frame between the two inner formswork, and the support rods under the inner formswork in sequence. Then, the height of the auxiliary trolley is lowered by the lifting mechanism to detach the inner formswork from the top of the pipe rack. The two inner formswork on the left and right are pulled together by the hydraulic press to detach the inner formswork from the side wall of the pipe rack. Finally, the auxiliary trolley is driven to transport the inner formswork out of the pipe rack.

[0047] In this embodiment, the auxiliary trolley is used as the core platform to realize the "assembly line" operation of transporting, lifting, positioning and demolding of the inner mold. Once the trolley is in place, multiple subsequent steps can be completed continuously on it, avoiding the intermittent downtime of the crane in the traditional method, which involves lifting, waiting and then lifting again, thereby shortening the single operation cycle time.

[0048] In this embodiment, in step S3, after the auxiliary trolley is lifted by the lifting mechanism, the elevation and axis are checked.

[0049] In this embodiment, the clearance height, slope, and subsequent interface positions with other pipelines of the utility tunnel are directly determined by the installation height of the inner formwork. After fine-tuning to the design elevation using a lifting mechanism, immediate verification ensures the accuracy of the height of each section of the utility tunnel, guaranteeing a smooth linear tunnel and meeting functional requirements.

[0050] In this embodiment, when the hydraulic press pulls the two inner molds on the left and right sides toward the middle in step S5, it needs to be done synchronously and at a constant speed.

[0051] In this embodiment, if one side of the inner mold moves first while the other side lags behind, it will cause uneven stress on both sides of the concrete gallery. The stress on the side that detaches first is released instantly, while the other side is still stuck. This uneven force can easily cause stress concentration at the corners or joints of the concrete, leading to cracks and even edge damage on the concrete surface. Synchronous movement ensures a uniform distribution of demolding force, allowing the inner mold to slide out smoothly.

[0052] It is readily understood that those skilled in the art can combine, split, or reorganize the embodiments provided in this application to obtain other embodiments, all of which do not exceed the protection scope of this application.

[0053] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the embodiments shown are only part of the embodiments of the present invention. The actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. An auxiliary trolley, characterized in that: The device includes a trolley body (700), which includes a rectangular mounting frame (710). The mounting frame (710) has a reinforcing frame (770) inside and a traveling wheel (810) at the bottom of the reinforcing frame (770). The mounting frame (710) also has a lifting mechanism located on both sides of the reinforcing frame (770) inside, which is used to push the trolley body (700) up.

2. The auxiliary trolley according to claim 1, characterized in that: The lifting mechanism includes a first reinforcing plate (740) arranged along the width direction of the mounting frame (710), and a second hydraulic cylinder (920) is provided at both ends of the first reinforcing plate (740). A support foot (930) connected to the second hydraulic cylinder (920) is provided below the second hydraulic cylinder (920).

3. The auxiliary trolley according to claim 2, characterized in that: A second reinforcing plate (720) is provided on the side of the first reinforcing plate (740) away from the mounting frame (710). The second reinforcing plate (720) and the mounting frame (710) together form a first limiting interval (790). A double-rod hydraulic cylinder (1001) is provided in the first limiting interval (790). The hydraulic rod of the double-rod hydraulic cylinder (1001) passes through the mounting frame (710). A guide wheel (730) is provided at one end of the hydraulic rod that passes through the mounting frame (710).

4. An auxiliary trolley according to claim 3, characterized in that: The reinforcement frame (770) includes a base plate (750) connected to the mounting frame (710). Above the base plate (750) are two third reinforcement plates (1109) arranged along the length of the base plate (750). At both ends of the third reinforcement plates (1109) are fourth reinforcement plates (1104) and fifth reinforcement plates (1102) spaced apart along the length of the third reinforcement plates (1109). The third reinforcement plates (1109), fourth reinforcement plates (1104), fifth reinforcement plates (1102) and base plate (750) together constitute a second limiting interval. A second motor (1108) for driving the walking wheels (810) to rotate is provided in the second limiting interval.

5. An auxiliary trolley according to claim 4, characterized in that: The fourth reinforcing plate (1104) has mounting grooves (1106) at both ends, and the mounting grooves (1106) are equipped with first rollers (1107).

6. An auxiliary trolley according to claim 5, characterized in that: The fourth reinforcing plate (1104) has connecting blocks (701) at both ends that are connected to the mounting frame (710), and a second roller (702) is provided at the connecting block (701).

7. An auxiliary trolley according to claim 6, characterized in that: A support plate (760) is provided above the reinforcement frame (770).

8. A method for installing and dismantling the inner formwork of an underground utility tunnel box, implemented by an auxiliary trolley as described in any one of claims 1-7, comprising the following steps: S1, Pouring the foundation The foundation is poured along the length of the pipe gallery. After the foundation is poured, a concrete base is poured on top of the foundation along the length of the foundation. After the base is poured, a steel cage is fixed on top of the base. S2, Foundation Installation Install a foundation at one end of the pipe gallery. The foundation is made of I-beams and square tubes. The position and spacing of the I-beams are synchronized with the traveling wheels (810) of the auxiliary trolley. The installation height of the foundation is the same as the thickness of the pipe gallery foundation. After the foundation is installed, the auxiliary trolley is hoisted onto the foundation. S3, Inner mold installation After the auxiliary trolley is placed, a crane is used to lower the two inner molds on the left and right onto the auxiliary trolley. Then, the auxiliary trolley is driven to move to the other end of the foundation. The jacking mechanism is then used to lift the auxiliary trolley so that the inner molds meet the height of the pipe gallery. A support frame is then connected between the two inner molds to fix them in place. Support rods are then installed under the two inner molds to support them. After the support frame and support rods are installed, the height of the auxiliary trolley is lowered using the jacking mechanism. Finally, the trolley is driven to detach from the inner mold to complete the installation of the next inner mold. After all the inner molds are installed, adjacent inner molds are fastened together with positioning pins and screws. S4, Concrete Pouring After the inner formwork is installed, the top reinforcement bars of the inner formwork are tied. After the reinforcement bars are tied, concrete is poured to form the pipe gallery. S5, Demolding After the concrete has solidified, the auxiliary trolley is moved to the bottom of the inner formwork, and the lifting mechanism is activated to lift the auxiliary trolley and press it against the bottom of the inner formwork. Then, the construction workers remove the positioning pins and screws between the adjacent inner formswork, the support frame between the two inner formswork, and the support rods under the inner formswork in sequence. Then, the height of the auxiliary trolley is lowered by the lifting mechanism to detach the inner formswork from the top of the pipe rack. The two inner formswork on the left and right are pulled together by the hydraulic press to detach the inner formswork from the side wall of the pipe rack. Finally, the auxiliary trolley is driven to transport the inner formswork out of the pipe rack.

9. The method for installing and dismantling the inner formwork of an underground utility tunnel box as described in claim 8, characterized in that: In step S3, after the auxiliary trolley is lifted by the lifting mechanism, the elevation and axis are checked.

10. The method for installing and dismantling the inner formwork of an underground utility tunnel according to claim 8, characterized in that: In step S5, when the hydraulic press pulls the two inner molds on the left and right sides toward the middle, it must be done synchronously and at a constant speed.

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